848 



THE VOYAGE OF H.M.S. CHALLENGER. 



The first pair of gnathopoda is subpediform and seven-jointed; the coxal joint 

 supports a mastigobranchia and an arthrobranchial plume, and the basis an ecphysis ; 

 the two terminal joints are reflexed against the preceding. 



The second pair of gnathopoda is pediform and five-jointed, the last two joints 

 articulating with the preceding at the inferior angle of the distal extremity ; the coxa 

 carries a small mastigobranchia and an arthrobranchial plume ; the basis supports a 

 slender and moderately long ecphysis ; the next two joints coalesce and are long and 

 curved, and the terminal two are straight and fringed with long hairs. 



The first two pairs of pereiopoda are slender, short, and subequally chelate ; the 

 next three pairs are slender and simple. 



The pleopoda are biramose, the first pair having the inner branch in the form of a 

 petasma. 



The telson is damaged in the typical specimen, but appears to be long, slender, and 

 tapering, having the sides depressed. 



Habitat.— Station 159, March 10, 1874; lat. 47° 25' S., long. 130° 22' E.; south of 

 Australia; depth, 2150 fathoms; bottom, Globigerina ooze; bottom temperature, 34°'5. 

 One specimen, male. Trawled. 



Station 215, February 12, 1875; lat. 4° 19' N., long. 130° 15' E.; south of the 

 Philippines; depth, 2550 fathoms; bottom, red clay; bottom temperature, 35°"4. One 

 specimen, damaged. Trawled. 



Hymenodora mollicutis, n. sp. (PI. CXXXVII. fig. 2). 



Carapace smooth and slightly compressed anteriorly, a small carina traverses the frontal 

 region in the median line, and projects anteriorly as a rostrum in the form of a small tooth. 

 The dorsal surface of the pleon is smooth, without any sign of a carina or dental pro- 

 jection. 



The ophthalmopoda are stout and flat and carry the tubercular protuberance distally 

 on the inner side, near the ophthalmus, which is of a fawn or pale yellow colour. 



The first pair of antennas has the peduncle stout and deeply excavate at the base, 

 and terminates in two flagella, of which the upper is much stouter than the lower. 



The second pair of gnathopoda is robust and styliform. 



