28 



the anterior end much more acutely rounded than in any other 

 species, the cardinal teeth much more delicate and not tinted violet ; 

 impressions much less profound. 



CARDIUM LUTEOLABRUM. 



Cardium luteolabrum, Gould; Proc. B. S. N. H.. Nov. 1851. IV. 91. 



T. magna, ovato-globosa, posticb truncata, albida epidermide tenui lutescente 

 induta; apicibus submedianis, tumidis, attigentibus ; valvis ventricosis radiatim 

 costatis nisi ad marginem dorsalem anticalem ; costis 42 rotundatis canali pro- 

 fundo sejunctis, et aculeis prostratis ad angulum anticum armatis, postremis 

 fomicatis ; intus alba, dentibus marginalibus croceo tinctis. 



Shell large, ovate globose, slightly oblique, broadly and obtusely 

 truncate posteriorly, dingy white, covered with a dirty yellow epi- 

 dermis ; beaks tumid, touching ; valves with a slight posterior um- 

 bonal angle, with forty-two rounded ribs, leaving a small plain area 

 in front of the beaks ; they are separated by deep rectangular chan- 

 nels about haWthe width of the ribs ; they are naked at the beaks 

 and centre of the disk, but the lateral ones bear on their external 

 edges oblique, somewhat seedlike aculei, which become broader and 

 almost vaulted posteriorly : interior white, with the marginal serra- 

 tures very deep and saffron colored ; grooved partially to correspond 

 with the external ribs. 



Longitudinal, vertical, and transverse diameters three and one 

 fourth, three, and two and one fourth inches. 



Inhabits San Diego. Lieut. Green. 



It would at first glance be taken for C. pseudolima, a species 

 from Zanzibar. It is more globose, less rhomboidal, the posterior 

 side shorter and less angular ; it has six more ribs, which are nar- 

 rower and more developed on each side, with deeper and more 

 abrupt grooves, and the spines are on the edge instead of the 

 centre of the ribs ; margin more strongly dentate, the denticles 

 acute instead of square, and continued round to the ligament, and 

 yellow instead of roseate ; interior distinctly grooved, exterior with- 

 out fleshy tint. The portions destitute of aculei exhibit the scars 

 from which they have been detached. Agrees pretty well with 

 C. quadrigenarium, Conr. ; color not variegated. 



C. llandum is smaller, the ribs transversely barred, and with no 

 indications of aculei ; the interior differently colored. 



