92 



2. Pinidalina, Caiman, Ann. Mag. Nat. Hist., Jan. 1899, p. o7. 



3. Chlorotocus, A. M. Edw. 



4. Heterocarpus, A. M. Edw. 



5. Dorodotes, Sp. Bate. 



Dichelopandalus, Caullery, as Caiman suggests, is probably identical with 

 Pandahis. 



Key to the genera and snbgenera of Pandalidse of the Indian Necton. 



I. The carpus of tlie 2nd pair of thoracic legs is multiarticulate : 



1. Except for a post-rostral crest, the carapace is smooth : 



i. Eyes large, much wider than the eyestalk (PANDALUS): 



a. Epipodites absent from the last pair Jof thoracic 



legs only ... ... ... s.g. Plesionika. 



b. Epipodites absent from all the legs ... s.g. Parapandalus. 

 ii. Eyes very small, narrower than the eyestalk ... DOKODOTES. 



2. Carapace with longitudinal carinffi,in addition to the post-rostral 



crest : integument very hard and rigid ... HETEROCARPUS. 



II. The carpus of the 2nd pair of legs is divided into two segments only ... CHLOROTOCUS. 



PANDALUS, Leach. 



Pandalus, Leach, Maine. Pod. Brit. pi. xl. : Milne Edwards, Hist. Nat. Crnst. II. 383 : Spence Bate, Challenger 

 Crustacea Macrura, p. 665 : Caiman, Ann. Slag. Nat. Hist. (7) III. 1899, p. 29. 



Body moderately compressed. Rostrum long, serrated dorsally and ventr- 

 ally. Carapace smooth, its anterior border with an orbital (antennal) and a 

 branchiostegal spine. 



Abdomen smooth, the 3rd tergum usually with a convex posterior border ; 

 the pleura thin and large, those of the 2nd somite very broadly overlapping 

 those in front and behind. Telson narrow, tapering, spiny along the dorsal 

 edges and at tip. 



Eyes large, globular : there is usually a distinct " ocellus " near the middle 

 of their dorsal margin. 



Antennular peduncle short, with a scale at the base of the outer margin of 

 the 1st joint : antennular flagella of good length, the outer one thickened at its 

 proximal end, especially in the male. 



Antennal scale long and slender, its outer ^margin broadly thickened and 

 ending very acutely. 



External maxillipeds long, pediform, stouter than ^the 1st pair of legs : 

 exopodite present or absent : the base of the epipodite forms a plate-like lobe. 



First pah- of legs short and slender, ending either simply or, as Messrs. 

 Caullery and Caiman have recently demonstrated, in a microscopic and im- 

 perfect chela. Second pair of legs minutely chelate with a subdivided or 

 multiarticulate carpus. 



