REPORT ON THE CRUSTACEA MACRURA. 



523 



decided tooth in the median line at the anterior extremity of that region, in species 

 of this genus, the teeth along the median line of the pleon are generally so connected 

 longitudinally that when the animal is extended they form a distinct carina, continuous 

 from the anterior margin of the first somite of the pleon to that of the telson. In this 

 species there is no elevation that can be called a tooth, or any ridge capable of 

 being denominated a carina, excepting at the posterior extremity of the sixth somite, 

 which, is prolonged to a strong point. The median tooth on the frontal margin of the 

 first somite exists only as an elevation of no great importance, and apparently valueless 

 in checking the backward strike of the pleon ; all the other somites have the ridge reduced 

 to a mere thickening of the central tissue, and the tuberculations are reduced to smooth 

 prominences, most conspicuous on the coxal plates. 



The first pair of antennas has the peduncle about half the length of the rostrum and 

 subequal with the scaphocerite ; the outer flagellum does not appear to be conspicuously 

 larger in the male than in the female. 



The number of specimens taken shows the gregarious habit of the species. The 

 fully grown females were generally laden with ova, and are mostly about one-seventh 

 larger than the males. 



Glyphocrangon rimapes, u. sp. (PI. XCIV. fig. 4). 



Like Glyphocrangon granulosis, but armed with three teeth on each side of the 

 rostrum, and having the dactylos of the posterior pair of pereiopoda terminating in a 

 bifid or cleft extremity. 



Habitat.— Station 300, December 17, 1875; lat. 33° 42' S., long. 78° 18' W.; 

 near Juan Fernandez; depth, 1375 fathoms ; bottom, Globigerina ooze ; bottom tempe- 

 rature, 35°5. Two specimens ; female. Trawled. 



Station 237, June 17, 1874; lat. 34° 37' N., long. 140° 32' E.; near Yokohama: 



