the Species of Lucifer. 229 



In Pohrn's figure the legs are considerably longer than in 

 Bate's,. with which specimens in my hands agree. JDohrn, 

 however, is certainly wrong in his representation of the 

 antennules, and may be also inaccurate in regard to the legs. 



This species is related to Dana's acestra, but differs from 

 it in the following respects: — (i.) the rostrum is present ; 

 (ii.) the legs of the last two pairs are longer ; (Hi.) the dorsal 

 spine of the sixth abdominal segment is terminal and pro- 

 jecting, not subterminal ; (iv.) the exopodite of the uropod 

 is blunt-ended, with the terminal spine at one side, instead of 

 diminishing gradually into the spine ; (v.) the ventral tubercle 

 of the telson of the male is subrectangular, and directed 

 very slightly forward. 



Throughout the warmer parts of the Atlantic and Central 

 Pacific, near land or on the high seas. 



11. Lucifer inermis, sp. n. * 



Diagnosis : A Lucifer with the neck about twice as long 

 as the rest of the cephalothorax, the eye with stout stalk, 

 rather more than one-third the length of the neck, the last 

 leg just reaching the end of the neck, the preceding leg 

 slightly shorter, the sixth abdominal segment rather shorter 

 than the fourth and fifth together and rather longer than 

 the uropod, the latter with pointed exopodite bearing very 

 small spine removed from end, the telson about half the 

 length of the uropod, and the hinder ventral spine of the 

 sixth abdominal segment in the male stronger than the spine 

 before it and sharp-pointed. 



Melbourne Harbour (Brit. Antarc. Exped.). 



Doubtful Species. 



L. reynaudi, Dohrn, and the form recorded by Semper 

 have been provisionally assigned in this list to L. batei and 

 L. faxoni respectively, but it is quite possible that each of 

 them represents a distinct species. 



The characters by which the species of the foregoing list 

 may be separated are shown in the following key : — 



1. Neck shorter than rest of cephalothorax. Sixth abdo- 

 minal segment more than halt' as long again as uropod. 

 Telson and uropod subequal. [Eye-stalk stout. Legs 

 short.] L. ucicularis, Dana, 1852. 



* I am kindly permitted to include in the present paper a preliminary 

 diagnosis of this species. It is founded on specimens in the ' Terra 

 Is* ova' collection of Decapoda, which has been placed in my hands for 

 examination. 



