116 Faxon, Lucifer. 



There is no trace of the fourth and fifth pair 

 of "decapodal" legs, nor of outer branches on any 

 of the thoracic pairs. 



The first pair of abdominal appendages in this 

 (male) specimen are armed with the peculiar pre- 

 hensile organ (Figure 1, m',) which is commonly 

 found in the males of this genus. It consists of a 

 movable piece (Figure 3, a,) which closes upon a 

 blunt process, (Figure 3, ft,) tipped with minute 

 teeth. There is but one terminal branch. 



The second pair of abdominal appendages have 

 three terminal branches, (Figure 1, n', n", of',) the 

 remaining four pairs possess two terminal branches. 

 The outer branch of the last pair (Figure 1, r 1 ,) is 

 longer than the inner branch, (about one-third 

 longer than the telson,) and is produced at pos- 

 tero -lateral angle into a sharp tooth. The terminal 

 branches of all the abdominal limbs are furnished 

 with setae, excepting the short plate-like third 

 branch of the second pair, (Figure 1, n'".) 



Length, 9 millimetres. 



The single specimen obtained agrees in most 

 respects with the description of the earliest known 

 species by J. R. Thompson, (Note 3.) It differs 

 noticeably, however, in the shorter eye-stalks. In 

 this it agrees better with Lucifer Begnaudii, M. 

 Edw., (Note 4.) In view of the unsatisfactory 

 description of the known species, I have thought 

 best not to impose a new specific name upon this 



