346 PROCEEDINGS OF t!iE ACADEMY OF 



three-fifths, and the aperture about cue-fourth the length of the 

 shell ; mouth ovate, outer lip simple, internally ribbed, Ihiclvened 

 at its upper part, turned and reflected upon the body-whorl, 



forming a callus on the upper portion of the columella, 

 Fig. 3. -which latter is rather abruptly shortened and slightly 



twisted anteriorl}'. 



Length .16. Length of aperture .06. Breadth .06. 



Hohitat. West Coast of Florida, on the shores of 

 Tampa Ba}', collected by Col. E. Jewett. Only a few 

 specimens were obtained, of which three are in my 

 cabinet. All the specimens examined by me were beach shells, 

 without opercula, consequently the generic position is somewhat 

 doubtful. This species has apparenth* relations with Nitidella 

 (N. cribraria or N. guttata), also with Truncaria (T.eurytoides), 

 but as these genera at present include many incongruous species, 

 a revision is necessarj- before this and similar forms can be satis- 

 factorily' placed. The genus Nitidella was made by Swainson 

 {vide "Treatise on Malacology," pp. 151-153-313) on the Cohim- 

 bella nitida, a West Indian shell, with a short spire, long body- 

 whorl, and a plait on the columella, a markedly different form from 

 N. guttata or N. cribraria, which are generally included with it. 

 There are numerous allied forms in this connection, which approx- 

 imate so closely that an examination of the opercula is indispen- 

 sable to generic determination. ( Vide remarks of Mr. Dall in 

 Am. Journ. Conch., vol. vii. p. 115.) 



Clathurella Jewetti, Stearns. 



Shell small, abbreviated fusiform, turreted, of a dull ashen-red- 

 dish color when dry, dark-reddish to purplish when wet; number 

 of wliorls six or seven, convex and somewhat flattened 

 Fig. 4. above, sculptured with eleven or twelve prominent lon- 

 gitudinal ribs, which extend nearly or quite to the base of 

 the body- whorl ; longitudinal ribs crossed by ten totwelve 

 strong thread-like lateral costte, which at the points of 

 crossing are in some specimens produced into rounded 

 nodules ; the upper whorls show three to four of the 

 lateral costiT?, generally three ; aperture narrow, about 

 half the length of the shell, of a purj)lish-l)lack or dark-chocolate 

 color; outer lip thickened and deeply notched above ; columella 

 nearly- straight, calloused ; terminal canal short. 



