2U 



NEW GENKKA AND SI'ECIES OV (MUHS UATHBUN. 



'^riic median spines piosent in adiill iiiales hci-oiiie luhenailatc in 

 leiiiak's aiul smaller specimens, and llie <;asl rie tnlxucle is often absent. 

 Length of carapace 1 lA; widlli I'J niillimeteis. 

 (5uir of Califoinia ; V. S, i>'isli ( 'onnnission steamer Allxttntss, l.SSO: 



station. 



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Fatlioins. 



14 

 29 

 7 

 II 

 UU 

 20 



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18 

 20 



BoUiiiii. 



sy. S. l.rk. Sli 



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W.S. l.k. S|i 



W- S. l>k. Sp 



liic. {iy. S. brk. Sli. 



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lui. M 



fiv. M 



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Tempera- ,, . j^ 

 lure. '-at -NO. 



Gli. 1 



04 



03. 8 

 03.5 

 05.2 



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 I7:u(i 

 17347 

 17348 

 1734!) 

 17350 

 17351 

 17352 

 17353 



l"\imilv I'AirniENonD.K. 



Siihlaiuily rAirniKNoiMN.K. 

 Lanibrus (Parthenolambiiis) exilipes. 



Cara])ace about one-tliird broader llian hm^; narrow at the liei>ati(! 

 regions, spreadin.u' at tin' braiicliial regions; a «'a\'ity near the margin 

 between tlie l)rancliial and the small hei»ati<' region; a large ca\ity 

 between llie Inaniddal and the cardiac and gastric regions. Median 

 tubercles four, (me large on the posterior portion of vhe gastric region, 

 one small on the genital, one larg*' on tlnM-ardiac, and one small on the 

 intestinal. There is a prominent tnbercl*' at the siimmitof the branchial 

 region, also a few low tubercles on the branchial region ami on the 

 gastric^ ridges leading to (he rostrum. A ntero lateral margin con\e\, 

 about eight-toothed; teeth denticulate, l)ecoining smaller anteriorly, 

 till' row continued (»u the subhepatic region; tooth aI the lati'ial angle 

 thelarg«'st. iNtsteio lateral margin c(mca\c. arched u|>ward, with ti\e 

 small teeth and a large u|>tnrn((l spine al the summit ot tiiearch. 

 l*osteri(U' margin sligidly c(m\c\, tuberculale. The sujuaorbilal arch 

 bears a luom incut tnlierclc. b'ostrumchanneled, siibt riaugulate, detlexed 

 at an angle of alxml !."► '. Male abdomen with sc\ en segments. Ster- 

 num, altdoiuen, and merus of extcniai ma\illipeds tnbercidatc. ("heli- 

 peds long, irregularly dentate on t he margins, teeth dent i(Milate, a stout 

 loot lion the lower side of the liist Joint; faces of mcrus with tubercles 

 arranged more or less longitudinally; hand w ith adistiuct ridge on the 

 lower face, (uiter face s(unewhat t ubcrciihms, inner face smooth ; dactyl 

 dentate on thcontside ncai t he l»ase: b(»th lingei's <lenlate(m ])reheusile 

 edges, white at. tips, in the right chelipe<l gaping at base, in the left in 

 contact. .Vml>ulat(U> legs xcry short, narrow, llatlened; meral, car|»al, 

 and pi«>podal Joints with a denticulate crest above; nieral Joints with a 

 narrow, hMigitndiual grooNc below, edges of groove denticulate; last 

 two joints den.sely hairy undenu'ath. Surface pubescent. 



