162 A. Alcock — Oarcinological Fauna of India. [No. 1, 



Basal antennal joint large, extending outwards and upwards into 

 the gap between the front and the orbit ; the flagellum situated in the 

 orbital hiatus. 



Anterior edge of merus of external maxillipeds almost transverse. 



Chelipeds unequal, twice or more the length of the carapace, about 

 half the arm projecting beyond the edge of the carapace : fingers large, 

 strongly arched, broadened and deeply hollowed at tip. 



Legs with the meropodite carpopodite and propodite sharply spinous 

 along their upper border. 



Abdomen of the male five-jointed. 



Phymodius is distinguished from Chlorodius by the extensive and 

 distinct areolation of the carapace, by the narrower front, and by the 

 spiny armature of the dorsal border of the legs. 



Key to the Indian species of Phymodius. 



I. Lobules of carapace smooth but dull; chelipeds rough 

 with nodules or tubercles ; legs with scattered hairs that 

 do not hide the spines : — 



i. Sculpture of carapace sharp cut ; chelipeds with 



postule-like tubercles extending as far as fingers. P. ungulatus. 

 ii. Sculpture of carapace worn ; chelipeds with irre- 

 gular nodules that do not usually reach more 



than halfway along the hand P. monticulosus . 



II. Lobules of carapace smooth and polished, as also are the 

 chelipeds ; legs with a stiff fringe of hair along the 

 anterior border concealing the spines there P. sculptus. 



86. Phymodiits ungulatus (Edw.) A. M. Edw. 



Chlorodius ungulatus, Milne Edwards, Hist. Nat. Crust. I. 400, pi. xvi. figs. 6-8 : 

 Dana, U. S. Expl. Exp. Crust, pt. I. p. 205, pi. xi. figs. 8a-& : Hess, Archiv. 

 fur Naturges. XXXI. 1865, pt. i. pp. 135, 171 : Streets, Bull. U. S. Nat. Mas. VII. 

 1877, p. 105. 



Phymodius ungulatus, A. Milne Edwards, Nouv. Archiv. du Mus. IX. 1873, 

 p. 218: Hilgendorf, MB. Ak. Berl. 1878, p. 790 : Kossmann, Reise roth. Meer. 

 Crust, p. 34 : Haswell, Cat. Austral. Crust, p. 59 : Miers, Challenger Brachynra, 

 p. 139 : Cano, Boll. Soc. Nat. Napol. III. 1889, p. 201 : J. R. Henderson, Trans. 

 Linn. Soc, Zool., (2) Y. 1893, p. 362 : Ortmann, Zool. Jahrb. Syst. VII. 1893-94, 

 p. 464 : de Man, Zool. Jahrb. Syst. VIII. 1894-95, p. 524. 



? Xantho de Haanii, Krauss, Sudafr. Crust, p. 29, pi. i. fig. 2 : Heller, SB. Ak. 

 Wien, XLIII. 1861, p. 337, and Novara Crust, p. 19. 



Chlorodius areolatus, Adams and White, Samarang Crust, p. 41, pi. xi. fig. 3. 



The regions and numerous sub-regions of the carapace are all 

 convex and sliarply defined by clean-cut furrows ; their surface is 

 smooth but dull, owing to close microscopic granulation. 



