86 



BULLETIN OF THE 



Length of carapax including rostrum 



" rostrum 



" antennal scale 

 Breadth of " " . . 



Length of abdomen 



" sixth somite 

 Height of " ... 



Length of telson 



" inner lamella of uropod 

 Breadth of " " " 



a « 



Length of outer 



24.8+ mm. 



3.5+ 

 17.1 



5.2 

 53.0 

 12.4 



7.5 

 10+ 

 11.0 



3.2 

 17.0 



4.0 



Breadth of " " 



Station 343, N. Lat. 39° 45' 40", W. Long. 70° 55', 732 fathoms ; one male 



AMALOPENu^US, gen. nov. 



Like the last species in general appearance, but readily distinguished from 

 it by the second maxillipeds, in which the meri expand into broad opercular 

 plates, and in having no podobranchiae on any of the thoracic legs. The integ- 

 ument of the whole animal is membranaceous, and very soft and thin. The 

 carapax, eyes, antennulse, antennae, mandibles, and maxillae are nearly as in 

 the species last described. The endopod of the fir.st maxilliped is divided into 

 three segments as in that species, but the terminal segment is larger than the 

 penultimate, and the exopod is broad and lamelliform throughout. The merus 

 of the second maxilliped is expanded in a thin lamelliform plate along the 

 inside and beyond the articulation of the carpus, so that when the three distal 

 segments are flexed they are concealed beneath it. In the external maxillii)eds 

 the ischium is longer than the merus, and both these segments are very much 

 broader than the slender carpus and propodus, or than the short flattened and 

 pointed dactylus. The first three pairs of thoracic legs are approximately 

 equal and their chelaj are slender and subequal in size, but in the first pair the 

 ischium and merus are compressed and considerably expanded. The fourth 

 and fifth pairs of legs are about as long as the third, and very slender. There 

 are no exopods at the bases of any of the thoracic legs. The branchia; are 

 arranged as in the last species except that there are no podobranchiaj at the bases 

 of any of the thoracic legs, so that there are only twenty branchiae apd seven 

 epipods on each side, as indicated in the following table. 



Somites. VII. VIII. 



Epipods, 1 1 



Podobranchiae, 1 



ArthrobranchiBe, 1 2 



Pleurobrauchise, 



20-f(7) 



