22 INVERTEBRATA OF MASSACHUSETTS. 



GENUS CINERAS, LEACH. 



This curious genus, with the next, is very singular in its ap- 

 pearance, and very easily recognised. It has the general form, 

 structure, and habits of ANATIFA, but the exterior is almost entirely 

 of a leathery texture, with only a few bony pieces at the back 

 and about the aperture. None of them are permanent residents 

 in our seas, but may be always found on foul-bottomed vessels, 

 or attached to tardy-moving fishes. The two genera CINERAS and 

 OTION, are almost always found in company, and are united in the 

 genus GYMNOLEPAS by Blainville. They are not unfrequently 

 called " the naked Cirripedes." 



CINERAS VITTATA. 



Covering leathery, angular at summit, with jive, narrow, remote 

 valves ; color whitish, with three black stripes down each side. 



State Coll., No. 257. Soc. Cab., No. 2089. 



Lepas coriacea, POLI ; Test., i. tab. 6, f. 20. 



Lepas membranacea, MONTAGU ; Lin. Trans., ii. 182, pi. 12, f. 2. 



Lepas vittata, SOLANDER ; Mss. WOOD ; Gen. Conch., 69, pi. 12, f. 2, 3. Index, 



pi. 2, f. 43. 



Senoclita fasciata, SCHUMACHER ; p. 98. GRAY ; Annals of Philos., x. 100. 

 Cineras vittata, LEACH ; Encyc. Brit., Suppl, iii. 170, pi. 57. SOWERBY ; Genera. 



LAM. ; An. sans Vert., v. 684. 

 Gymnolepas Cranchii, BLAINVILLE ; Malacol., pi. 84, f. 2. 



The exterior is of a leathery consistence, like the stem. There 

 is no distinct line of division between the pedicle and the body, 

 but the stem gradually dilates. The summit is obliquely truncate, 

 somewhat concave, and margined on each side by a bony forma- 

 tion. The aperture is also margined by two pointed pieces, and 

 a fifth piece runs down the back. Color white, with three black 

 stripes on each side, the two posterior ones uniting to form one 

 on the stem. Tentacula of the color of the stripes. Length, in- 

 cluding pedicle, often 2 inches. 



Found on the bottoms of vessels, and also on some of the large 

 sluggish fishes, as the Orthagorlscus mola. 



