2 EDGAR A. SMITH. 



examples. It is 26 '5 millim. in length and 21 in height. The form is rather variable, 

 some shells being much longer in proportion to the height than others. The species 

 was obtained by the ' Challenger ' at Kerguelen, Marion and Prince Edward Islands. 



CARDITA ASTARTOIDES. 



Cardita astartoules, Martens ; Smith, Lamellibranchiata, ' Challenger ' Expedition, p. 212, pi. xv., figs. 2-2c. 

 Winter Quarters, 130 fathoms. 



Only young and half-grown specimens were obtained. They do not exhibit any 

 special difference from the Kerguelen examples, excepting that, in some of them, the 

 radiating riblets are rather more distinctly granose, through the more strongly marked 

 concentric striae. 



CARDITA ANTARCTICA. 

 (PL II., figs. 15, 15a.) 



Shell small, very inequilateral, moderately convex, dirty whitish, covered with a 

 thin olivaceous periostracum, sculptured with about 24 radiating riblets, which are 

 a trifle broader than the interstices, and ornamented with fine concentric waved striae, 

 some of which are more strongly marked at intervals ; lunular and escutcheon areas 

 exhibiting only growth-striae ; umbones curved over anteriorly almost to the end of 

 the shell ; hinder dorsal margin a little oblique, subrectilinear, anterior very much 

 descending ; ventral outline broadly arcuate, posterior a little curved ; interior of valves 

 white, slightly dentate at the margin ; front adductor scar long, narrow, deepish, 

 posterior much broader. A slight ridge commencing at the upper end of the anterior 

 impression curves upwards towards the umbo ; hinge normal. 



Length, 12 millim. ; height, 12 ; diam., 10. 



March 4, 1904, near Antarctic Circle, 254 fathoms, mud and stones. 



Only a single left valve was obtained. The lines of growth on crossing the 

 radiating riblets are sufficiently strong to produce a compressed subgranose appearance 

 upon the younger portion of the shell. 



The species is more inequilateral than C. velutina, Smith, from Patagonia, not 

 nearly so strongly ribbed, the ribs being more numerous and less distinctly granose. 

 The inner margin of the valves also is not so coarsely dentate. 



KELLIA SIMULANS. 

 (PL III, fig. 1.) 



Shell small, inequilateral, roundly ovate, rather swollen, subpellucid, whitish, 

 glossy, sculptured with fine striae of growth and a few rather inconspicuous radiating 

 striae, chiefly down the middle of the valves and near the ventral margin ; anterior end 

 more sharply curved and narrower than the posterior, lower outline very gently 

 arcuate; umbones antemedian, curved over to the hinge-line, rather obtuse at the 

 apex ; interior of valves faintly waved in the direction of the lines of growth, 



