50 TRANSACTIONS OF THE WAGNER FREE 



All Conrad's figures of this species are too angular and produced at the 

 shoulder where it reaches the terminal varix or outer lip. The recent shells 

 vary considerably in size and height of spire, but the latter is usually rather 

 elevated, and the shell anteriorly narrowed, while there is a peculiar aspect oi 

 the surface, something between rude and polished, which is as marked in the 

 fossil as in the recent shells, and I have seen nothing like it in any other 

 species. 



It is distinctively a Northern species, and is not found in the present waters 

 of Florida, as far as yet known. But there are several specimens from the 

 silex-beds which do not seem to differ from specimens from Virginia and 

 North Carolina of the same age, and one specimen was obtained from the 

 Miocene at White Beach near Osprey. The Caloosahatchie specimens show 

 markings like M. nivosa Hinds, which are very rare in the recent shells. 



Marg-inella rostrata Redfield. 



Marginella rostrata Redfield, Cat. Marg. Am. Journ. Conch, vi. p. 246 (note) ; Sowerby, 

 Thesaurus, Marg., plate 76, figures 106, 107 [ob/ongaSby. non Swainson). 

 Caloosahatchie beds, not common. Recent in the Gulf of Mexico in 84 



fathoms. 



These shells are mostly a little larger and heavier than the recent ones, 



though some specimens agree well with them, 



Marginella 'Willooxiana n. s. 

 Plate 5, figure 7. 



Shell long, subcylindrical, narrow, with the apex covered with callus, 

 though not entirely immersed in the last whorl ; a very obscure ridge encircles 

 the shell at about the posterior third ; terminal varix broad, straight, ex- 

 ternally marginated ; except at the extreme ends the inner edge of the outer 

 lip is minutely denticulate; aperture narrow, as long as the shell, nearly 

 straight, except for the sharp curve at the posterior commissure ; inner lip 

 very callous behind, the callus extending on and over the spire; anterior part 

 with four subequal strong plaits, the posterior plait less oblique than the 

 others ; surface of shell very polished, with no trace of color. Max. Ion. of 

 shell 16.6 ; max. lat. 7.4 mm. 



Caloosahatchie beds of the Caloosahatchie and at Shell Creek, Florida, 

 Mr. Willcox. 



This species is remarkably slender, narrow and cylindrical, and approaches 

 very near to Persicnla in form. 



Marginella prunum Gmelin, 

 Valuta prunum Gmel., Syst. Nat., p. 3446, 17S8 (e.x parte) ; Dillwyn, Descr. Cat., p. 530, 



1817. 

 Marginella cizrulescens Lam., An. s. Vert. vii. p. 356, 1822. 

 Marginella prunum Reeve, Conch. Icon., Marg., pi. xi. fig. 45, a b, 1865. Redfield, Cat. 



Marg., p. 251, No. 153. 



