oo 
Py 
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CARDIUM. 
narrow, geniculated, and of flesh colour, the result of a del- 
cate and easily obliterated epidermis, under which it is pure 
white ; its length is at least twice that of the shell. There 
are a pair of semi-oval branchiz on each side, the upper one 
being as long as the lower, but not half the depth of it; they 
are pale brown and well-striated on the outer surface, but less 
so within ; the palpi are of the same colour, very long, slender, 
pointed, with decided raised vessels on the inside, though less 
marked externally. 
We subjoin a separate account of the young shell, which is 
the C. ciliare of authors, and has been considered as belonging 
to the C. aculeatum; but having had opportunities of exami- 
ning large suites of both species of }th of an inch to 24 inches 
diameter, we can confidently state that it is the young of 
this species. 
C. ECHINATUM, jun. 
C. ciliare, Auctorum ; Brit. Moll. (animal) pl. N. f. 4, as C. echinatum, 
jun. 
Animal suborbicular; the specimen examined was :ths of 
an inch diameter, pale yellow; the mantle is muscular, and 
coarsely dentated at the edge, which character in a great 
measure disappears in the older shells; it is open throughout, 
forming short tubes, the branchial one having about sixteen 
short cirrhi and minute red points at the base ; the anal siphon 
has the usual tubular retractile process and twelve cirrhi, 
which also have red points at the base; besides the siphonal 
curhi, there are above and below and on the tubes a few 
coarser white filaments, which are invariable appendages of 
all the Cardia. There are on each side the body a pair of 
pale brown roughly striated suboval branchial lamin, the 
upper beg much narrower than the under ones; the strive 
are apparent on both surfaces; the corresponding pairs of 
palpi are long, narrow, subtriangular, poimted, and rather 
more strongly striated on the inner than on the outer sides ; 
they are pale brown. The foot is very long, at least double 
the vertical measure of the shell, subeylindrical, narrow, 
pointed, angulated, and of a pale flesh colour. 
H 2 
