STALK-EYED CRUSTACEA 469 



this keel and rostrum has above about seventeen and 

 below eight teeth. 



The eyes are small. The flagella of the internal 

 antennae are longer than the rostrum. The abdomen is 

 wide ; the fourth and fifth segment only are keeled. The 

 legs of the third pair are spinous above on the fourth and 

 fifth joint. 



Range. — Barbados, Philippine Islands. 



2. Heterocarpus oryx, 



Heterocarpiis oryx ... A. Milne Edwards. 



Like H. ensifer, except the form of the carapace is 

 thinner ; there is no third keel or latero-superior keel. 

 The rostrum is strongly toothed above. There are teeth 

 on the median keel of the carapace up to a small distance 

 from the posterior edge (about fourteen above and nine 

 below). The abdominal keel is prolonged into a short 

 point upon the third, fourth, and fifth segment. The 

 flagella of the internal antennae do not reach the ex- 

 tremity of the rostrum. 



Range. — West Indies. 



2, Pandalus. 



Pandalus . Leach, H. Milne Edwards, Spence Bate. 



The anterior portion of the carapace is keeled, and 

 produced to a long rostrum that is armed abovo with 

 movable spines and with hairs, below with rigid fixed 

 teeth. In front there is an antennal tooth, and a second 

 tooth on the antero-lateral angle of the carapace. Ab- 

 domen is smooth ; third segment more compressed than 

 the preceding segment, posteriorly produced to a point. 

 Sixth segment longer than the fifth. Telson longer than 

 sixth segment ; narrow, tapering, dorsally flat, laterally 



