NEW FOSSIL FRESH-WATER MOLLUSKS FROM 



FLORIDA 



By William B. Marshall, 



Assistant Curator, Division of Molluslcs, United States National Museum 



Manly D. Barber, of Ivnoxville, Tennessee, while visiting West 

 Palm Beach, Florida, recently sent to the United States National 

 Museum a lot of fossil shells for identification. They were labeled 

 "Fossils from marls, thrown from canals. West Palm Beach, Flor- 

 ida." The lot includes two species of Lymnaea, a species of very 

 large Planorhis^ and an unusually thick species of Pliysa. It was 

 found that all four of the species were new. Three of them are de- 

 scribed below. The Physa ^ has been described by William J. Clench, 

 of the University of Michigan. All data obtainable indicate that 

 they belong to the Pliocene. The PIanQ7'Ms is very closely related 

 to P. co7ianti Dall, of the Caloosahatchie Beds of the Pliocene of 

 central Florida. A test with acid shows the marl to be highly 

 calcareous. 



LYMNAEA (PSEUDOSUCCINEA) BARBERI, new species 



Plate 1, fig. 5 



Shell fragile, imperforate slender, very elongate, whorls rapidly 

 descending, very slightly rounded, front aspect of body whorl ap- 

 pearing to be compressed; sutures very oblique, well impressed, 

 subcrenulate. Sculpture consisting of many fine, axial growth 

 lines and several indistinct impressed spiral lines; aperture one- 

 half the length of the shell, ovate, its upper angle bent down and 

 coming within two millimeters of the columella where it enters the 

 aperture; outer lip thin, parallel with the axis; basal lip widely 

 rounded, columellar lip very oblique. 



Tlie type. Cat. No. 853155, U.S.N.M., measures: height, 20 mm.; 

 diameter, 8 mm. ; length of aperture, 10 mm. Cat. No. 353156 in- 

 cludes eight paratypes. 



The species is named in honor of Manly D. Barber, who has long 

 been a liberal contributor to the Museum's collections. 



The only species to which this seems to bear any relation is 

 Lyinnaea {Pseudosuccinea) columella Say. 



1 Dec. Papers Mus. Zool. Univ. of Michigan, No. 164, pp. 1-3, pi. 1, Aug. 3, 1925. 



No. 2612. — Proceedings U. S. National Museum, Vol. 68. Art. II 



60727—26 



