38 THE VOYAGE OF H.M.S. CHALLENGER. 



from above, the shape is ovate, rather more than twice as long as broad, widest in front 

 of the middle, and acuminate at the extremities ; end view broadly ovate. Surface of 

 the shell perfectly smooth. Length, l-30th of an inch ('85 mm.). 



The foregoing description applies to the female carapace, which I suppose to be 

 represented by the figures a-c, the form figured at d being probably the male of the same 

 species. Forms found in the Antwerp Crag differing from each other in almost pre- 

 cisely the same way, and agreeing very closely with those here described, I have, 

 through the kindness of M. Ernest Vanden Broeck, already had the op]3ortunity of 

 describing ; the Challenger specimens are, however, somewhat larger. The following 

 dredgings yielded specimens which I refer to this species : males, ofi" East Moncoeur 

 Island, Bass Strait (Station 162), 38 to 40 fathoms, sand; females, ofi" Reefs, Honolulu, 

 40 fathoms. 



[PI. I. fig. 4, a-d. a Shell of female seen from left side, h from below, c from front, 

 d male seen from left side. All magnified 40 diameters.] 



4. Pontocyioris attenuata, G-. S. Brady (PI. XV. fig. 2, a-d). 



Pontocypi-is attenuata, Brady, Ann. and Mag. Nat. Hist., ser. 4, voL ii. 1868, p. 179, pi. iv. figs. 

 11-14. 



Carapace compressed, elongated, siliquose ; seen from the side subtriangular, much 

 higher in front than behind, height scarcely equal to half the length ; anterior 

 extremity broadly rounded, posterior attenuated, and tapering to a narrowly-rounded 

 point ; dorsal margin elevated, and subangular in front of the middle, thence sloping 

 gently towards the front, steeply and almost in a straight line backwards ; ventral 

 margin deeply sinuated in front of the middle ; seen from above, the oiitline is com- 

 pressed, lanceolate, widest in front of the middle, extremities acuminate, greatest width 

 equal to about one-third of the length ; end view ovate ; surface of the shell quite 

 smooth. Length, l-43d of an inch ("57 mm.). 



Found in anchor-mud, from a depth of 7 fathoms, in Hong-kong Harbour and in Hum- 

 Ijoldt Bay, Papua, 37 fathoms. The type-specimens were from Mauritius. 



[PL XV. fig. 2, a-d. a Carapace seen from left side, h from above, c from below, d 

 from front. All magnified 60 diameters.] 



5. Pontocypris (?) suhreuiformis, n. sp. (PI. XV. fig. 6, a-d). 



Carapace, as seen from the side, subreniform, highest in the middle, height equal to 

 somewhat more than half the length ; anterior extremity rounded, somewhat de]Dressed, 

 posterior broad, rather flattened, rounded off" above and below ; dorsal margin very boldly 

 arched, almost gibl^ous in the middle where it is highest ; ventral margin, very slightly 

 sinuated ; seen from above the outline is evenly ovate, widest in the middle, extremities 

 rounded off", the anterior much the narrower of the two, greatest width equal to more 



