REPORT ON THE CRUSTACEA MACRURA. 323 



Length (female), 196 mm. (7 '20 in.). 



Habitat.— Station 237, June 17, 1875; lat. 34° 37' N., long. 140° 32' E. ; near 

 Yokohama ; depth, 1875 fathoms; bottom, blue mud; bottom temperature, 35°"3. One 

 specimen ; female. 



Hepomadus inermis, Spence Bate. 



Hepomadus inermis, Sp. B., loc. cit, p. 190. 



Dorsal surface unarmed. Pleon smooth. 

 Telson half the length of the outer plate of the rhipidura. 

 Length, 100 mm. (4 in.). 



Habitat— Station 289, October 23, 1875; lat. 39° 41' S., long. 131° 23' W.; South 

 Pacific; depth, 2550 fathoms; bottom, red clay; bottom temperature, 34° - 8. 



The specimen taken at this station is that which I have previously named Hepomadus 

 inermis, because there was no tooth on the dorsal crest or pleon. It is in too imperfect 

 a condition to fully describe its specific characters ; the absence of the dorsal armature 

 on the carapace may probably be due to the fracture of the rostrum, but the absence of 

 the large tooth on the third somite of the pleon demonstrates it to be specifically distinct 

 from Hepomadus glacialis. 



Peteinura, 1 n. gen. 



o 



Carapace about one-third the length of the animal, deeper posteriorly than anteriorly, 

 and produced forwards to a long and slender rostrum ; armed with a tooth near the 

 outer canthus of the orbit, another posterior to the second antennae, and others corre- 

 sponding with the upper margin of the branchial chamber. 



The five anterior somites of the pleon are subequal, the sixth is about the length of 

 the four preceding but not half the depth, and carries a pair of pleopoda that has the 

 rami very unequal, the outer being nearly as large as the animal, the other small and 

 rudimentary. 



The telson tapers to a sharp point. 



The ophthalmopoda are uniarticulate and pyriform. 



The first pair of antennae has a three-jointed peduncle and terminates in two short 

 fiagella. 



The second pair of antennae carries a long scaphocerite and a slender fiagellum. 



The second pair of gnathopoda is pediform, and terminates in a styliform dactylos. 



The first, second, and third (?) pairs of pereiopoda are imperfectly chelate, the 

 posterior two are simple. 



1 neravo;, flying, and oija, tail. 



