284 DISCOVERY REPORTS 



First pedigerous somite concealed at the sides; the second somite long. 



First antenna with two-jointed flagellum, bearing two aesthetascs ; accessory flagellum rudimentary. 

 Basis of third maxilliped twice as long as the remainder of the appendage, with its distal extension 

 reaching to the end of the merus. First peraeopod with the last two joints reaching beyond the end of 

 the pseudorostrum ; basis about i| as long as the remaining joints together; carpus nearly twice the 

 length of the propodus, which is about the same length as the dactylus. Second peraeopod with six 

 joints. Exopods present only on the first pair. Uropods slender, the peduncle about z\ as long as the 

 rami, of which the exopod is slightly the longer; endopod one-jointed; the peduncle with hyaline 

 serrations on the inner edge, interspersed with about twelve short setae; exopod with six plumose 

 setae on the inner edge and ending in two spines ; endopod with six spines interspersed with hyaline 

 serrations on the inner edge, and two end spines. 



Colour in alcohol, yellowish-white. 



This species seems to be near to B. siamensis Caiman, which it resembles in the absence of lateral 

 ridges on the pedigerous somites, but the peduncle of the uropods is much longer in proportion to the 

 rami and the second joint of the first peraeopod is longer than the rest of the appendage. 



Genus Upselaspis gen.n. 

 Carapace smooth without carinae. First pedigerous somite not visible from above, the second not 

 much longer than the following. First antenna with accessory flagellum. Only the first peraeopod 

 provided with an exopod (male and female). The second peraeopod with the basis and ischium fused. 

 The inner ramus of the uropod with two joints. 



Upselaspis caparti (Fage). 

 Fage, 19516, p. 5. 

 Occurrence : 



St. WS 981, 50-0 m., i9c?c?, 20$$ (2 ovig.), 3 juv., day station. 

 St. WS 982, 100-0 m., IS-, day station. 



This species was placed by Fage in the genus Cyclaspoides Bonnier, with the proviso that it might be 

 necessary to propose a new genus for it when C. sarsi Bonnier became better known. I have examined 

 three out of four specimens of C. sarsi from the British Museum (Natural History), for which I am 

 indebted to Dr I. Gordon, and it seems to me that the differences between that species and Fage's 

 species U. caparti are too great for them to be placed in the same genus. Fage lists a number of these 

 differences (195 ib, p. 9), to which may be added the following: C. sarsi is much more slender when 

 viewed dorsally; the gut is coiled anteriorly, but is straight in Upselaspis caparti; the telsonic somite in 

 C. sarsi is produced nearly half-way along the peduncle of the uropods, but is not produced in 

 U. caparti; the endopod of the uropod in C. sarsi is one-jointed, ending in a spine much narrower 

 than the breadth of the joint at its end, while I consider the endopod of U. caparti to be two-jointed, 

 as Fage thought possible, because the second joint is almost as broad at its proximal end as the distal 

 end of the first joint ; its inner margin is finely serrated, and it ends in a spine, while in the male it 

 bears two or three plumose setae on the inner edge proximally. 



Generically the important difference between the two species is that in Cyclaspoides sarsi the first 

 three pedigerous somites are fused with the carapace in both sexes, while in Upselaspis caparti only the 

 first pedigerous somite is fused in the female and the first and second in the male. 



Upselaspis is distinguished from Cyclaspis by the presence of six joints in the second peraeopod, and 

 from Bodotria by the shorter second pedigerous somite. 



The species was obtained in almost the same locality as the original find reported by Fage. 



