898 



THE VOYAGE OF H.M.S. CHALLENGER. 



The first pair of antennae is scarcely as long as the ophthalmopod, and terminates in 

 two subequal flagella, the outer of which is slightly larger than the inner. The peduncle 

 which supports them is about half the length of the ophthalmopod ; the first joint is very 

 long and the other two are short. 



The second pair of antennae has a scaphocerite that is a little shorter than the 

 peduncle of the first pair, rounded at the extremity, and has the inner margin fringed 

 with hairs ; the flagellum is longer than the scaphocerite. 



The mandible has no synaphipod ; the psalistoma is long and digitally serrate, and 

 the molar tubercle is robust. The supplementary oral appendages have not been 

 accurately determined. 



The first pair of gnathopoda is short and subpediform, but all the other appendages of 

 the pereion with their ecphyses are broken off, but the remaining joints of the posterior 

 pair indicate a larger organ than those anterior to it. 



The pleopoda, except the first, which is single, are developed as short biramous 

 appendages ; the posterior pair is about once and a half as long as the telson. 



Eretmocaris stylorostris, n. sp. (PI. CXL V. fig. 3). 



Carapace one-fourth the length of the animal, dorsally armed on the frontal region 

 with a sharply pointed tooth, and anteriorly produced to a smooth rostrum that is about 

 one-third the length of the carapace. 



Pleon dorsally smooth ; sixth somite twice the length of the fifth. 



Telson two-thirds the length of the sixth somite. 



Ophthalmopoda once and a half as long as the carapace. 



First pair of antennas about half the length of the animal. 



Second pair of antennas having the scaphocerite subequal with the length of the 

 peduncle of the first pair. 



Appendages of the pereion long and cylindrical ; each being furnished with long 

 basecphyses. 



Habitat. — April 26, 1876 ; off Cape Verde Islands ; taken at the surface. 



The carapace is about one-fourth the length of the animal, armed on the dorso-frontal 

 region with a strong horizontally directed tooth, and anteriorly produced to a long and 



