INSTITUTE OF SCIENCE, PHILADELPHIA. 25I 



The Norwegian recent specimens are absolutely indistinguishable from 

 the Shiloh fossil. The var. acutldens is the southern, especially Floridian, 

 form both recent and fossil, it is less elevated, slightly more angulate toward 

 the base, and has a proportionately more prominent and sharp- edged tooth or 

 plait on the pillar. There is a fine series of the typical conoideiis in the Jef- 

 freys collection with which the American specimens have been carefully com- 

 pared. 



Odontostomia impressa Say. 



Turritella impressa Say, Journ. Acad. Nat. Sci. ii. p. 244, 1822. 



Cheninitzia impressa Stimpson, Sh. of N. E., p. 42, 1851. 



OdosioDiia impressa Gould, Inv. Mass., Ed. Binney, p. 330, fig. 600, 1870. 



Pliocene of the Caloosahatchie beds and Shell Creek, Florida ; Post- 

 Pliocene of South Carolina ; living from Massachusetts Bay to St. Augustine, 

 and in the northern part of the Gulf of Mexico. 



This is one of those species which seem to have reached the shores of 

 the Gulf of Mexico in the early Pliocene, before the Georgian Strait was 

 closed, but which never doubled the southern end of the peninsula. 



Odontostomia seminuda Adams. 



Jaminia seminuda Adams, Bost. Journ. Nat. Hist. ii. p. 280, pi. 4, fig. 13, 1839. 



Odostomia seminuda Gould, Inv. Mass., p. 273, fig. 178, 1841 ; Dall, Bull. U. S. Nat. Mus. 



No. 37, p. 130, No. 6j8, pi. 52, fig. 10, 18S9. 

 O. var. granaiina Dall, Proc. U. S. Nat. Mus. vi. p. 331, 1883. 



Fossil in the newer Miocene at Mrs. Guion's and Mrs. Purdy's marl-pits 

 on the Cape Fear River, North Carolina; in the Pliocene of the Croatan beds 

 in North and the Waccamaw beds in South Carolina, the Caloosahatchie beds 

 and Shell Creek in Florida ; living from Prince Edward's Island (Hinkley) to 

 Florida and the Gulf of Mexico. 



This species has a somewhat similar distribution to the preceding, but 

 is known to have, penetrated as far south as Charlotte Harbor. It is the 0. 

 granulatus of Holmes (as of H. C. Lea), but probably not of Lea. 



Subgenus Syrnola A. Adams. 



Odontostomia (Syrnola) fusca C. B. Adams. 



Pyramis fusca Adams, Bost. Journ. Nat. Hist. ii. p. 282, pi. 4, fig. 9, 1839. 

 Jaminia fusca Adams, op. cit., iii. p. 337, 1S40. 

 Odostomia fusca Gould, Inv. Mass., p. 270, fig. 342,1841. 

 Chemnitzia fiscaS\\vi\'(>so'c\, Sh. of N. Engl., p. 41, 1852. 

 Syrnola fusca Dall, Bull. U. S. Nat. Mus. No. 37, p. 130, No. 62S, pi. 52, fig. 15, 1889. 



Fossil in the Pliocene of the Caloosahatchie beds and the Post-Pliocene 

 of North Creek, Little Sarasota Bay, Florida ; living from Cape Cod south- 

 ward to Florida, but extremely rare everywhere. 



