l6o TRANSACTIONS OF THE WAGNER FREE 



Section Melanella Bowdich. 

 Eulima arcuata C. B. Adams. 

 Pliocene of the Caloosahatchie. Also in the Italian Pliocene. Found liv- 

 ing on both sides of the Atlantic, and is the E. curva of Jeffreys and Monte- 

 rosato, but not the E. arcuata of Sowerby in Reeve's Iconica, 1866, which 

 is a much larger species. 



Subgenus Leiostraca H. & A. Adams. 



Eulima (Leiostraca) acuta Sowerby. 



E. acuta (Sby.) Dall, Rep. Blake Gastr., p. 32S, 1889. 

 E. bifasciota Orbigny. 



Pliocene of the Caloosahatchie. Living from the West Indies northward 

 to North Carolina, and perhaps to New England ; also on the west coast of 

 Central America. 



Eulima (Leiostraca) rectiuscula Dall. 

 L. stenostoma Dall, Bull. U. S. Nat. Mus. No. 37, p. 126, 1889, Europ. ref. excl., not of 

 Jeffreys. 



Pliocene of the Caloosahatchie beds. Living off Fernandina, Florida, in 

 294 fathoms. 



This species resembles L. stenostoma (see G. O. Sars, Moll. Reg. Arct. 

 Norv., pi. II, fig. 21), but is destitute of the constriction at the suture so char- 

 acteristic of stenostoma, having the sides of the spire straight and forming an 

 uninterrupted cone ; the shell is somewhat thicker and less translucent, the 

 coil of the whorls less oblique, the adults having one more whorl in the same 

 length of shell, while the anterior margin is less effuse than in E. stenostoma. 

 I have not seen an unmistakable stenostoma from the coast of America. 



Genus NISO Risso. 

 Niso "Willooxiana Dall. 

 Plate 5, figures 5, s b. 

 Niso Willcoxiana Dall, Rep. Blake Gastr., p. 331, 1889. 



Pliocene of the Caloosahatchie beds. 



A very perfect specimen of this shell, obtained by Mr. Willcox since the 

 above publication, shows markings as in N. splendidula Sowerby, which lives 

 on both the American coasts, and on the Atlantic side extends from North 

 Carolina to the Gulf of Mexico. The chief difference between the two forms, 

 which are doubtless genetically connected, is that the living form is smaller 

 and less expanded at the base than the fossil one. The latter has no specific 

 resemblance whatever to the Claiborne species N. umbilicata Lea, which is 

 very much smaller and with more whorls in proportion to its length, when 

 adult. 



