65 



The antennules, antennae, and 1st maxillae are as in Pasiphxa. 

 The branchial formula is as follows : 



Total. 



up. 



5 = 11 + 3 ep. 



From Sympasiphsea tliis genus differs in having 2 artlirobranchias to the external maxillipeda, 

 and a distinct epipodite to the 2nd maxillipeds : the body is less compressed, the daotylns of the 

 external maxillipeds differs in form, and the 5th pair of thoracic legs is not so much reduced in 

 length. 



Key to the Indian species of Parapasiphaea. 



I. The dorsal carina of the carapace is armed on the gastric region 

 only with about 5 teeth : the rostrum is a high compressed leaf, 

 with its tip deeply excised ... ... ... ... P. latirostrin. 



II. The dorsal caiina of the carapace is closely serrated in all its extent : 



the rostrum is an acute up-curved spine ... ... ... P. Gilesii. 





32. farapasiphcea latirostris, Wood-Mason. 



Parapasiphaea latiroslris, Wood-Mason, Aim. Mag. Nat. Hist., Feb. 1891, p. 196, end Feb. 1893, p. 166, fig. 2. 

 ILLUSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE L'il. FIQ. 1. 



Carapace and rostrum, measured in the middle line, not far short of the 

 length of the first six abdominal somites : the surface of the carapace is curiously 

 vermiculated with wrinkles. 



Rostrum a high thin strongly convex crest, reaching beyond the end of the 

 eyestalk but not beyond the eye, and having its tip broadly excised so as to form 

 two teeth : it is continued backwards, nearly to the posterior border of the cara- 

 pace, as a distinct carina the gastric portion of which is armed with o small 

 teeth. 



On the frontal margin the orbital and antennal angles are bluntly defined, 

 and instead of a branchiostegal angle there is a deep sinus : behind and above 

 the orbital angle is a minute spine, and above the branchiostegal sinus there is a 

 much larger one : from the latter spine a ridge runs nearly straight backwards 

 towards the posterior border of the carapace, giving off, on the hepatic region, a 

 branch that runs obliquely backwards towards the very well defined lower 

 9 



