it. N Be: 
VOL. IIT, JUNE, 1889. No. 2. 
NOTES ON LOPHOCARDIUM FISCHER. 
BY W. H. DALL. 
Any one who has been interested in the Cardiacea will remember 
the beautiful shell described by Adams and Reeve in the Mollusca 
of the voyage of the “Samarang,” under the name of Cardium 
Cumingi. This lovely shell is elongated, inflated, rose-red, anteriorly 
nearly smooth and posteriorly moderately sculptured. As described 
and figured the most remarkable feature is that the vertical ridge, 
which in all Cardiacea separates the generally diverse sculpture of 
the posterior area from the rest of the surface, is remarkably high 
and elevated while the rest of the sculpture is faint. No other 
species has so prominent a ridge, but nearly all species have a ridge 
of some sort. On this account Dr. Fischer in his recent Manual 
(p. 1038, 1887) proposed for this shell the sectional name of 
Lophocardium, in the subgenus Papyridea Swainson. 
On the voyage of the U. S. Fish Commission steamer Albatross 
to California, another species of Lophocardium was dredged in 25 
fathoms off the coast of Lower California, near Cerros Island. This 
shell is 30.0 mm. long and 25.5 mm. high with a maximum diameter 
ot 12 mm. It gapes behind as in Fulvia, is of a delicate salmon- 
pink, with a thin brownish epidermis. The posterior area is retic- 
ulated, the somewhat irregular concentric lamelle being sparser and 
higher than the radii, and with the epidermis produced on their 
edges. The radial bounding ridge is notched and much less prom- 
inent than in C. Cumingi, in fact is not more elevated than in many 
other Cardiacea, and is fringed with epidermis. The area in front 
