96 A. Alcock — Carcinnlogical Fauna of India. [No. 1, 



J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 352 : Ortmann, Zool. 

 Jnhrhuch Syst. VII. 1894, p. 462. 



Atergatis subdivisus, White, Ann. Mag. Nat. Hist. (2) 1848, p. 284, nnd 

 Samarang Crust, p. 38, pi. viii. fig. 3. 



? Atergatis siobdentatus, De Haan, Pann. Jap. Crust, p. 46, pi. iii. fig. 1 : A. Milne 

 Edwards, Nouv. Archiv. du Mus. I. 1865, p. 236. 



Carapace, length from about f- to about -§■ the breadth ; its surface 

 in the anterior third or half irregularly and rather distantly pitted, 

 especially near the front and antero-lateral borders : except for two 

 faint creases that partly show the cardiac region, there are no other 

 traces of regional divisions. 



The crest-like edge of the antero-lateral border turns in at the 

 lateral epibranchial angle to form a stout ridge there : this edge some- 

 times shows traces of two or three fissures. 



The front, which is little prominent, meets the antero-lateral borders 

 at a wide but very distinct angle. 



Orbits very small, their width being much less than a third the 

 width of the front. 



Surface of the external maxillipeds either quite smooth or with 

 short and scanty hair. Sternum smooth to the naked eye, or with a 

 little scattered pitting. 



Chelipeds equal ; the upper edge of the merus sharply, the upper 

 edge of the hand and finger strongly but more bluntly, crested ; the 

 upper outer surface of the hand with some scale-like roughening. 



The outer surface of the legs is hardly pitted ; the claw, in all the 

 legs, is hairy, and there is a little tuft of hair near the far end of the 

 lower edge of the propodite, but all the other joints are generally free 

 of hair. 



Colours in spirits, pinkish ochre, fingers blackish brown, with whitish 

 tip and teeth. 



30 specimens from Mergui, the Andamans, Ceylon and Singapore. 



21. Atergatis dilatatus, De Haan, A. Milne Edwards. 



Atergatis dilatatus, De Haan, Faun. Jap. Crust, p. 46, pi. xiv. fig. 2 : A. Milne 

 Edwards, Nouv. Archiv. du Mus. I. 1865, p. 238, and Nouv. Archiv. du Mus. IX. 

 1873, p. 183, pi. v. fig. 6 : E. Nauck, Zeits. Wiss. Zool. XXXIV. 1880, p. 57, pi. i. 

 figs. 19-21 (gastric teeth) : F. Miiller, Verh. Ges. Basel, VIII. 1886, p. 474 : Henderson, 

 Trans. Linn. Soc. Zool. (2) V. 1893, p. 353. 



Closely resembles A. integerrimus, but easily recognized by the 

 following constant differences : — 



(1) the carapace is even broader, and has a sharper edge: 



(2) the surface of the carapace is much more closely aud extensively 



