598 •* THETIS " SCIENTIFIC RESULTS. 



followed by three spines ; second joint of palp reaching a little 

 beyond outer plate. 



First gnathopods. The side-plate distally widened, its lower 

 border serrate, with a tooth at the front corner. The fifth and 

 sixth joints are subequal both as to length and breadth, each 

 more than twice as long as broad, the palm short, sloping, not 

 sharply defined either by its angle or its palmar spine, the finger 

 curved, a little serrate, matching the palm. 



Second gnathopods longer but more slender than the first, the 

 fifth joint a little shorter than the sixth, which is more than four 

 times as long as broad, parallel-sided to the short very oblique 

 palm ; finger as in the first pair. 



The first two pairs of peraeopods are alike, slender throughout, 

 the branchial vesicles large, the marsupial plates narrow. The 

 third and fifth pairs are longer than the preceding but shorter 

 than the fourth. Like the latter they have the second joint 

 moderately expanded, narrowing downward, with serrate hind 

 margin, the finger nearly straight. 



The first uropods have the inner branch as long as the 

 peduncle, the outer a little shorter ; in the second the shorter 

 outer branch is subequal to the peduncle ; the peduncle of the 

 third is longer than that of the second, but much shorter than 

 the spinose lanceolate rami. 



The telson, considerably longer than broad, is divided almost 

 to the base. The lobes end acutely and have spines along both 

 margins. This appendage is, therefore, very different from the 

 corresponding part in Ceradocus ruhromaculatus. Length of 

 specimen 4'5mm. 



% |The specific name alludes to the smallness of both pairs of 

 gnathopods, but this will probably not afiect the still unknown 

 male sex. 



Locality. — Off Wata Mooli, depth 54-59 fathoms. 



Genus CERADOCUS, A, Costa, 



Ceradocus, A. Costa, Rend. Soc. Borbon., n, ser., ii., 1853, p. 170. 

 ■Ceradocus, Stebbing, Das Tierreich, xxi., 1906, p. 4-30. 



CERADOCUS RUBROMACULATUS (Stimpson). ' 



Stations 14, 44, 48, 49. 



■Gammarus ruhromaculatus, Stimpson, Proc. Acad. Nat. Sci. 

 Philad., vii., 1855, p. 394. 



■Ceradocus ruhromaculatus, Delia Valle, Fauna Flora Keapel, xx., 

 1893, p. 720. 



