374 TRANSACTIONS OF THE WAGNER FREE 



and feeble callus. The young resemble L. interna, but want the umbilical rib, 

 though it is sometimes quite difficult to separate immature specimens. 



Other species of Lwiatia known from our Tertiary on the Pacific Coast 

 are L. nuciformis Gabb, from the Eocene ; L. alveata Conrad, which, however, 

 may be an Amatiropsis ; L. oregonensis Conrad, from the Astoria Miocene, and 

 L. Leivisii Gould, the largest species of the group, which extends from the 

 recent to the Pliocene fauna. L. gronlandica Beck, an Arctic species, is found 

 in the northern Post-Pliocene on both sides of the continent. 



Genus 9AMPULLINA (Lamarck) Bowdich. 

 Section Amputlina s. s. 

 Ampullina streptostoma Heilrrin. 

 Naiica streptostoma Heilp., Trans. Wagn. Inst. i. p. 112, pi. 16, fig. 51, 1887. 



Jacksonian Eocene of the white limestone at Claiborne, Alabama, Whit- 

 field ; Old Miocene of the Orthaulax bed at La Penotiere's Hammock and 

 Ballast Point, Tarnpa Bay, Florida. 



This form is closely related to Ampullina sigaretina, from which it appears 

 to differ by its wider basal callus and more open umbilicus. I have not had 

 sufficiently good or sufficiently abundant material from Ballast Point to enable 

 me to discuss the species with confidence. 



Ampullina Fischer! n. s. 

 Plate 22, figure 36. 



Old Miocene of the Chipola beds, near Bailey's Ferry, Chipola River, 

 Calhoun Co., Florida. 



Shell closely related to Auipullina sigaretina of the Parisian Eocene, from 

 which it differs by its somewhat more depressed spire, less impressed suture, 

 wider basal fasciole, and by the thick, complete coat of callus, which in the 

 adult covers completely the fasciole and umbilicus, as in Cernijia fluctiiosa. 

 The shell is also slightly less expanded and rounded than the European fossil. 

 It has a low but pointed spire, six or seven whorls, smooth surface with im- 

 pressed incremental lines, slightly flattened callus, and in front of the suture 

 the whorl is flattish instead of rounded, as in A. sigaretina. A shell of six 

 whorls measures 33 mm. high and 38 mm. in maximum diameter, but I have 

 fragments which measure over 60 mm. in diameter. 



This form was at first regarded by me as being merely a mutation of A. 

 streptostoma, but of more than twenty-five specimens from various localities 

 which were in a state to show the base, not a single one has an open umbilicus, 

 while all the Ballast Point and Claibornian specimens have the umbilicus open. 

 The young of both are not separable. It may eventually prove to be a local 

 race of A. streptostoma, but at present would seem better kept apart. 



It is respectfully dedicated to Dr. Paul Fischer, of Paris, the distinguished 

 paleontologist and malacologist. 



