REPORT ON THE CRUSTACEA MACRURA. 145 



pereiopoda is imperfectly chelate in the female, the pollex being shorter than the 

 dactylos. 



Habitat.— Station 214, February 10, 1875; lat. 4° 33' N., long. 127° 6' E. ; 

 between Samboangan and New Guinea ; depth, 500 fathoms ; bottom, blue mud ; bottom 

 temperature, 41°-8. Length, 38 mm. (1'5 in.), female. 



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

 Valparaiso ; depth, 1375 fathoms ; bottom, Globigerina ooze ; bottom temperature, 

 35° - 5. Length, 47 mm. (175 in.), female. 



Although the animal is named Isevis, there is a short, sparsely-scattered fur on 

 the surface of the carapace ; but, with the exception of two small teeth on the median 

 line anterior to the cervical fissure, the dorsal surface of the carapace is free from 

 armature. The teeth on the lateral margins are very even and regular, and gradually 

 increase in importance from the posterior margin of the carapace to the anterior angle, 

 where they become tolerably large and decided. In the median line of the frontal 

 margin are two divergent upwardly-pointed rostral teeth. Outside these, on the inner 

 angle of the orbital notch, is a strong tooth pointing forwards and slightly upwards ; 

 it is serrate on the outer side. The orbital notch is narrow. The somites of the 

 pleon are dorsally smooth, and are slightly elevated into a median carina, the four 

 anterior somites of which only possess dentations (fig. 5p). 



The ophthalmopod is armed on the anterior surface with a sharp tooth. 



The first pair of antennae has the inner margin of the projecting scale of the first 

 joint of the peduncle serrate, with its anterior point reaching as far as the distal 

 extremity of the third joint of the peduncle. 



The second pair has the flagellum broken short, and has a small scaphocerite that 

 does not reach beyond the ultimate joint of the peduncle. 



The mandible and oral appendages correspond closely with those of other 

 species. 



The first pair of gnathopoda much resembles that of Stereomastis suhmi. . 



The second pair is damaged in this specimen, the joints beyond the ischium being 

 wanting ; the coxa is broad and hairy, and carries a tolerably long mastigobranchia, 

 but no branchial plume. 



The first pair of pereiopoda is broken off at the coxa, to which is attached a 

 podobranchia and a mastigobranchia, the latter being as long as the plume ; to the 

 articulation are joined two arthrobranchia?, but I could not detect a pleurobranchial 

 plume. 



The second pair of pereiopoda likewise carries a long podobranchial plume 

 and an equally important mastigobranchial plate, two arthrobranchiee, and a pleuro- 

 branchia. 



(ZOOL. CHALL. EXP. — PAET MI. — 1886.) Fff 19 



