Records of the Indian Museum. 



[Vol. VI, 



hitherto undescribed. The other specimens in the same bottle are 

 to be referred to Pontophilus australis,^ and as this species is ex- 

 tremely closely allied to the new form, it will be convenient to 

 express the differences between the two in parallel columns — 



P. australis (Thomson). 



Rostrum narrow (fig. i). 



Two mid-dorsal spines of 

 carapace situated close together 

 in anterior third (fig. i). 



Antennal scale a trifle more 

 than twice as long as wide (fig. 



3). 



Propodus of first peraeopod 

 not narrowed anteriorly: i.e., 

 as broad behind subchelate 

 termination as at base (fig. 2). 



Sixth abdominal somite more 

 than one and a half times 

 length of fifth and bearing 

 dorsally a pair of distinct but 

 blunt longitudinal carinae (fig. 



5)- 



Apex of telson narrow.^ 



P. chiltoni, sp. nov. 



Rostrum broad (fig. 6).''' 

 Two mid-dorsal spines of 

 carapace widely separate; pos- 

 terior spine situated exactly in 

 middle of carapace (fig. 6). 



Antennal scale considerably 

 less than twice as long as wide 



(fig- 8). 



Propodus of first peraeopod 

 evidenth^ narrowed anteriorly : 

 i.e., distinctly broader at base 

 than behind subchelate termi- 

 nation (fig. 7). 



Sixth abdominal somite less 

 than one and a half times 

 length of fifth, with a median 

 longitudinal depression, but 

 without distinct carinae (fig. 

 10). 



Apex of telson broader.^ 



In addition, P. chiltoni is a trifle stouter in build than P. 

 australis, the terminal joint of the fourth pair of peraeopods is a 

 little shorter and broader, and the spinous processes on the postero- 

 inferior margin of the fifth abdominal somite are distinctly 

 blunter. 



Two specimens, ovigerous fem.ales, 30 and 32 mm. in total 

 length, from New Zealand. (Regd. Nos. xo2_er-_3_o,) 



Pontophilus sabscchota,* sp. 



nov. 



(Plate ii, figs. 11 — 14.) 



The general form is short and stout. Measured dorsally, the 

 carapace (including the rostrum) is longer than the first five abdo- 

 minal somites, and its breadth is almost as great as its length. 



1 Pontophilus australis (Thomson), Trans. Linn. Sac. London {2), viii, 1903, 

 p. 434, pi. 27, figs. 1—5. 



2 In the second specimen the rostrum is a trifle narrower than is shown in 

 this figure, but is still very evidently broader than in P. australis. 



s The distinctions afiforded by the comparative length of the telson and 

 uropods, as seen in figs. 5 and 10, cannot be relied upon for differentiating the 

 two species. 



* Hindustani, ^' sab se chota" : the smallest of all. 



