444 MARINE INVERTEBRATES 
animal of Te/lina has long, slender siphons, which are separate. 
The gills are small, and the outer lamella or branchial fold is 
directed dorsally. Although the foot shows evidences of a bys- 
sogenous gland, thére is no actual byssus. The shells are por- 
celanous and translucent, equivalve, with an external ligament, 
and at least two cardinal teeth in each valve. 
T. radiata. This species varies from three to four inches in length, 
and from one and a half to one and three fourths inches in height. It is 
highly polished, shining white, and yellowish about the umbonal region, 
and has three wide rays of bright pink extending from the beaks to the 
ventral margin. On account of its remarkable coloration it is called the 
“ setting-sun shell.” Its surface is smooth. A common variety is of a 
uniform creamy-white color with carnation beaks. This shell is always 
offered for sale by the marine curio- and shell-dealers in Florida seaside 
resorts, and at Atlantic City, Cape May, and elsewhere. 
T. alternata resembles the last in shape, being flattish and oblong, 
but it is more pointed or angulated posteriorly. There is also a slight 
twist in the posterior end of the shell. Its surface is decorated by nu- 
merous impressed concentric lines. The color is uniformly white or yel- 
lowish, with pink rays. Length two and a half to three inches; height 
two and a half inches. Found from Hatteras to the Gulf of Mexico, in 
shallow, sandy stations and on beaches after storms. (Plate LXXXI.) 
T. bodegensis. The most striking species of Tellina found on the 
west coast, and of rather northern range. It is about two inches in 
length, creamy-white in color, and ornamented with very fine concentric 
lines. <A very characteristic feature of the genus is present in this spe- 
cies as in the last, namely, a slight twist or bend to one side in the pos- 
terior end of the shell. 
T. tenera. A little Tellina 
i) found in New England waters, 
< a which, though very small, is 
: : SS worthy of mention on account 
Tellina tenera, showing ex- ; ll 
tended’ animal. > Teltina tenera. Of its abundance upon all our 
: beaches north of Hatteras. It 
is only about half an inch long, and slightly over one quarter of an inch 
high. It may be distinguished by its general generic characters, its 
iridescent surface, and its delicately marked lines of growth; some- 
times it is rose-tinted. Its remarkably long siphons are shown in the 
accompanying figure. 
Genus Macoma 
M. secta. A very pretty thin glossy shell from two to three inches in 
length and about one fourth less in height, which occurs from Monterey 
southward. The posterior end of the shell is contracted and slightly 
bent; the pallial sinus is deep. There is an external ligament. (Plate 
LXXXI.) 
M.nasuta. Another Californian species, with a less shining surface 
and a very thin light-brownish epidermis. The twisting of the posterior 
