MUSEUM OF COMPARATIVE ZOOLOGY. 253 



As in the last species, there is a tubular organ near the middle of the fourth 

 joint of each leg; but this is relatively six or eight tiiues as long as in the for- 

 mer, and has the appearance of a long, blunt spine. 



Color nearly white. 



Length of body (without rostrum) 6.0 mm. 



** rostrum 3.5 " 



" legs 26.5 " 



One male (with egg-mass) and one female specimen from locality 891, 

 N. Lat. 39° 46', W. Long. 71° KT, 500 fathoms, mud and fine sand. U. S. 

 F. C. 1880. 



It seems possible that a larger series may show the two forms described 

 to be only varieties of the same species. But so far as shown by the speci- 

 mens at hand (which are adult), they appear perfectly distinct, the most 

 striking points of difference being in the "antennae," rostrum, oculiferous 

 segment, and especially in the armature of the propodus, which is character- 

 istic and pretty constant. There is also a marked difference in the length 

 of the glandular duct of the fourth joint of the legs. 



Nymphon grossipes (L.), Chr. Fabr. 



A single specimen from locality 306, N. Lat. 41° 32' 50", W. Long. 65° 55', 

 524 fathoms, which extends its known range of depth more than 100 fathoms. 

 It is of the variety described by Kroyer as Nymflwn mixtum, the tarsus being 

 much longer than the propodus, and the oculiferous segment long and slender. 

 The oculiferous tubercle is not much elevated, and the auxiliary claws are 

 rather large. Ocelli are well developed. Color nearly white. 



Length of body (including rostrum, etc.) 8.0 mm. 



legs 33.5 " 



Nymphon Stromii, Kroter. 



Eight specimens (of which three are males with eggs) from locality 306 (with 

 last species), one specimen from 310, N. Lat. 39° 59' 16", W. Long. 70° 18' 30", 

 260 fathoms. 



The greatest depth previously recorded for this species is 115 fathoms ; its 

 range is thus extended downwards more than 400 fathoms. The specimens 

 are in every respect typical, but are not of unusually great size for the species, 

 as shown by the measurements (from an average male specimen). 



Length of body (including rostrum, etc.) 12.0 mm. 



" rostrum 3.5 " 



" legs 75.0 ♦' 



