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



middle ; posterior more abruptly rounded, almost truncated, and having also a mucronate 

 process in the middle ; end view broadly ovate, wide at the base, and only slightly tapered 

 toward the dorsal margin. Surface of the shell beset with small angular fossae, which 

 have a concentric arrangement, and on the ventral surface form groves with separating 

 ridges. Specimens which I take to be the male of this species (figures e~h) are rather 

 difierent in shape, the infero-posteal angle being more decidedly rounded oif, and the 

 posterior extremity, when viewed from above, being expanded so as to give a distinct 

 sinuation to the lateral margins, the wliole outline thus getting a pretty close resemblance 

 to that of a thistle-blossom ; the sculpturing of the surface is also much coarser than in 

 the female. Length, l-55th of an inch ("46 mm.). 



Several specimens of this Cythere occurred in a dredging from a depth of 40 fathoms, 

 off the reefs at Honolulu. (Station 246.) 



[PL XIII. fig. 3, a-h. a Shell of female (?) seen from left side, h from above, c from 

 below, d from front, e shell of male (?) seen from left side, / from above, g from below, h 

 from front. All magnified 60 diameters.] 



19. Cythere crispata, G. S. Brady (PL XIV. fig. 8, a-d). 



Cythere cicatricosa, G. 0. Sars (1865), Oversigt af Norges marine Ostracoder, p. 33. 



Cythere baclia (in part), Brady (1868), Monog. Recent Brit. Ostrac, p. 399 (not figures). (Not 



C. hadia, Norman.) 

 Cythere hadia, Brady (1868), Les Fonds de la Mer, torn. i. p. 89. 

 Cythere crispata, Brady (1868), Ann. and Mag. Nat. Hist., ser. 4, vol. ii. p. 221, pL xiv. figs. 



14, 15. 

 Cythere cicatricosa, Brady and Robertson (1869), Ann. and Mag. Nat. Hist., ser. 4, vol iii. p. 



369, pi. xix. figs. 13, 14. 

 Cythere crispata, Brady, Crosskey, and Robertson (1874), Post-Tertiary Entoniostraca, p. 146, 



pi. xii. figs. 52, 53, and pi. xiii. figs. 12, 13. 



Shell, seen from the side, subquadrangular, rather higher in front than behind ; height 

 ec[ual to at least half the length ; anterior extremity obliquely rounded, posterior 

 narrower, truncated, and only very slightly rounded ; dorsal margin sloping from 

 before backwards and gently curved, ventral slightly sinuated in the middle ; 

 seen from above, the outline is compressed and irregularly subhexagonal, the greatest 

 width less than half the length ; extremities truncated, the anterior being much 

 narrower than the posterior, sides nearly parallel, but gently converging from a point in 

 front of the middle to the anterior extremity, and, near the hinder end, slightly 

 emarginate ; end view hexagonal and nearly equilateral. Shell-surface sculptured all over 

 with closely-set angular excavations of irregular form and size. Length, l-50th of an 

 inch ('5 mm.). 



Cythere crisjxtta was observed in dredgings from Port Jackson, 2 to 10 fathoms ; from 

 Booby Island, 6 to 8 fathoms, (Station 187) ; and in anchor-mud brought up from a depth 



