from the Gulf of California, etc. 401 
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, postice truncata, albida epidermide tenui lutescente 
induta; apicibus submedianis, tumidis, attigentibus; valvis ventricosis radiatim 
costatis nisi ad marginem dorsalem anticalem ; costis 42 rotundatis eanali pro- 
fundo sejunctis, et aculeis prostratis ad angulum anticum armatis, postremis 
fornieatis; 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 half the 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- 
Tower 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 distinetly grooved, exterior with- 
out fleshy tint. The portions destitute of aculei exhibit the scars 
from which they have been detached. Agrees pretty well with 
` quadrigenarium, Conr. ; color not variegated. ; 
c. blandum is smaller, the ribs transversely barred, and with no 
Indications of aculei ; the interior differently colored. 
JOURNAL B. s. N. H. 52 OCTOBER, 1853. 
