14 THE NAUTILUS. 
of it comprises more than five-sixths of the whole surface of the 
valve and is finely obscurely reticulated by flat, little elevated, broad 
radii and faint concentric waves; much as in Cardium peramabilis. 
The epidermis rises in thin distant irregular concentric lamelle. 
The most surprising feature of the shell—which, as far as I have 
been able to discover, is not paralleled in any other species, recent 
or fossil—is the total absence of lateral teeth. | They are not obsolete 
or obscure, there is simply no trace of them; while the cardinal 
teeth are well developed and even rather long, and of the normal 
character. In the right valve the cardinal margin extends back- 
ward as a narrow angle or ridge; not elevated, but narrow like the 
mark on a piece of paper which has been opened after being folded. 
In front, on the same valve, there is nothing of this; nor on either 
side of the hinge in the other valve. 
On writing to Mr. E. A. Smith of the British Museum, he kindly 
examined the original (and still unique) type of C. Cumingi and 
reported that it has a hinge identical with our new species. 
It is very extraordinary that neither Adams nor Reeve should 
have noticed this, and no one since has observed it. 
The new form which will be called C. (Lophocardium) Annette, 
will be more fully described and figured in the “ Report-on the 
Albatross Voyage,” now in preparation. 
It contained the soft parts which resemble those of other Cardiums 
except that the siphonal septum is remarkably prolonged forward, 
to and around the foot thus separating the mantle-cavity below the 
visceral mass, into an anal anda branchial chamber. The septum is 
membranous, thin, and only perforated for the passage of the foot. 
The gills are large and normal. 
It is evident therefore that the section Lophocardium will take 
subgeneric rank in the genus Cardium, and be characterized by the 
absence of lateral teeth, the prolonged siphonal septum, and the 
prominent radial lamina. Both the species now known are from the 
west coast of subtropical America, and each represented by a single 
perfect specimen. 
A NEW CALIFORNIAN HELIX. 
BY H. A. PILSBRY. 
H. (Trropopsts) Roperr Pilsbry. 
Shell broadly umbilicated, flattened, subdiscoidal, resembling in 
