2gO TRANSACTIONS OF THE WAGNER FREE 



Genus OERITHIDEA Swainson. 

 Cerithidea turrita Stearns. 

 Cerilhidea turrila Stearns, Proc. Bost. Soc. N. Hist. xv. p. 24, 1S72. 



. Pliocene of Shell Creek, Florida, Willcox ; living on the west coast of 

 Florida and the Bahamas. 



It is somewhat singular that this little species should be the only one of 

 the group yet found in the Floridian Pliocene. It is probable that the place 

 now occupied in the economy of Nature by Cerithidea on the shores of 

 Florida was in those older days filled by the now extinct Pyrazisinus. 



The type-specimen of Cerithidea viinnta Gabb, from the Miocene of Santo 

 Domingo (Geol. Rep. St. Domingo, p. 239, 1873), is a species of Rissoina. 



Genus CLAVA Martyn. 



=^ Ctava Martyn, Univ. Conch., Table, 1789; ■\-Ceyithmm Lamarck, 1799; ^Vertagus 



Schumacher, 1817 ; -\r Rhinoclavis Swainson, 1840. 

 =^ Cerithium Bruguiere, Enc. M^th. 1789, ex parte. 



By adopting Martyn's name (the first of his two species being a Vertagits) 

 we can retain Cerithium Bruguiere for the mass of the Cerites without violat- 

 ing the rules of nomenclature. 



Clava plebeia Sowerby. 



Cerithium plebeium Sby., Quart. Journ. Geol. Soc. vi, p. 51, 1850; Guppy, Proc. Geol. 

 Soc. Lond. xxii., pt. i. p. 290, pi. xvi. tig. 9, 1866. 



Miocene of Santo Domingo and Jamaica, Heniker and Guppy. 



This fine species is of the type found in the Southern Tertiary of the 

 United States, but is larger and has a proportionately larger last whorl than 

 any of our species. 



Olava chipolana n. s. 

 Plate 22, figure 8. 



Older Miocene of the Chipola beds. Northwest Florida, Burns. 



Shell small for the genus, with two extremely minute, smooth nuclear 

 whorls and thirteen to fifteen subsequent sculptured whorls ; the tip of the 

 spire is very acute, from about the seventh whorl it is enlarged more rapidly in 

 proportion ; the early whorls have about seven sharply elevated narrow ribs, 

 extending across the whorls, with wider interspaces, over which run three 

 strap-like spirals with about equal channelled interspaces, prominent but not 

 nodulous at the. intersections ; the ribs gradually get more numerous and 

 close-set, so that the reticulations are about square, and between the spirals a 

 small intercalary thread appears which becomes wavy on the last whorl ; the 

 varix occurs at the end of the first third of the last whorl, and beyond it the 

 ribs are obsolete; the last whorl. has six prominent and as many intercalary 

 spirals behind the base, which has three or four somewhat smaller rippled 



