STALK-EYED CRUSTACEA 467 



length with the rostrum. The three posterior pairs of 

 legs, longer than the two front pairs, have their last joint 

 armed with numerous spinules. 

 Range. — Atlantic, Gulf weed. 



Family IV. Pandaiidas. 



Panda/idee . . . Spence Bate. 



Carapace about one-third the total length of animal. 

 Rostrum long and slender, armed with teeth or spines. 

 Eyes well developed. The internal antennje terminate 

 in two flagella. The external antennas have a large 

 basal scale. The external maxillipedes are pediform. 

 The first pair of legs not provided with pincers ; the 

 second pair has pincers ; the other three pairs simple. 

 The abdominal appendages are two - branched. The 

 swimming organ is well developed and strong. 



Synopsis of the Genera. 



A. Carapace laterally and dorsally keeled. Rostrum 

 armed with teeth above and below. — i^Heterocarpus?) 



B. Carapace smooth. Rostrum armed above with 

 movable spines, below with teeth. — {Pandalus). 



I. Heterocarpus. 



Heterocarpiis ... A. Milne Edwards, Spence Bate. 



The carapace is keeled at the sides and above, which 

 terminates in a rostrum, that is generally armed with 

 teeth above and below. The abdomen has on some of 

 its segments a median keel terminating behind in a point. 

 The telson, long, laterally compressed, is generally armed 

 with small spines. Eyes short. The internal antennae 

 have a short peduncle armed with a spine ; flagella long, 



