672 CRUSTACEA. 



dish purple along the venter and in the eardrop organ, and also the 

 connected glassy organ in first abdominal segment. Length of anten- 

 nary segment more than eight times its breadth. Inner caudal 

 lamella a fourth shorter than outer lamella; outer, acute at apex, 

 naked on outer margin, ciliate within. 



Base of inner antennae about as long as antennary segment; flagel- 

 lum half as long as animal, very slender. Scale of outer antenna? 

 slender, a little longer than base of same ; flagellum longer than half 

 the animal. 



In females found with this species, and believed to be identical with 

 it, the sixth abdominal segment was entire below, without the two 

 teeth above described. 



This species has the long antennary segment of the Reynaudi ; but 

 the eyes are much longer, being in this respect nearer Thompson's 

 species, from which, however, it differs in the relative lengths of its 

 caudal segment and appendages. 



LUCIFER KEYNAUDI, Edwards. 



Plate 45, fig. 1 a, female, enlarged ; 6, profile of extremity of abdo- 

 men of same ; c, ibid, of male ; d, profile of cephalothorax of male. 



Sooloo Sea, Straits of Banca, East Indies. 



Length, five lines. The eyes in this species (as represented by 

 Milne Edwards) are not longer than half the length of the antennary 

 segment. This segment is long and slender, being full half longer 

 than the carapax. There is a spine either side at the base of each 

 abdominal pair of legs, but it is not seen in a lateral view. The 

 carapax has a spine on either shoulder, as in other species, 



In males, the sixth abdominal segment has two prominent teeth or 

 spines below ; the anterior is acute ; the posterior is always the longer, 

 and is either acute or obtuse, usually the latter. Besides these, there 

 are two minute setules just posterior to the hinder spine. The last or 

 caudal segment is but little more than half the length of the sixth 

 segment, and about two-thirds the length of the outer caudal lamellje; 

 on its under surface there is a rounded tubercle, which is isolated and 

 prominent, and inclines somewhat backward. Moreover, the males 



