160 On the Mollusca of Long Island. 



species. Alive in two fathoms mud. A good many specimens 

 obtained from accumulations of C. Sayi, etc. 



51. yEolis vermiferus {n. s.). One specimen was found at 

 low water mark, on the 17th of November. It was half an inch 

 long. Back greyish white, thickly spotted with greenish grey, 

 with a deep orange colored spot between the oral tentacles, a 

 second long and narrow one, wider in the middle, extending 

 from the dorsal tentacles to the first clusters of papillae, and 

 a third between the first and second clusters, having the form 

 of an isosceles triangle with hollowed sides, whose base hne, of 

 a deeper orange, was on the median line of the back, and the 

 apex was situated on the side, half way between the upper and 

 lower surfaces. Under the tentacles, on the leftside, another 

 orange line existed. The anterior half of the lower surface was 

 white, the posterior half light salmon color, showing through 

 the foot. Foot long, narrow, white, nearly transparent, pointed 

 behind, and horned in front. Tentacles four, the oral the 

 longest. Eight clusters of papillae, with four or five in each 

 cluster, transparent white, filled with dark grey, apparently 

 foecal matter ; very irregular in diameter and length. The 

 name I propose alludes to the worm-like appearance of these 

 bunches of grey papillae. 



liamellibranchiata. 



52. Ostrea horealis Lamarck. I have been assured by the fish- 

 ermen that the oyster is indigenous to some parts of the Bays, 

 but I have only once found it under such circumstances as to 

 render it probable that the specimens were not introduced ones. 

 In the eastern part of Peconic Bay I found an extensive bed of 

 dead shells of very large size, perforated throughout by boring 

 sponges. 



