872 



THE VOYAGE OF H.M.S. CHALLENGER. 



The pleopocla are subequal in length and correspond in form with those of Pasiphtea 

 cristata. 



The telson is shorter than the plates of the rhipidura. 



Habitat— Station 311, January 11, 1876; lat. 52° 45' 30" S., long. 73° 46' G"W.; 

 off Port Churruca, Patagonia ; depth, 245 fathoms ; bottom, blue mud ; bottom tempera- 

 ture, 46°'0. One specimen. Trawled. 



Station 236, June 5, 1875 ; lat. 34° 58' N., long. 139° 29' E.; south of Japan ; 

 depth, 775 fathoms ; bottom, green mud ; bottom temperature, 37°"6. One specimen. 

 Trawled. 



Orphania, 1 n. gen. 



Carapace more than one-third the length of the animal, anteriorly produced to a 

 rostral point. Frontal crest not adorned with a strong tooth. 



Ophthalmopoda well developed. 



First pair of antennae biflagellate. 



Second pair of antennae supporting a foliaceous scaphocerite. 



Second pair of gnathopoda pediform. 



First two pairs of pereiopoda slender and chelate. Second pair longer than the first. 

 Three succeeding pairs feeble. 



Five anterior somites of pleon subecpial ; sixth longer than the preceding. 



Telson tapering to a point. 



Orphania tenuimana, n. sp. (PI. CXLI. fig. 4). 



Carapace about one-third of the entire length of the animal, dorsally subcarinated, 

 anteriorly produced to a small point. Orbit well denned. 



Pleon dorsally rounded ; anterior five somites subecpial, sixth subequal with the two 

 preceding. 



Telson long, slender, and tapering to a sharp point, armed with a small tooth on each 

 side. 



1 '<>»$«»/«, the condition of an orphan. 



