FAMILY LEPADE — ANATIFA. 255 
ANATIFA VITREA. 
PLATE XXXIV. FIG. 316. 
Anatifa vitrea. Lam. An. sans vert. Vol. 2, p. 500. 
A, id. WuEaTLey, Catalogue of Shells of the United States, p. 4. 
Description. Shell exceedingly thin and fragile, translucent, papyraceous, short triangular ; 
the dorsal valve forming a distinct angle behind, dilated and enlarged towards the base. Sur- 
face of the valves with faint incremental lines. Peduncle short. 
Height, 0+8. Width of base, 0:5. 
This was one of the largest of several hundred specimens attached to each other, and to a 
mass of seaweed floating near the Quarantine ground in the harbor of New-York, in the 
month of July. It was observed by Mr. Charles Wheatley. The smallest did not exceed 
0°3 in height. 
ANATIFA DENTATA. 
PLATE XXXIV. FIG. 317. 
(STATE COLLECTION.) 
Anatifa dentate. Bruc. No.3. Lam. An. sans vert. Vol. 2, p. 500. 
A. id. Dittwyn, Cat. 32, Govuxp, Invertebrata of Mass. p. 21, fig. 11. 
Description. Shell with the valves more robust than the preceding; the laterai valves with 
an elevated ridge from the base to the summit, over which are angulated parallel strie. Apex 
obliquely truncated. Dorsal valve sharp, compressed, with ten to twelve distinct serrated 
dentations. 
Color, opake white. 
Height, 1°1. Width of base, 0°4. 
This ‘species I have obtained from the bottoms of vessels in the harbor of New-York. 
ANATIFA LAVIS. 
Anatifa levis. Bruc. Ency. Math. p. 166, fig. 1. 
Lepas anatifera, Lin. Syst. Nat. p. 1109. 
Anatifa levis. GouLp, Invertebrata of Mass. p. 19; woodcut, p. 11. a 
Description. Shell with the lower valves triangular, rather obtuse at the summit, slightly 
wrinkled by the lines of growth, crossed by very faint radiating lines: upper valves triangu- 
lar, narrow, pointing downward; tip blunted, and leaving quite a large space occupied only 
by a membrane. Very near the apex is a distinct angle at the back: apex rounded ; back 
valve rather broad, not much compressed, sometimes grooved lengthwise. 
