

:;:'! Report on, th< Mollwca of Long Island, ffi. )'.. 



The- shell belongs to the section " JElephantukvm " of the genus 

 w», as divided by Carpenter, Tt has about twenty-four some- 

 what rounded Longitudinal ribs or lirae, crossed by numerous 

 rings, rather obscure about the middle of the shell, bul very 

 distinct at the two extremities, where the longitudinal ribs 

 become indistinct. There is a slight constriction near the 

 mouth of the shell, which swells <>ut again beyond it. Plug 

 mucronate, with the apex inclining to the left, when looking 

 .it the hack of the shell. The lateral profile is concave, rising rapidly 

 towards the hack. Operculum concave Length, 0.13 inch: width 

 in middle, .035 inch. The shell is white, not very thin, and mod- 

 erately curved. In possessing both Longitudinal ribs and rings this 

 species resembles Caecum (Elepkcunfadwrn) plicatum of Carpenter, 

 from the West Indies, which, however, is smaller, and appears from 

 the description to have a much longer plug, symmetrically placed on 

 the end of the shell. It does not appear to agree with the descrip- 

 tion of C. imbi , icatum } Carp., with which .Mr. Carpenter, unable, 

 however, to make a direct comparison, thought it might be identical. 

 Two specimens were dredged in four or five fathoms sand in the 

 northern part of Gardiner's Bay. 



94. Cerithium Sayi, Menke. Abundant in all hays. 

 Range N. Carolina to N'o\;i Scotia. 



95. < '< rithii'iH GreeniiyC. B. Adams. Canarsie, Huntington, and 

 Greenport. Hare. 



Range Bermuda : S. < iarolina to Boston. 



96. Certikivm nigrocinctum, C. B. Adams. Canarsie, Huntington, 

 ,,n<! Greenport. Rare. Low water to ten fathoms. 



Range S. Carolina to Buzzard's Bay. 



Vermel idae* 



'.•7. Vermelus radicida. St. One dead specimen at Greenport. 

 Range Florida to Buzzard's Bay. 



Scalariadae. 



v ,,/,,,/,, Uneata, Bay. Gowanus, Yellowhook, Glencove (Fer- 

 .Mi on j. 1 1 Mm ington, and 1 1 1 eenport . Rare. 

 Rangi G ;ia to Buzzard's Baj . 



