INSTITUTE OF SCIENCE, PHILADELPHIA. 307 



Siliquaria vitis Conrad. 

 Siliquaria vitis Conr., Fos. Tert. Form., part 3, ist ed , p. 36 ; Aug., 1833, 2d ed., p. 47, pi. 



17, f- 3, 1S35. 

 Siliquaria claibornensis Lea, Contr. Geology, p. 33, pi. i, fig. i, Dec, 1833 ; Gregorio, p. 



121, pi. X. f. 42. 

 Tenagoda vitis Conr., Am. Journ. Conch, i, p. 33, 1865. 



Eocene of the Claiborne Sands, Conrad and Lea ; older Miocene of the 

 Orthaulax bed. Ballast Point, Tampa Bay, Florida, Dall. 



I can see no distinguishing characters between the specimens from the 

 Upper Eocene and those of the Lower Miocene. 



De Gregorio has figured a number of varieties of this species (pi. x. figs. 

 41, 44, 45 ; xi. figs. I, 2), and proposes for the smooth ones the varietal name 

 of plita. 



Other species of this group seem to be rare in the American Tertiary. 

 The only one I "have encountered is Siliquaria scitlptitrata Gabb (Journ. Acad. 

 Nat. Sci. Phila., 2d Ser. viii. p. 364, pi. 46, fig. 59 a, 1874), which is synony- 

 mous with 5. sqtiamata Blainville, a recent species abundant in the Antilles at 

 the present day. Gabb's fossil came from the Pliocene clays of Costa Rica. 



It may be as well to note here that Gabb and others have frequently used 

 the name Siliquaria in the sense in which it was used by Schumacher, to de- 

 nominate a Pelecypod shell related to Soletellina or Solen. 



Laxispira lumbricalis Gabb, from the New Jersey Cretaceous marl, from a 

 careful examination of the type-specimens, appears to be simply an internal 

 cast or mold of a species of Siliquaria. Such casts give no specific charac- 

 ters and simply indicate the presence of the genus. Having misinterpreted 

 Gabb's very poor figure and applied the name Laxispira to a remarkable 

 loosely coiled Trochid described by Prof Verrill (U. S. Nat. Mus. Bull. 37, p. 

 166), it is necessary to replace Gabb's name, now obviously a complete 

 .synonym of Siliqtiaria, by another which shall be applicable to the Trochid, 

 in question. I therefore propose for DelpJiinula nitida Ver. the name of 

 Eccliseogyra, as a subgenus of Liotia. 



Family TURRITELLID^. 

 Genus TURRITELLA Lamarck. 

 This genus is very abundantly represented in our Tertiaries, having made 

 a good beginning in the Cretaceous. More than eighty species have been 

 named and discriminated in the American Tertiaries. Of these, a certain pro- 

 portion are synonyms, but a large number seem to be valid forms. I had 

 intended to review the whole group in this place, but the difficulty of obtain- 

 ing a sufficient number of specimens of this very variable genus to do the 

 work properly, and the necessity of finishing this paper in a reasonable time, 

 have obliged me to reconsider this determination. I shall, therefore, confine 

 my attention to the Floridian species and their nearly allied congeners. 



