54 Addison E. Verrill, 



Probably more than one species of Leucifer will be found in 

 Bermuda waters, but the following species is likely to be the most 

 frequent, for it was taken at many places in the Gulf Stream region 

 by the U. S. Fish Comm. steamers, Fish-hawk and Albatross. 



The neck is rather slender, about twice as long as the thorax 

 and about equal in length to the uropods and to the sixth segment 

 of the abdomen. The thorax has a small spine on each side of 

 its front edge. The first five abdominal segments contain a rela- 

 tively large, apparently phosphorescent organ, similar to those in 

 Thysanopoda, etc. 



The rostrum is small, acute-triangular, acuminate with a small 

 acute terminal cusp, often broken off. The eye is moderately 

 large, round ; its stalk is elongated, nearly half as long as the neck, 

 obconic, tapering to a small base. The antennular peduncle is 

 slender and long; its first article much the longest, as long as, 

 or longer than eye-stalk and eye; flagellum is long and slender. 

 The antennal peduncle is about half as long ; it reaches about to 

 end of eye-stalk, minus eye, and is not as long as first article of 

 antennule. Its scale is very long and in most cases not very 

 narrow, though often appearing so, owing to its position in 

 mounted specimens. It is often wider than the antennal peduncle, 

 or twice as wide as the antennule ; it reaches about to the end of the 

 second article of the antennular flagellum ; its edges are nearly 

 parallel for the proximal half ; inner edge distally curves gently 

 to the obtuse end, which carries a small spine on the outer angle. 

 It is about twice as long as the antennal peduncle. The basocerite 

 is small, with two acute, spinif orm cusps, the lower one the longer ; 

 it is placed behind and below the bases of the eye-stalks. The 

 antennal flagellum is very long and slender, about as long as the 

 body when entire (usually broken) ; its articles are elongated. 



The second maxillipeds are elongated, strongly incurved, 

 covered on the inner side with long slender hairs ; none of the 

 articles are notably thickened in the female ; in the male the 

 penultimate article is somewhat enlarged in the middle. The third 

 maxillipeds are similar to the first pair of legs in size and form, 

 and in the male of about the same length ; in the female they only 

 reach the penultimate article of the first leg, which is much shorter 

 than the others, which are very long ; the propodus and dactyl are 

 fringed on the inner edge with long hairs. 



The third leg is blunt and tipped with a small claw or hook and 



