Che Conchologists Exchange. 
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VoL. II. 
CHESTNUT HILL, PHILADELPHIA, PA., MAR. & APR., 1888. 
No. 9. 
THE SHELL-BEARING MOLLUSCA OF 
RHODE iSLAND. 
BY HORACE F. CARPENTER. 
Chapter XLIV. 
Genus Cytherea, Lam., 1805. 
Distribution world wide. There are 
living species and So fossils. 
167.— Cytherea ( Callista) Sayiz, Conrad. 
Syns : 
Cytherea convexa, Say, Sowb., DeKay, Hanly, 
Romer, Gld., Adams, etc. 
Dione convexa, Desh., Reeve. 
@allista 4“ Dall. 
Cytherea Sayana, Conrad. 
“© Sayii, Perkins. 
150 
Shell oval, thin, convex ; surface dead white, 
chalky ; interior milk white, polished; beaks 
elevated and pointing forwards ; in front of the 
beaks is a heart-shaped lunale. Length, one 
and three-quarter inches ; height, one and one- 
half; breadth, one inch. Inhabits from New 
Jersey to Gulf of St. Lawrence. It is not an 
attractive looking shell ; it appears like a small, 
dead quahog. Say’s species, convexa, de- | 
scribed in Journ. Acad, Nat. Sci., Phila., iv, 
149, 1824, was a fossil, and occurs in the mio- 
cene of Maryland, North and South Carolina, 
etc. Authors since have called our species by 
Say’s name, supposing them to be the same, 
but Conrad, in Silliman’s Jour. xxiii, 345, 1833, 
described the recent species supposing them 
still to be identical and named it Sayana, as he | 
said Say’s name was preoccupied. In _ his 
“ Cata. of Miocene Shells,’ in Proc. Phil. 
Acad, Sci, xiv, 575, 1862, while recognizing 
Cytherea convexa as a miocene fossil, he be- 
lieves the recent species to be distinct. 
two species are identical, then Mr. Say’s name 
should stand, as convexa is not preoccupied in 
If the | 
the genus or sub-genus Callista, although it is 
in Cytherea, If they are not identical, Con- 
rad’s name is the properone. ‘These shells are 
| not very abundant in Rhode Island; dead 
shells are often found on the shores, and live 
ones are dredged off Rumstick in mud. 
168.— Cytherea (Gouldia) mactracea, Linsley. 
| Syns : 
Astarte mactracea, Linsley, Gould. 
Gouldia ce Dall., Binney, Tryon. 
Shell small, quadrant shaped; apex acute; 
anterior margin a little concave; basal margin 
rounded; surface with fourteen concentric 
valves and striated between the waves by regu- 
lar, minute, radiating lines. Color pale yellow- 
ish green, with darker shades in fine radiation, 
Length and height, each one-quarter inch ; 
breadth, one-tenth. 
This species was described from a single 
valve, found in the stomach of a haddock, at 
Stonington, Conn., by Rey. James H, Linsley, 
in Silliman’s Jour,, xlviii, 275, 1845, (name 
only), and by Dr. A. A. Gould, in the same 
journal, 233, Sept. 1848. Since dredged in 
New Bedford Harbor (Prime & Stimpson). 
Huntington and Greenport, (C. Smith), Prof. 
Verrill says: ‘ Florida and northern shores of 
the Gulf of Mexico to Cape Cod. Common, 
living and of large size, in Vineyard Sound and 
Buzzard’s Bay, especially at Wood’s Holl, 3 
to 10 fathoms.”’ It has not yet been found in 
Rhode Island. 
SUB-FAMILY MEROEINA‘) Not repre- 
sented in the 
SUB-FAMILY TAPESINA® USS: 
Sub-family Dosiniinze contains four living 
genera and four fossil, represented in New 
England by one species. 
169.—Tottenia gemma, Totten, 1834. 
Syns : 
Venus gemma, Totten, Gld., DeKay, Wood, 
Sby., etc. 
