FAMILY LEPAD.E — OTION. 257 



GENUS OTION. Leach. 



Animal with two corneous ear-shaped tubes directed backwards, truncated, open at their 

 points, and placed in the edge of the mantle, having a lateral opening, with many ciliated 

 and articulated arms. Shell consisting of two small testaceous semilunar valves only, near 

 the lateral opening. 



Otion blainvillii. 

 ("state collection.) 



Otion blainvillii. Lam. An. sans. vert. Vol. 2, p. 503. Ed. Brux. 

 Aurifire. Blainville, Diet, des So. Nat. Vol. 3, p. 135, supplement. 



Description. Body swollen and pointed ; aperture sub elliptical. The two ear-shaped tubes 

 are irregularly cylindrical, nearly as long as the body, with openings at their extremities. 

 Cirri disposed round a common centre. I did not notice the lower aperture in the right tube, 

 observed by Blainville. Peduncle twice the length of the body, and attached by a wide 

 coriaceous disk. 



Color. The markings similar to those of C. vittata ; the body is, however, more of a dark 

 purple : peduncle and body with dark fulvous stripes ; ears white and spotted ; cirri dark 

 brown. 



Total length, 2'0; of body, 0-8; of ears, 0-5. 



Associated with the preceding on ships' bottoms in the harbor of New- York, and, like all 

 the family, may be considered as introduced species. 



{EXTRA-LIMITAL.) 



O. cuvieri, Leach. (Gould, 1. c. p. 23.) Body a smooth leathery membrane, with a small crescent- 

 shaped valve on each side of the aperture. Color, leaden brown, unspotted. Length, 2 •0-4-0. 

 Vessels' bottoms. Massachusetts. 



Fauna— Part 6. 33 



