INSTITUTE OF SCIENCE, PHILADELPHIA. j 



Partnla ; which, among recent species, is exaggerated to oddity in the recent 

 B. angiostomns Wagner, of South America, the type of Albers' section Anctiis- 

 All have the aperture somewhat laterally compressed or pinched, and the lip 

 broadly reflected. 



The outer lip is usually a little thicker in the middle than near the body, 

 there is a little callus on the body uniting the lips, the pillar is simple and with 

 no indications of a fold or swelling. The umbilicus is represented by a chink 

 not a perforation, behind the inner lip and the aperture is less than half the 

 whole length of the shell. At the commissure between the outer lip and the 

 body a small mass of callus is deposited by the perfectly adult animal which is 

 marked bj' a straight or somewhat flexuous- sharp groove, which occupies the 

 middle of the callus. All the fossils and several of the South American forms 

 among the recent species possess this grooved callus and have the spire rather 

 sharply tapered, though the vertex is not very acute. 



The largest of the Floridian species was referred to Partula by Prof. Heil- 

 prin, and it has much the form of some PartulcB, but it seems to me the obvi- 

 ous relations of the group with those of the Antilles and South America render 

 it highly improbable that its nearest relations are to be sought so much farther 

 away. Moreover, the genus Partula is likely to be a very modern development 

 not to be expected in the Miocene, and especially in the American Miocene, any 

 more than Achatinella. I suspect that Pupa (or Bulimulus) fallax Say may 

 be a degenerate descendant of our Miocene group, as its form is much the 

 same and the only obvious difference in the shell is one of size. A small shell 

 somewhat resembling our land shells but without the reflected lip and generally 

 more like the group Thanmastus, to which he referred it, was described by 

 Meek and Hayden from the Fort Union Lignite group of Dakota, under the 

 name of Tliauviastus limneiformis. The type, however, looks more like an 

 Amaura than a land shell. I do not find anything figured from the European 

 strata of analogous age which can be closely affiliated to our shells. 



Bulimulus (? Anctus) floridanus Conrad (sp.). 



Plate I, figure ii. 



Bulimus flo7-idanus Conrad, Silliman's Journal, second series, vol. ii. p. 399, figure i 



Nov. 1S46. Am Journ. Conch., i. p. 144, pi. xi. fig. ri, 1865 (bad figure). 

 Not Bulimulus floridanus Pfr., 1856 (recent). 

 Eulima florid Mia Orbigny, fide Conrad, op. cit., 1865 (Ubi ?). 



Shell fusiform, anteriorly and posteriorly tapering, rather slender; tip 

 small, bluntly pointed, whorls moderately rounded, six in all ; the maxi- 

 mum length of the aperture equals less than half the total length ; aper- 

 ture with a reflected margin, broader anteriorly and on the pillar ; the 

 original type which we have figured is not entirely adult and the reflection 

 is wider in a perfectly mature individual. The inner and outer lip are con- 

 nected by a perceptible callus which is grooved slightly in the angle between 

 the outer lip and the body whorl. The aperture is slightly laterally compressed ; 

 there is a narrow chink behind the reflected pillar-lip. The outer surface of 



