148 On ITymcnosoma deprcssum. 



the figures, will, I 1i(^[h% facilitate its identlficatioti in the 

 futme. 



Ilymenosoma depres.tum, Jacqiiiuot and Lucas. 

 (PI. V. figs. 1-4.) 



Ifi/menosoma depresmjn, Jacquinot nnd Lucas, Voy. Pole Sud, Zool. 

 iii. Crustnct^s, p. 62, pi. v. tigs. 34-39. 



Male. — Carapace nearly circular, very slightly longer than 

 broad ; flat, depressed, lateral margins without teeth ; the 

 slightly raised margin of carapace continued over the base of 

 the rostrum. Rostrum short, not longer than the eyes, 

 narrowing to the subacute extremity ; orbits not interrupting 

 the n)argin of the carapace, the lateral portion of the orbit 

 separated by a slight cleft from the upper portion, so that the 

 lateral portion in dorsal view gives almost the appearance of 

 a small tooth outside the eyes *. 



Anterior legs (chelge) rather short, only moderately en- 

 larged ; meros and carpus with inner surface supplied with a 

 few short scattered hairs, outer surface smooth ; propod with 

 inner surface nearly flat, with short scattered iiairs which 

 extend along the lower border of the fixed finger, outer surface 

 strongly convex, smooth ; fingers slender, their inner surfaces 

 with short setae, fixed finger with a small tooth near the base, 

 movable finger with a larger tooth placed a little more 

 distally, tlie rest of the opposing margins with small irregular 

 teeth, that of the movable finger also bearing small tufts of 

 setjp. 



Tne succeeding four pairs of legs of approximately equal 

 length, greatly elongated, fully two and a half times as long 

 as the carapace, slender, witho.it spines j the meros con- 

 siderably longer than any of the other joints except the 

 propod; the carpus about half as long as the propod; dactyl 

 slender and acute, slightly longer than the propod ; in all 

 the legs the proximal joints bear a few scattered setae, while 

 a continuous row of closely-packed sette fringes the hinder 

 margin of the three or four distal j >ints, the setae being 

 longer than the joint is wide. 



Aljdonien of male short, triangular, only slightly longer 

 than its breadth at the base, and reaching only to the poste- 

 rior margin of the sternum corresponding to the fourth pair 

 of legs. 



Length of carapace (without rostrum) 12*5 mm., breadth 



♦ Tliese poiuts are not well sho-\vn in fig. 1 ; an attempt has been made 

 to show theui more accurately in fig. 2. 



