620 



THE VOYAGE OF H.M.S. CHALLENGER. 



First pair of pereiopoda short, strong, and chelate. Second pair long, slender, and 

 chelate, the carpos being multiarticulate. 



Length, entire, 



of carapace, 



of rostrum, 



of pleon, 



of third somite of pleon, 



of sixth somite of pleon, 



telson, . 



Habitat— Station 142, December 18, 1873; lat. 35° 4' S., long. 18°37'E.; south 

 of the Cape of Good Hope; depth, 150 fathoms; bottom, green sand; bottom temperature, 

 47°. Five specimens ; one female, the others undetermined. Dredged. 



The carapace is smooth, dorsally carinated in front of the gastric region, and anteriorly 

 produced to a rostrum that is subequal with the dorsal surface of the carapace ; it is 

 armed on the upper surface with five large teeth, the posterior standing on the gastric 

 region, and the anterior, which is smaller than the others and a little in advance of them, 

 situated about half-way between the orbital margin and the apex of the rostrum. The 

 frontal margin has a long spine-like tooth, corresponding with the outer margin of the 

 first pair of antennae, and a very minute one at the fronto-lateral angle of the 

 carapace. 



The pleon is smooth, but slightly compressed, having the third somite posteriorly 

 arcuate. The sixth somite is once and a half as long as the fifth ; the anterior three are 

 posteriorly rounded at the infero-lateral angle, and the three posterior produced to a 

 sharply pointed angle. 



The telson is subequal in length with the sixth somite, and armed laterally on the 

 dorsal surface with three small spinules on each side. 



The ophthalmopoda (fig. 4a) are short, subglobular, pyriform, and furnished with a 

 circular ocellus, situated within an indentation of the margin of the ophthalmus, with 

 which it is continuous. 



The first pair of antenna? has the first joint of the peduncle depressed on the upper 

 surface, and laterally armed with a long pointed stylocerite, that reaches to the extremity 

 of the joint, which is fringed with short hairs ; the two succeeding joints are short and 

 cylindrical, and terminate in two long, slender flagella, that are about equal in length to 

 the entire animal. 



The second pair of antennae is once and a half as long as the whole animal, and 

 carries a scaphocerite that reaches as far as the extremity of the rostrum, and is sub- 

 apically furnished with a tooth on the outer margin. 



The epistoma is deep, and the mandibles, which are embedded within the oral orifice, 

 have the large molar prominence compressed and dentated. The psalistoma is reduced 



