igio.] S. Kemp: Notes on Decapoda. i8i 



The rudimentary exopods, mentioned by Smith, are visible 

 only in the case of the female specimen. 



The merus of the second maxillipedes and the ischium and 

 merus of the third maxillipedes and first three pairs of peraeopods 

 are greatly expanded as in typical Gennadas. 



The third, fourth, fifth and sixth abdominal somites are 

 dorsally carinate. The telson is much longer than in other species 

 of Gennadas, being only a little shorter than the outer uropod. It 

 bears four pairs of lateral spines in its distal third and is sharply 

 pointed apically. 



The petasma (fig. 9) consists of a pair of simple leaves, as in 

 Boithcsicyinns. 



The thelycum has been well described by McGilchrist in the 

 following words : ' ' Between the bases of the fourth pair of legs a 

 prominent central papilla stands. Towards this papilla a hairy 

 process passes inwards and backwards from the base of each of 

 the third pair of legs and from the base of each of the fourth pair 

 of legs a tongue-shaped process projects inwards and backwards 

 posterior to the papilla. The papilla thus stands in the centre 

 iDetween the tips of these four processes." 



Apart from the type, only the two specimens mentioned above 

 are known. Smith's example, which was found off the east coast 

 of the United States, 39° 44' 30" N.. 71° 4' W., in 1,022 fathoms, 

 measures only 74 mm. in length and is thus only about half the 

 size of those from the Arabian Sea. 



