256 TRANSACTIONS OF THE WAGNER FREE 



Turbonilla exilis C. B. Adams. 



Chemnitzia exilis C. B. Adams, Contr. to Conch., p. 74, 1850. 

 Turbonilla exilis Dall, Bull. U. S. Nat. Mus. No. 37, p. 12S, No. 594, 1889. 



Pliocene of the Caloosahatchie beds and Shell Creek, Florida, Dall and 

 Willcox; living from Cape Hatteras, N. Car., to Haiti in from 3 to 63 

 fathoms. 



The species resembles C. levis Ads., but is smaller. In some speci- 

 mens there is a feeble ridge on the pillar. 



Turbonilla stricta Verrill. 

 T. stricta Verrill, Rep. Invert. An. Vineyard Sd., p. 365, 1874. 



Pliocene of the Waccamaw beds, S. Car., Johnson ; living from Wood's 

 Holl, Mass., to Long Island Sound, and probably still farther down the coast; 

 a fragment dredged off Cape Hatteras is probably conspecific. 



Specimens of Verrill's form agree with the fossils fairly well. It must 

 be remembered, in considering the distribution of the living forms, that our 

 Southern coast is but very imperfectly explored for these minute species, and 

 most of the forms originally described from the New England coast have 

 since been found in the Carolinas. 



The specimens examined show that the ribbing tends to become obsolete 

 on the last whorls of the adult, and that an extremely feeble ridge is sometimes 

 visible on the pillar. 



The preceding species are devoid of spiral sculpture, but in those that 

 follow it exists more or less distinctly. 



Turbonilla puncta C. B. Adams, var. obsoleta Dall. 



Chemnitzia puncta C. B. Ads., Contr. Conch., p. 72, 1850. 

 Turbonilla puncta Dall, U. S. Nat. Mus. Bull. 37, p. 128, No. 593. 



Pliocene of the Caloosahatchie, Dall ; living from Cape Hatteras to Haiti 

 in 12 to 15 fathoms. 



The figure of this species given by Mr. Tryon in his Manual I have com- 

 pared with Prof. Adams's type-specimen, and find it inaccurate, as it is too 

 conical and does not show the punctures sufficiently well. 



The fossil differs from the recent shell in the feebleness of the spiral 

 sculpture, and especially in the fact that the ribs are not cut off abruptly at 

 the periphery, but diminish somewhat gradually into the smooth base of the 

 last whorl, so that the foveolate character of the interspaces is lost. But as I 

 have only one specimen, and have observed that in some of the recent forms 

 the character alluded to is not invariably constant, I have preferred to separate 

 the form varietally rather than specifically until I can examine more material. 



The pillar appears to be simple. 



