312 DR. G. S. BBADT ON ENTOMOSTEACA 



rounded, posterior subtruncate ; dorsal margin feebly arched, 

 ventral almost straight ; seen from above, ovate, not twice as long 

 as broad, widest in the middle ; extremities rounded, the anterior 

 the narrower of the two. Surface of the shell smooth, marked 

 towards the front with a few faint curved, concentric grooves, 

 and thickly dotted with short hair-like papillae. Length -^q of 

 an inch ("5 millim.) 



Possibly an immature form, but not referable, I think, to any 

 described species. 



Grenus Loxoconcha, G. O. Sars. 

 Loxoco]S"CHA SAGiTTALis, n. sp. (Plate XL. figs. 19-21.) 

 Shell of the male (?), seen from the side, oblong, obliquely sub- 

 quadrangular, scarcely twice as long as high, and of nearly equal 

 height throughout ; extremities equal and obliquely rounded ; 

 dorsal and ventral margins nearly parallel, dorsal slightly 

 sinuous, ventral straight : seen from below, ovate, pointed, and 

 tapered in front ; posterior extremity wide, rounded, with a 

 central keel ; each lateral margin has just behind the middle an 

 acute-angled alseform projection, running forwards into a sharp 

 crest, and giving the anterior half of the shell the shape of an 

 arrowhead. Surface of the shell irregularly rugose and bearing 

 numerous, rather large, circular papillee. Length -^L of ^-^i i"ch 

 (•6 millim.). 



Two specimens only of this species Avere observed, — one an 

 elongated angular form, which I suppose to be the male; the 

 other shorter, broader, and more rounded in outline, probably the 

 female. 



LosocoNCHA ALATA, G. 8. Brady ? 



Loxoconcha alata, Brady, Ann. 8r Mag. Nat. Hist. ser. 4, vol. ii. (1868), 

 p. 223, pi. xiv. figs. 8-13. 



The Calpentyn specimens have a less developed lateral ala, 

 and are more coarsely punctate, but in other respects so closely 

 approach the types that it seems best to take them as belouging 

 to this species. The specimens referred in the * Challenger ' lie- 

 port to L. alata are different, and are, I think, identical with the 

 next species. 



Loxoconcha gibbeea, n. sp. (Plate XL. figs. 25-27.) 

 Loxoconcha alata, Brady, Report on the Ostracoda of the ' Challenger ' 

 Expedition, p. 122, pi. xxvii. figs. 6 a-j. 



