3o6 Records of the Indian Museum. [Vol. XIII, 1917.J 



The lateral process of the antennular peduncle reaches to the 

 end of the basal segment, or as far as the middle of the second 

 segment. 



The carpus of the first peraeopods (text-fig. 6a) is much broader 

 than in any other race or species of Paratya that I have seen ; in 

 females it is only from 13 to i*6 times as long as broad and in 

 males from ry to 1*9 times. It is very deeply excavate anteriorly. 

 The carpus of the second peraeopods (text-fig. 66) is from 4*2 to 4*9 

 times as long as broad. In the third peraeopods (text-figs. 6c, d) 

 the propodus, in females, is from 4*3 to 5*2 times as long as the 

 dactylus, from 37 to 3'9 times in males. Excluding the spines the 

 dactylus is only from 2'i to 27 times as long as broad, being rather 

 more slender in males than in females. The spines are less nu- 

 merous than in the typical form; they vary from 6 to 8, the 

 number occasionally rising to 9 in males. In the fifth peraeopods 

 (text-figs. 6e, /) the propodus is from 4*2 to 4*4 times as long as the 

 dactylus, the proportion in males rarely falling to 3*9, The dacty- 

 lus, excluding the spinules, is from 2*4 to 2'8 times as long as 

 broad. The spinules are from 35 to 43 in number and differ con- 

 spicuously from those of the typical form in one particular. In the 

 Australian race, as in all other members of the genus save the 

 present one, the spinules towards the apex increase successively in 

 size by even gradations. In the Norfolk I. form the spinules are 

 fine and regular throughout the greater part of the dactylar 

 length, but close behind the tip there is a sudden break in con- 

 tinuity, the three, less commonly two terminal teeth being vastly 

 larger than the adjacent members of the series (text-fig. 6/). 



As in the typical form the third and fourth legs of the male 

 show no signs of sexual modification. 



There are no ovigerous females among the specimens examined. 

 Examples from the west side of the island reach a length of 32 

 mm. ; those from the east side do not exceed 18 mm. 



It appears to me not improbable that the Norfolk I. form 

 deserves rank as a full species, but further work on the Australian 

 races is necessary before its precise position can be determined. 



The types are from the west side of the island and bear the 

 number 8500/10 in the register of the Zoological Survey of India. 



