94 



IV. Subgenus Para pandalus, Borraclaile (Type P. serratifrons, Borradaile). 

 As Plesionilea, but epipoclites are absent from all the thoracic legs. 



Key to the subgenera of Pandalus of the Indian Necton. 



I. Epipoclites are present, on the first four pairs of thoracic legs ... Plesionika. 



II. No epipoclites behind the external maxillipeds 



Para pandalus. 



Subgenus Plesionika, Spence Bate. 



Plesionika and Nothocaris, Spence Bate, Challenger Crnst. Macrnra, pp. 640, 650. 



External maxillipeds with an exopoclite. Scaphognathite broadly rounded, 

 not acutely produced. All the thoracic legs except the last have an epipodite. 

 Last 3 pairs of legs long and slender. 



Synopsis of the Indian species of Plesionika. 



I. The legs of the 2nd pair are of equal or nearly equal length. The dorsal 

 border of the rostrum, beyond the tip of the antennular peduncle, is 

 quite smooth : — 



1. The ventral border of the rostrum is very closely and evenly 



serrated : the 2nd pair of legs do not nearly reach the tips of 

 the external maxillipeds : ocellus distinct : — 



i. The posterior border of the 3rd abdominal tergum though 



convex is not acutely produced ... ... P. (P.) martins. 



ii. The posterior border of the 3rd abdominal tergum is 

 acutely produced into a sharp tooth that overlaps the 

 next tergum ... ... ... ... P. (P.) ensis. 



2. The ventral border of the rostrum is armed with a series of distant 



spines : the 2nd pair of legs reach the tips of the external 



maxillipeds : no ocellus ... ... ... ... P. (P.) alcochi. 



II. The legs of the 2nd pair are conspicuously unequal in length : the dorsal 

 border of the rostrum is spinose in all its extent : — 



1. Rostrum longer than the carapace: telson as long as the 6th 



abdominal somite : 5th pair of legs the longest of all : 1st pair 

 of lews much louger than the external maxillipeds : ocellus 

 particularly distinct ... ... ••• — P. (P.) ocellus. 



2. Rostrum shorter than the carapace : telson as long as the 5th and 



6th abdominal somites combined : one of the legs of the 2nd 

 pair is the longest of all : external maxillipeds much longer 

 than the 1st pair of legs: no ocellus ... ... ••• P- (?) bifnrca. 



In addition to the above, the young of a species that, I think, must be P. unidens Spence 

 Bate, has been found in Indian Seas. It is easily recognized by the median carination of the 

 posterior half of the 3rd abdominal tergum, and by the isolated dorsal spine just behind the tip of the 

 rostrum. 



