276 TRANSACTIONS OF THE WAGNER FREE 



elements which make up its sculpture, as do all the species of this group. It 

 appears to be very common in the Chipola marl. 



Bittiutn (Styliferina) cerithidioides Dall. 



Plate 16, figure S. 



Billium {Alaba?) cerithidioides Dall, Blake, Gastr. Rep., p. 258, Mar., 1S89 ; U. S. Nat. 



Mus. Bull. 37, p. 140, 1S89. 

 Compare Chemnitzia dubia Orbigny, Moll. Cuba, i. 226, t. xvii. figs. 4, 6, 1842. 



Older Miocene of Bowden, Jamaica, W. I., Bland in Nat. Museum ; Plio- 

 cene of the Caloosahatchie, Florida, Dall, and Costa Rica, Gabb ; Post-Plio- 

 cene of Simmons's Bluff, South Carolina, Burns ; living from Cape Lookout, 

 North Carolina, to Samana Bay, Santo Domingo, U. S. Fish Corhmission. 



This elegant little shell passes unchanged from the older Miocene to the 

 present day. I have not been able to compare a specimen of Orbigny's 

 species, which is obviously one of the same group, but it appears to be more 

 slender and with fewer, less inflated whorls in the same length, if his figure is 

 to be trusted. He speaks of finding it not only in the Antilles, but also at 

 Rio Janeiro, and it may be that there has been a confusion between two 

 species, one Brazilian and one Antillean, and that a Brazilian specimen was 

 selected for figuring. Bittimn canaliculatiim Gabb, from the Pliocene of Costa 

 Rica, is very similar. 



Bittium (Styliferina) Adamsi Dall. 



Billium [Alabd) Adamsi Dall, Blake, Gastr. Rep., p. 258, Mar., 1889 ; Bull. U. S. Nat. Mus. 

 37, p. 140, 1889. 



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

 Willcox; living from Cape Hatteras, North Carolina, to Haiti, W. I., in 

 moderate depths of water. 



This species has the size and form of B. cerithidioides, with the sculpture 

 of B. boiplex. It is not unlike B. asperoides Gabb, from the Costa Rica Plio- 

 cene. Bittium Kceneni Meyer (Alabama Geol. Rep., p. 70, pi. 2, f 12, 1886) is an 

 analogous species from the Eocene of the Jackson group, in which the rib- 

 bing is more oblique and nodulous and the shell itself very much smaller. 

 It bears a suspicious resemblance to Melania claibornensis Heilprin, 1879. 

 Other species of Bittimn from the Tertiary of North America are CeritJmim 

 Collinsii Gabb and C. triseriale Gabb, from the Pliocene of Costa Rica. 

 Chemnitzia modesta Orb., referred by Gabb to Bittium, is a Turbonilla. 

 Cerithium curtiim H. C. Lea may be the tip of a small Bittium, but is hardly 

 recognizable. Bittium costatum Gabb, from the Pliocene of Costa Rica, may 

 be a valid species. 



Genus CERITHIUM Bruguiere. 

 Cerithium Brugui^re, Enc. Meth. 17S9, non Lamarck, 1799. 



The subdivisions into which this group have been divided are worthy of 



