1875.] J. Wood-Mason — On new or little-known Crustaceans. 281 



Paratelplmsa Edwurdsi. 



Latero-anterior margins of carapace with four teeth, the teeth all 

 equal and similar to one another, large, almost conical, aud very salieut. 

 Carapace considerably areolated, longitudinally very convex, antero-lateral 

 margins much inclined, post-frontal crest well-developed. Post-abdomen of 

 the male as in the preceding. 



Hab. — Cachar, Saddya, and the Garo-, Naga-, and Dana-hills. 

 Paratelpli as a crenulifera. 



Latero-anterior margins of carapace with four teeth, the teeth tolerably 

 well-developed and salient, flattened, diminishing gradually in size from 

 before backwards. Carapace perfectly smooth, depressed, longitudinally 

 but slightly convex, antero-lateral margins hardly inclined. Frontal and 

 orbital margins conspicuously, the edges of the feebly-developed post-frontal 

 crest and of the epibranchial teeth faintly crenulate. Post-abdomen of the 

 male as in the preceding. 



Sab. — Pegu Yomah. 



Mr. Wood-Mason next exhibited a specimen of the beautiful macru- 

 rous crustacean long ago described and accurately figured by Herbst (' Krab- 

 ben und Krebse', Band II, Heft 5, 1794, S. 173, T. XLIII, F. 2.) under 

 the name of Astacus modestus. This remarkable crustacean, like the Asta- 

 cus zaleucus, v. W-S. for which the new generic title Tliaumastocheles had 

 recently been proposed (P. A. S. B., 1874, p. 181), was an example of a tran- 

 sitional form connecting the two families, Thalassinidce and Astacidcs : in 

 Tliaumastocheles zaleucus the facies of the former family was combined 

 with characters that entered into the usual definition of the latter : Eutri- 

 chocheles, as he proposed generically to designate the species described by 

 Herbst, on the other hand, was indubitably, as the totality of its organism 

 showed, a member of the latter presenting certain structural arrangements 

 which were unmistakable marks of real affinity to the former. The 

 Galliascis adriatica of Heller was just such another transitional form. In 

 fact, it was now, in his opinion, impossible to frame such a definition of 

 either family as would exclude all the members of the other owing to the 

 number of the connecting links. The Eatricliocheles modestus was also espe- 

 cially interesting as being the nearest known blood-relation of the remark- 

 able blind crayfish described two or three years ago under the name of 

 JSTephropsis Stewarti. In conclusion, Mr. Mason said that he had Ion"- been 

 engaged in the comparative study of these and various other allied forms 

 and that he hoped shortly to be able to formulate the results at which he 

 had arrived. 



Mr. Wood-Mason also exhibited several new species of Stoma topod 

 crustaceans, viz. Clorida decontta, with eyes as in G. microphthalma M.-lOdw. 

 and C. Latreillei, Ey. and Soul., the inner margin of the sabre-like 



