56 Memoirs of the Indian Museum. [Vol. IV, 



there is a prominent lobe on the external aspect of the eyestalk. The corneal 

 and peduncular axes are very oblique. 



3. The antero-lateral angles of the carapace are produced as acute points which 



project outwards and downwards, scarcely reaching at all forwards beyond 

 the adjacent anterior margin. 



4. The lateral processes of the fifth thoracic somite consist of a sharp and very 



slender anterior spine, which is oblique but is not strongly curved forwards 

 as in most allied species, and a very short acute posterior process. The ante- 

 rior process of the sixth somite has the form of a very small acute lobe which 

 at its base is not more than one-fifth the width of the broad but acute posterior 

 process. The seventh somite is not bilobed laterally but is angled acutely 

 behind and rectangularly in front (fig. 45). 



For the rest the principal characters of the species are as follows : — 

 The whole surface of the carapace and abdomen is smooth, highly polished and 

 without trace of punctuation. The carapace is broad anteriorly; its breadth mea- 

 sured behind the antero-lateral angles greatly exceeds half its length, including the ros- 

 trum. The median carina is entirely absent in front of the small dorsal pit but other- 

 wise resembles that of 5. quinquedentata. The lateral and intermediate carinae are well 

 marked. The rostrum is broader than long and its upturned lateral margins converge 

 to a broad, evenly rounded apex. The anterior margin of the ophthalmic somite is 

 sharply pointed between the base of the eyestalks. The antennular peduncle is about 

 as long as the carapace. 



The outer inferior margin of the merus of the raptorial claw (fig. 46) is distally 

 rounded. The dorsal carina of the carpus is high and terminates in a strong lobe-like 

 tooth behind which a minute tubercle is visible. The dactylus, as in the two preced- 

 ing species, possesses five teeth including the apical one ; the outer margin is very feebly 

 sinuous and is produced almost rectangularly near its articulation with the propodus 

 (fig. 46). 



The submedian carinae are rather faint on the abdomen and on the free thoracic 

 somites are semi-obsolete. The intermediate carinae are distinct on the thoracic and 

 abdominal somites. The following abdominal carinae end in spines : — 

 Carinae. Abdominal somites. 



Submedian . . . . . . 5,6. 



Intermediate .. .. .. 2,3,4,5,6. 



Lateral . . . . . . . . 1, 2, 3, 4, 5, 6. 



Marginal .. .. .. 1,2, 3, 4, 5. 



The telson is almost precisely similar to that of 5. quinquedentata , but the teeth 

 are rather longer and the intermediate pair, in the type specimen, are not inturned. 

 There are three or four submedian denticles, eight intermediate and one lateral (fig. 47). 



All the median parts of the carapace, abdomen and telson are covered with very 

 small grey chromatophores. These are not sufficiently crowded to detract from the 

 general yellowish appearance of the spirit specimen, but are closely aggregated and 

 form faint transverse lines at the posterior margins of the abdominal and last three 



