INSTITUTE OF SCIENCE, PHILADELPHIA. 259 



rounder, more shouldered whorls. If this is not a piece of a much larger 

 specimen of T. chipolaiia, it indicates a different species. 



Turbonilla pusilla C. B. Adams. 



CheinnUzia pusilla C. B. Adams, Contr. Conch., p. 74, 1850. 

 Turbonilla pusilla Dall, U. S. Nat. Mus. Bull. No. 37, p. 128, 1889. 



Older Miocene of the Chipola beds, N. W. Florida, Burns ; living from 

 Cape Hatteras to Barbados in i6 to 300 fathoms. 



This species resembles C. levis, but is smaller. There are no spiral lines 

 between the ribs. The living and Chipola specimens were practically identi- 

 cal in all essential characters. 



Turbonilla interrupta Totten . 



Turritella interrupta Totten, Am. Jour. Sci., ist Ser., .x.xviii. p. 352, fig. 7, 1835. 



Melania rufa Philippi, Moll. Sicil. i. p. 156, pi. ix. fig. 7, 1836. 



Odosiomia rufa Pliil. \3,x . fuho-cincta ]t^x&^%, P. Z. S. 1884, p. 356. 



Turbonilla Riisei Morch ? 



Turbonilla viridaria Dall, Proc. U. S. Nat. Mus. vi. p. 332, 18S3. 



Turbonilla interrupta Holmes, Post- PI. Foss. S. Car., p. 83, pi. xiii. figs. 4, 4 a, 4 b, 1859. 



Dall, Rep. Blake Gastr. , pi. xxvi. figs. 2, 2 b. 

 Turbonilla quinquestriata Holmes, op. cit., p. 85, pi. xiii. figs. 5, 5 a, 5 b, 1859. 

 Turbonilla /2;/frt/rt Holmes, op. cit., p. 85, pi. xiii. figs. 7, a-b. 

 Turbonilla subulata Holmes, op. cit., p. 85, pi. xiii. figs. 8, a-b. 

 Turbonilla acicula Holmes, op. cit., p. 86, pi. xiii. figs. 10, a-b. 



Newer Miocene of the Cape Fear River, North Carolina, at the marl- 

 beds of Mrs. Guion and Mrs. Purdy, Johnson ; Pliocene of the Croatan beds, 

 North Carolina ; of the Waccamaw beds. South Carolina ; of the Caloosa- 

 hatchie. Shell Creek and Myakka River, Florida, Dall and Willcox ; Post- 

 Pliocene of South Carolina, Holmes, and of North Creek, Little Sarasota 

 Bay, on the Gulf coast of Florida ; living from Nova Scotia (Whiteaves, 

 Hinkley) or the Gulf of Maine (U, S. Nat. Mus.) southward to the Antilles 

 as far as Barbados and west on the north shore of the Gulf of Mexico to 

 Galveston, Texas. 



This fine and widespread species has also a wide range in time, but I 

 have great confidence that no error has occurred in the identification of the 

 Miocene specimens. 



The character of the sculpture and the nature of its variations are worth 

 a few words of explanation. The shell when fully adult and normally well 

 developed has about twenty small, straight, smooth ribs extending with a 

 slight obliquity from suture to suture. The interspaces vary from narrower 

 to wider than the ribs and are spirally sculptured with fine spiral striae. 

 These stri^ are the most variable feature in the shell. Sometimes they are 

 almost evanescent, so that, except in certain lights, the shell seems devoid of 

 spiral sculpture in the interspaces. More commonly the spirals are repre- 

 sented by fine scratches or incised lines, separated by wider interspaces, and 



