192 A. Alcock — Carcinological Fauna of India. [No. J y 



11 1. Pilumnus vespertilio, Fabr. 



Cancer vespertilio, Fabricius, Ent. Syst. II. 463, and Suppl. p. 338. 



Pilumnus vespertilio, Desmarest, Consid. Gen. Crust, p. 112 : Latreille, Encyc. 

 Meth. X. p. 125 : Milne Edwards, Hist. Nat. Crust. I. 418, and in Cuvier's Regne 

 An., Crust, pi. xiv. fig. 3 : Dana, U. S. Expl. Exp. Crust, pt. I. p. 236 : Heller, 

 SB. Ak. Wien, XL1II. 1861, p. 343 : A. Milne Edwards, Nouv. Archiv. du Mus. IX. 

 1873, p. 242 : Miers, Crust. New Zealand, p. 19 ; and Ann. Mag. Nat. Hist. (5) V. 

 1880, p. 234; and Zool. H. M. S. Alert, pp. 183, 219 : Tozzetti, Magenta Crust, p. 55, 

 pi. iv. figs. 25, 27, 32 : Hilgendorf, MB. Ak. Berl. 1878, p. 793 : E. Nauck, Zeits. 

 Wiss. Zool. XXXIV. 1880, p. 53 (gastric teeth) : Richters in Mobius Meeresf. Maurit. 

 p. 148 : Haswell, Cat. Austral. Crust, p. 65 : Filhol, Crust. New Zealand, p. 374, 

 pi. xlv. fig. 5 : de Man, Journ. Linn. Soc, Zool., XXII. 1887-88, p. 58 ; and Archiv. 

 fur Nat. LIU. 1887, i. p. 295 ; and in Weber's Zool. Ergebn. Niederl. Ost-Ind. II. 

 1892, p. 283 ; and Zool. Jahrb., Syst., VIII. 1894-95, p. 537 : Cano, Boll. Soc. Nat. 

 Napol. II. 1889, p. 206: A. 0. Walker, Journ. Linn. Soc, Zool., XX. 1886-90, 

 p. 110: J.R.Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 365: Ortmaim, 

 Zool. Jahrb., Syst., VII. 1893-94, pp. 436, 438, and in Semon's Forschungsr. (Jena. 

 Denk. VIII) Crust, p. 49 : Zehntner, Rev. Suisse Zool. II. 1894. p. 154. 



Pilumnus ursulus, Adams and White, Samarang Crust, p. 45, pi. ix. fig. 6 : 

 Hess, Archiv. fur Nat. XXXI. 1865, i. pp. 137, 171, pi. vi. fig. 2: Kossmann, Reise 

 roth. Meer., Crust, p. 39 : F. Muller, Verh. Ges. Basel, VIII. 1886, p. 475. 



Carapace, legs and chelipeds (with the exception of the fingers and 

 the lower corner and lower border of the hand, which are bare) entirely 

 concealed by a thick, dark, shaggy coat of coarse, tufted and somewhat 

 matted hair. The hairs are of two kinds, longer and shorter, the longer 

 being most numerous on the legs and on the borders of the carapace. 

 The following description (and the descriptions of all the species men- 

 tioned in this paper) applies to the denuded animal. 



Carapace transversely oval, nearly £ as long as broad, flat pos- 

 teriorly, a good deal deflexed anteriorly, the regions fairly distinctly 

 delimited and areolated, the surface studded with small well-separated 

 clusters of granules, from which the hairs spring. 



Front obliquely deflexed, about a third the greatest breadth of the 

 carapace, cut into two lobes, each of which consists of a large prominent 

 convex inner division and a small receding semi-independent, but not 

 dentiform, outer angle, lying nearly in front of the inner upper angle of 

 the orbit. 



The orbital margins, like the edge of the front, are smooth or 

 obscurely crenulate ; in the upper margin are two broad triangular 

 gaps : the outer angle of the orbit is sharp but not spiniform, and imme- 

 diately below it is a fissure or gap in the infra-orbital margin. 



The antero-lateral border is a little shorter than the postero-lateral, 

 and is cut into three spiniform teeth, besides which there is a sub- 

 hepatic denticle behind and below the outer orbital angle. 



