MUSEUM OF COMPARATIVE ZOOLOGY. 



81 



? BENTHESICYMUS Bate. 



A single mutilated male specimen is referred very doubtfully to this genus, 

 recently and only very imperfectly characterized by Bate. This specimen wants 

 the larger part of the external maxillipeds, of the Bagella of the antenna and an- 

 tennulae, and of the three last pairs of thoracic legs, but the branchial formula 

 is the same as given l>y Bate for his genus, and as far as the diagnosis goes the 

 specimen agrees with it. There is nothing in the branchial formulae given by 

 Bate in regard to the seventh somite (the first maxillipedal), but in the specimen 

 before me there is an epipod and a single arthrobranchia at the base of the 

 first maxilliped. The eightb somite bears two arthrobranchia, a podobranchia, 

 and an epipod ; the ninth to the twelfth inclusive bear each a plenrobranchia, 

 two orthrobranchia, a podobranchia, and an epipod : the thirteenth 1 

 plenrobranchia, two arthrobranchise, and an epipod : and the fourteenth 

 a pleurobranchia only : making in all twenty-four branchin and seven epi- 



pods, and of the true branchia six are pleUTO-, thirteen arthro-.and eight podo- 

 branchia! The species here described has no ezopods at the bases of the 

 thoracic legs, and the maxilla and first and Becond maxillipeds are much less 



VOL. X. —NO. 1. 6 



