156 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Station 245. 1 ,058 fathoms. 1 specimen.^ 



" 257. 553 "• 2 " 



" 265. 576 " 2 " 



268. 955 " 1 " 



" VII. 610 " 1 



" XVIII. 60O " 2 



Nephcopsis agassizii A. M. Edw. 



Nephropsis agassizii A. M. Edw., Ann. Sci. Nat., Zool., Q^ ser., VoL IX. No. 2, 

 1880. 



Station 195. 5021 fothoms. 1 ? . 



200. 472 " I ^. 



" 227. 573 " 1 <?. 



Nephropsis aculeata Smith. 



Nephropsis aculeata Smith, Proc. U. S. Nat. Mus., Vol. III. p. 431, 1881. 

 Nephropsis nf/assizii Smith, Bull. Mus. Comp. Zool., Vol. XV. p. 44, Fig. 240, 



1888 (nee A. M. Edw.). 

 Nephropsis rosea ( W.-Suhm MS.) Bate, Rep. " Challenger" Macrura, p. 178, Fig. 39, 



PI. XXIII. Figs. 1, 2, PI. XXIV. Fig. 1, 1888. 



333 fathoms. 3 specimens. 



1 " 



3 



1 



1 



1 



There are two species of Nephropsis in the West Indian region , N. agassizii 

 A. >[. Edw-., w-ith two pairs of lateral spines on the rostrum, and N. aculeata 

 Smith, with only one pair of rostral spines. N. agassizii was very inade- 

 quately described by A. Milne Edwards, and the type specimen, from the 

 Strait of Florida, 1,500 metres, has never been returned to Cambridge. Soon 

 after, the other species, N. aculeata, was described by Smith from .specimens 

 obtained off the south coast of New England, in 100 to 126 fathoms. Subse- 

 quently Smith and other authors supposed that N. aculeata was identical with 

 N. agassizii. The chief differences between the two species are the following. 

 In N. agassizii the rostrum is armed with two or two and a half pairs ^ of 

 lateral teeth ; in N. aculeata there is only one pair of lateral rostral spines ; 



1 Identified as P. arjnssisii bj' A. Milne Edwards, and so recorded bj' him in 

 Bull. Mus. Comp. Zoo]., Vol. VIII. p. fi6, 1880. 



- The third lateral spine may occur on either the right or the left side of the 

 rostrum. 



