DORYCEPHALUS LlNDSTROEMI. 77 



mens, I have not ventured to unite the two species under one name, 

 though I was at first much disposed to do so. 



The body is more compressed and slender than in the genus 

 Oxycephalus, the thin integument shows, especially on the peraeon, small 

 pits and excavations, round, or oblong, or S-shaped, probably occupied 

 by cutaneous glands. 



The rostrum is considerably longer than a third part of the length 

 of the whole head. The ocular region is more evenly egg-shaped in the 

 female than in the male. 



The first pair of antennce in the male have the lower front corner 

 of the first flagellar joint produced into a narrowly conical process, which 

 is as long as the breadth of the joint. The last three flagellar joints 

 together are scarcely as long as a third part of the under margin of the 

 first joint; the second joint is as long as the third, the fourth is a little 

 longer than the first, and is very slender. The second pair in the male 

 have the first three joints almost equal in length; the fourth is a little 

 shorter than the third, but is twenty-four times as long as the fifth or 

 last joint (p. 27, fig. 31). 



The first pair of perceopoda (p. 33, fig. 56) have the femur 

 nearly as long as the four following joints together; the lower margin 

 of the tibia is finely serrated; the carpus is only a little produced, with 

 the under margin sparingly serrated; the front margin of the meta- 

 carpus is- strongly convex, the hind margin is straight forming an edge, 

 which is serrated only at the lower corner, with six or seven spine-like 

 teeth; the dactylus is short, curved, with a small tooth on the hind 

 margin, and is a third part as long as the metacarpus. The second pair 

 (PI. II, fig. 17) have the carpus more produced than in the first pair, but 

 still the carpal process is not half as long as the stem of the joint, and 

 the prehensile organ, formed by the carpus and metacarpus, must be 

 termed a subcheliform hand; the metacarpus is considerably shorter 

 than the stem of the carpus; its hind margin is provided with four 

 shallow notches rather than serrated, and has five or six spine-like teeth 

 at the lower corner. The third and fourth pairs are very slender, 

 the metacarpus of both pairs is a trifle shorter than the tibia. The fifth 

 pair have the femur quite as long as the three following joints together; 

 the apex is outdrawn behind the genu almost to the apex of that joint; 

 the tibia is much longer than the metacarpus, which is twice as long 

 as the dactylus. The sixth pair have the femur fully as long as, and 



