Indian Deep-sea Crustacea. 285 



Heterocarpus, A. Milne-Edwards. 



Heterocarpus Icevigatus, Speace Bate. 



Heterocarpus Icevigatus, Spence Bate, ' Challenger ' Micrura, p. 638, 

 pi. cxii. fig. 3. 



In one specimen, 178 millim. long from tip of rostrum to 

 end of telson, the dorsal crest is armed with four large teeth, 

 while in seven other specimens there are five teeth on the 

 crest. The under margin of the rostrum is armed with eleven 

 to thirteen teeth. (In Spence Bate's type the rostrum was 

 broken.) In the smaller specimen the rostrum is bent up at 

 an acute angle and the dorsal spines are relatively longer 

 than in the larger specimens. 



Station 232, 430 fathoms, eight specimens. 



New to the Indian fauna. 



Plesionika, Spence Bate. 

 Plesionika affinis, sp. n. 



Closely allied to Plesionika uniproducta and Plesionika 

 unidens. 



Carapace smooth, dorsally carinate in rather more than its 

 anterior half, armed behind the level of the orbit with three 

 procumbent teeth on the carina, which is produced into a 

 slender rostrum rather longer than the dorsal length of the 

 carapace. At first the rostrum curves quickly downwards to 

 the level of the antennules, on reaching which it continues 

 with a slight downward tendency to its tapering extremity. 

 On its dorsal margin above the eye are three procumbent 

 teeth, the most anterior at the level of the cornea, and close 

 to the tip is a minute spinule ; on the anterior fourth of its 

 lower margin are some six minute procumbent spinules. 



The anterior margin of the carapace is similar in form to 

 that of Plesionika uniproducta, and, like it, armed with well- 

 developed teeth corresponding to the antennules and the 

 fronto-lateral angle. 



The third abdominal segment in its posterior dorsal quarter 

 is surmounted by an upstanding carina produced posteriorly 

 into a sharp well-marked tooth overhanging the fourth 

 segment. The rest of the abdominal segments are smooth. 

 The sixth segment is rather more than twice the length of 

 the fifth segment. 



The second joint of the antennal base is armed with a long- 

 sharp tooth like that of Plesionika uniproducta (vide ' Chal- 

 lenger ' Macrura, pi. cxiii. fig. 1 c). 



Two specimens, 36 millim. from tip of rostrum to end of 

 telson, were obtained at Station 236, 172-303 fathoms. 



