358 MARINE INVERTEBRATES 
extreme southern Florida. F. barbadensis has heavy longitudinal ribs and 
is light green within, with a rosy circle about the apical perforation. 
(Plate LXV.) 
Genus Glyphis 
G. aspersa. One of the numerous species belonging to this family 
which are found on the west coast of the United States. It is about one 
and a half inches long, grayish-white, with sharply raised longitudinal 
ridges, slightly rayed, crossed by revolving ribs, which give to the 
outer surface a decussated appearance. The apex is forward of the 
center, and is entirely replaced by a round perforation. The edge is 
wrinkled, and within smooth and white. 
Genus Lucapina 
L. crenulata. The largest of the keyhole-limpets; the shell is often 
four inches in length, while the animal, with its huge yellowish foot and 
dark-colored mantle, which is thrown back, almost concealing the shell 
upon its back, is much larger. The apical perforation is very large. Shell 
flattened, with radiating, rounded, crowded ribs; brownish-white in 
color; edge crenulated; within pure white. It is found at Monterey, but 
live specimens are not very frequently seen near the beach. (Plate 
LXVI.) 
FAMILY HALIOTIDE 
Genus Haliotis 
This family is closely allied to the Fissurellide. The species are 
known on the Pacific coast by the name of abalone shells, and in 
England and the Channel Islands as ormers or sea-ears. There 
are no species of Haliotis on the east coast of the United. States, 
but one has recently been dredged at a considerable depth in West 
Indian waters. This family, with the last, possesses the striking 
anatomical feature of having the heart traversed by the digestive 
tract. It also has two gills, the degree of torsion in the visceral 
mass not being sufficient to have crowded out and destroyed the 
original right gill. The shell is spiral, but is so greatly flattened, 
and the body-whorl is so greatly extended, that the shell quite 
loses the spiral appearance. Along the dorsal side of the shell is 
a row of holes, through which project numerous tentacular pro- 
cesses from the mantle. The outer surface of the shell, before itis 
polished, is usually rough and unattractive, but within, when the 
