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By Bruce R. Doe

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Published through the yank Geophysical Union as a part of the Field journey Guidebooks Series.

This afternoon journey in downtown Washington, D.C., will let examine of pollutants, structural, and other forms of wear and tear to constructions with emphasis on these developed of good- to coarse-grained marble yet with representatives of limestone and crimson sandstone. The travel will contain so as of exam [date of labor initiated (i) and/or occupied (o.) and stone type]: the Renwick Museum (1859o., crimson sandstone trim changed 1987), Corcoran Museum (1879c. enlarged 1927, coarse-grained marble), pink go structures (1915i.-1917o., 1927i., fine-grained marble), Memorial Continental corridor of the Daughters of the yankee Revolution, DAR (1904i.-1909o., fine-grained marble), Pan American Union development (1908i.-1910o., coarse-grained marble), structure corridor (DAR) (1929o., limestone), Washington Monument (1885o., marble), Jefferson Memorial (1943o., external of fine-grained marble), and Lincoln Memorial (1922o., very fine-grained marble). Coarse-grained marble is generally extra immune to toxins harm than fine-grained marble. Direct publicity to the weather speeds up degradation. the main serious toxins harm happens to balustrades and columns: runoff from bronze onto fine-grained marble may also reason critical degradation. Any kind of overhang has a tendency to guard the underlying stone, yet exceptions can be noticeable on the Jefferson Memorial. usually, vertical partitions have much less pollutants harm than horizontal surfaces that can start to convey roughening inside years of set up. Limestone in universal use is strangely proof against degradation owing, not less than partially, to the porous nature of the stone that inhibits runoff. If one of many journeys is made to the Powell development of the U.S. Geological Survey in Reston, Virginia (1974o., concrete), it will likely be obvious that concrete behaves very like limestone and marble.

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Gordon, 1944, pp. - Stock, 1965, p. 22 (list, key). Material examined. NZOI: A625 (one male). Vema: V-18-36 (one male). Eltanin: 6-412 (one female, onejuvenile), 7-534 (one female), 9-709 (one female), 9-735 (one specimen),25371 (one male), 32-2113 (two males, four females). InternationalWeddell SeaOceanographic Expedition, Glacier: cr 2, sta. 022 (one male). PYCNOGONIDA 43 scapeslongerthanproboscis,chelaesmallin relationto trunk and neck size, with 16 (movable) and 18 (immovable) teeth. Palp segments4 + 5 subequalto third, armed distally with many short setae.

N. femorale Fage Femur with dorsodistalspur, first tibia the longestleg segment,femur and tibiae withoutlong spinesor setae, claw slightly more than half propodallength; oviger terminal claw with 5 teeth 17. N. residuum Stock Palp segments4 + 5 equalto or longerthan 3rd seg- ..... N. hamatum Hock Femur lacking dorsodistalspur, second tibia longest, femur and first tibia with few very long setae,claw much lessthanhalf propodallength;ovigerterminalclaw with 25 slender teeth ..... *N. 3 propodallength;legs with many spines .

Second coxae and femur, and the first coxae lack the Palpswith fieldsof tiny setulesmixedwith few larger short slendertuberclefound on thoseof the new spedistal setae, increasingin numberson distal segments. cies. Finally, the tarsusis shorterthan the propodusin (holotype,USNM 234677)). Other material: sta. "LGO 51 ", no other information 30 BIOLOGY OF THE ANTARCTIC SEAS XXIV A Fig. 8. Nymphon trituberculum, newspecies, holotype: (a) trunk,dorsalview;(b) palp;(c) chela, enlarged;(d) oviger;(e) strigilisand denticulate spine,enlarged;(f) thirdleg, with distalleg segments,enlarged.

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