REPORT ON THE CRUSTACEA MACRURA. 321 



Hepomadus glacialis, Spence Bate (PI. LIL). 

 Hepomadits glacialis, Sp. B., loc. oit., p. 190. 



Rostrum broken off short ; the base of a small tooth exists on the dorsal crest just 

 behind the orbital margin. Dorsal surface of the carapace compressed, elevated, and 

 surmounted by a small carina that commences just anterior to the cardiac region and 

 continues to the rostral projection. The inner antennal tooth is well defined, but not so 

 large nor so conspicuous as the outer antennal tooth. The hepatic tooth is large, sharp, 

 and distinct. 



The pleon is compressed, and has the third somite posteriorly produced to a well- 

 defined sharp tooth that reaches nearly to half the length of the fourth somite, which is 

 posteriorly produced dorsally to a small tooth, as is also the fifth somite, where it is still 

 smaller. The sixth also carries a small terminal point. The telson is broken near 

 the distal extremity. 



The ophthalmopoda project from the lateral extremities of a conspicuous somite and 

 are uniarticulate, slender, flattened dorsally, and have an ophthalmus that is not much 

 broader than the peduncle. 



The first pair of antennae has the stylocerite reaching to the extremity of the first 

 joint and the prosartema thickly tufted with hairs. The upper flagellum is short, about 

 the length of the two last joints of the peduncle ; the lower is slender and was probably 

 very long, but is broken off at the length of the carapace. 



The second pair is also damaged, the peduncle alone being jtreserved ; the scaphocerite 

 which is broad and foliaceous is strengthened by a riclge on the outer side that terminates 

 in a small sharp tooth ; the flagellum is broken off short ; a sharp, strong tooth arms 

 the outer side of the second joint of the peduncle, and the first joint or coxa carries a 

 phymacerite on the inner side, just in front of the epistoma, which is produced to a point 

 anteriorly and posteriorly supports the broad and movable chefloglossa. 



The mandible (d) has a broad, curved, lunate, incisive margin, and a large, smooth, 

 molar protuberance ; the synaphipod is two-jointed, having the second joint shorter than 

 the first and excavated on the inner side. 



The two pairs of oral appendages that succeed the mandibles are thin, foliaceous, and 

 resemble those of Aristeus armatus, while the next (g) differs from that in Aristeus in 

 having the outer branch long, and terminating in a slender extremity, and in this respect 

 it resembles more nearly the same appendage in Benthesicymus crenatus. 



The first pair of gnathopoda is short, subpediform, and consists of six joints. The 

 coxa carries a short and broad mastigobranchia, to which a podobranchial plume is 

 attached ; the basis supports a long, slender, two-jointed ecphysis, that is as long as the 

 gnathopod, the first joint being very short and the second multiarticulate : the ischium 

 appears to be confluent with the basis (thus making one joint), and only definable by a 



(ZOOL. CHALL. EXP. — PAET LII. — 1886.) Fff 41 



