254 



BUKLETIK 120. UNITED STATES NATIONAL MUSEUM 



Hyas araneus Leach, Edin. Encyc, vol. 7, 1814, p. 431; Malac. Podoph. 

 Brit., 1816, pi. 21A, colored, and explanatory text.— Rathbtjn, Proc. 

 U. S. Nat. Mus., vol. 16, 1893, p. 67, and synonymy; in Grenfell, Labra- 

 dor, 1909, p. 481. — BiRULA, Annuaire Mus. Zool. Acad. Imp. Sci. St. 

 P^tersbourg, vol. 11, 1906 (1907), p. 4.— Hansen, Danish Ingolf-Exped., 

 vol. 3, part 2, 1908, p. 13, except Brandt's and Stuxberg's records. — 



BiRULA, M6m. Acad. Imp. Sci. St. 

 Petersbourg, ser. 8, vol. 29, 1910, 

 p. 4, pi. 1, fig. 1. — Dons, Troms0 

 Mus. Aarshefter 34, 1912-13, p. 146, 

 pi. 1, figs. 1-13; pi. 2, figs. 1 to 8, 11; 

 pi. 3, figs. 1 & 2, text-figs. A 1, 3, 5 & 

 7, B 1 & la, C; 37, 1914 (1915), p. 86. 

 — Von Hofsten, K. Sv. Vet. Akad. 

 Handl., vol. 54, 1916, p. 63. 

 Hyas coardatus, var., Hoek, Niederl. 

 Archiv f. Zoologie, Suppl. vol. 1, 

 Lief. 3, 1882, p. 3, pi. 1, fig. 1. 

 Hyas coardata Stuxberg, Vega-Exp. 



Vetensk. lakt., vol. 5, 1886, p. 51. 

 Hyas araneus, var. hoeki Birula, An- 

 nuaire Mus. Zool. Acad. Imp. Sci. St. 

 Petersbourg, vol. 2, 1897, p. 442 [38] 

 (type-locality, White Sea, 3-100 

 fathoms; type in Petrograd Mus.); 

 vol. 4, 1899, p. 37 [18], text-fig. 3. 

 Hyas araneus hoeki Birula, Mem. Acad. 

 Imp. Sci. St. Petersbourg, ser. 8, vol. 

 29, 1910, p. 3, and synonymy. 



Diagnosis. — Carapace sub triangular; 

 -\ \ hepatic region not dilated laterally. 



Fig. 92.— Hyas araneus (10031), maxilli- Basal autennal article sub triangular, 

 FED, X 2.85 narrowing anteriorly (fig. 90, a). 



Description. — Carapace very convex antero-posteriorly, strongly 

 deflexed in front of the middle of the gastric region. Rostral horns 

 contiguous. Lateral margins of carapace tuberculate behind the 

 postorbital tooth, converging anteriorly throughout their length, or in 

 small specimens the margins of the postorbital teeth may be parallel; 

 marginal line interrupted between hepatic and branchial regions by a 

 small, shallow sinus. Surface uneven, ornamented with pustulate 

 tubercles, especially on the median gastric area and in an oblique 

 row on each branchial region; on the intestinal region two tubercles 

 side by side which may in small specimens be united in one. Basal 

 article of antenna subtriangular, narrowing anteriorly, margins thick. 



Chelipeds in old male stout, fingers thick, shghtly compressed, 

 fingers very narrowly gaping when closed; first ambulatory leg longer 

 than cheHped. 



Color. — The dorsal surface except of the fingers a dull purplish 

 red, ventral surface chiefly buff, according to Leach's figures. 



