1898.] A. Alcock — Carcinological Fauna of India. 223 



curvature and convergence of the postero-lateral borders ; its surface 

 smooth and burnished. 



The front is slightly notched in the middle line, and is separated 

 from the hardly-dentiform supra-orbital angles by a shallow notch : it 

 is thus rather obscurely divided into two lobes, each of which has the 

 free edge finely denticulate. Outer angle of orbit acute, as is also the 

 inner angle of the lower margin. 



There may be a slight notch at the junction of the antero-lateral 

 and postero-lateral borders, but there is never a spine. 



Chelipeds subequal in both sexes, about twice the length of the 

 carapace, smooth and burnished. The arm is much shorter than it is in 

 T. cymodoce and ferruginea, being broader than long, its foliaceous 

 anterior border dentate or crenate ; inner angle of wrist acute ; upper 

 border of hand rounded, lower border sharp. 



Legs smooth, dactylus with a few bristles, which are almost absent 

 from the other joints. 



Colours in spirit, blackish-brown, fingers, lower edge of hand and 

 distal ends of leg joints lighter. 



In the Indian Museum are six specimens from Ceylon and Palk 

 Straits. 



Tetralia, Dana. 



Tetralia, Dana, Silliman's Jonrn. Sci. and Arts (2) XII. 1851, p, 128, and Proc. 

 Ac. Nat. Sci. Phila., 1852, p. 83, and U. S. Expl. Exp. Crust, pt. I. p. 261. 

 Tetralia, Heller, SB. Ak. Wien, XLI1I. 1861, p. 353. 

 Tetralia, A. Milne Edwards, Nouv. Archiv. du Mus. IX. 1873, p. 261. 



Closely resembles Trapezia in form, and only differs in the following 

 characters : — 



The front is hardly separated from the hardly-dentiform supra- 

 orbital angle by a small and very inconspicuous notch, and has its free 

 edge very slightly convex, very faintly sinuous or straight (instead of 

 being divided into lobes or teeth), and finely denticulate. 



The antero-lateral borders are usually continued into the postero- 

 lateral without any trace of a spine or notch to mark their junction. 



The eyes are smaller. 



The chelipeds are usually remarkably unequal ; the arms are shorter 

 and their expanded anterior edge is not denticulate throughout. 



The meropodites of the legs are short and broad, almost foliaceous. 



The abdomen of the male consists of seven separate segments. 



147. Tetralia glaberrima (Herbst.). 

 Cancer glabcrrimus, Herbst, Krabben I. ii. 262 pi. xx. fig. 115. 

 Trapezia intcgra, Latreille, Encycl. Meth. x. p. 6D6. 



