32 FOSSILS FROM SOVTHERN UNITED STATES— BALL. vol.xviii. 



without perceptible keel or plait, aud witli only the merest trace of a 

 groove behind it; outer lip straiglit. Longitude, 3.2; maximum diame- 

 ter, 1 mm, 



HahitaL—^aixwiil Well, I^uplin County, North Carolina (2279). 



Type. -No. 113887, U. S. N. M. 



This species only fails of being a Volvula by having a subcylindrical 

 perforation in the place of a projecting point. I have not seen any- 

 thing like it in the recent fauna. 



Genus BULLINA, Ferussae. 

 DnlJinula, Beck; type, 7)«/?Mm scahra, Gmelin+ ?"'ffl*«, Gray. 

 Section ABDEROSPIRA, Ball. 



hi the typical BulUna the spire is exposed or even elevated; in the 

 fossil about to be described the ai)ex of the spire is hidden, as in 

 Bulla, and marked only by a perforation. This difference seems worthy 

 of sectional discrimination. Type B. (A.) chipolana, Dall. 



BULLINA (ABDEROSPIRA) CHIPOLANA, new species. 



Shell small, ovate, strongly sculptured, umbilicated, with a i;)erfo 

 rate apex and hidden sjnre; surface sculptured with numerous sharp 

 spiral grooves with wider polished interspaces, crossed by distinct, 

 equally spaced incremental lines, more feeble on the interspaces, but 

 reticulating or punctuating the grooves; aperture as long as the shell; 

 outer lip axially nearly straight, incrementally slightly arched, thin, 

 with a simple edge and smooth internal surface; posterior sinus with 

 a moderate notch, anterior end rounded; i)illar thin, emarginate, with a 

 deep groove behind it, outside of which is a well-marked ridge bound- 

 ing a narrow, but deep umbilicus ; body with a thin wash of callus ; ai>ex 

 perforate, much as in Bulla striata. Longitude, 4.5; maximum diam- 

 eter, 3 mm. 



Habitat. — Chipola beds (2213), Chipola River, Florida, collected by 

 Burns; and near (latun. Isthmus of Uarien, by Eowell. 



Types.— l!io. 113894, IT. S. N. M.; and in Mr. Aldrich's collection. 



HAMINEA POMPHOLYX, new species. 



Shell small, thin, subglobular; widest behind the middle; surface 

 marked with fine incremental lines and sjnral strife, hardly visible 

 except under a glass; apex imin-essed, aperture wide, outer lip thin, 

 arched axially and incrementally, receding in front and imperceptibly 

 merging with the oblique, slightly thickened, twisted jnllar, which from 

 below is pervious; body with a thin wash of callus; shell slightly nar- 

 rowed in its anterior third. Longitude, 0.5 ; maximum diameter, 5.5 mm. 



i^a&ito/.— Chipola beds (2211, 2213), Florida. 



Types.— ^os. 113895-113897, U. S. N. M. ; and in the Aldrich collection. 



This species is shorter and more globose than any of the recent forms 

 of the coast. 



i 



