332 TRANSACTIONS OF THE WAGNER FREE 



which Cyclogyra iipa De Gregorio is perhaps a fragment of a very large 

 specimen, judging from the figure and description. Two recent species, D. 

 nobilis Verrill and D. lamellifera Dal), are Icnown from deep water off our 

 Southeastern coast. 



It may be noted liere that an examination of the type-specimen of 

 Planaria nitetis Lea, which has been referred to many genera and has often 

 been associated with his Orbis, left the impression on my mind that it was 

 allied to Oxygyrus or Atlanta and was a pelagic shell, but Aldrich with much 

 plausibility has regarded it as the larval shell of a Solarium. 



Section Discosolis Dall. 

 Discolielix retifera n. s. 

 Plate 19, figures i, i b, i c. 



Pliocene of the Caloosahatchie, Dall. 



Shell with a smooth sinistral, inverted nucleus and three subsequent sculpt- 

 ured whorls; upper surface flattened, with a prominent beaded cord on each 

 side of the slightly channelled suture, that one in front of the suture the more 

 prominent of the pair ; between them are three smaller simple spiral elevated 

 threads, the whole crossed by numerous oblique, elevated, radiating ridges with 

 equal or wider interspaces, which continue over the periphery and base to the 

 umbilical rib ; periphery formed by a third prominent cord, which is buried in 

 the suture, while another marginates the base, between which are four smaller 

 ones ; between the basal cord and the umbilical rib are two small spirals, the 

 whole reticulated by the transverse sculpture ; umbilical rib strong, coarsely 

 annulate or nodose; sides inclined toward the umbilicus; base somewhat ex- 

 cavated ; umbilicus large, scalar ; aperture quadrate, with a thin edge somewhat 

 reflecting the sculpture and grooved at the end of the umbilical rib. Max. 

 diam of shell 4.5 ; min. do. 3.0; alt. 1.3 mm. 



A single specimen of this elegant little shell was obtained from the marl. 

 Its upper surface recalls S. ammonites Lam., from the Paris basin, but the 

 details of its sculpture are quite different. 



Family VIVIPARID^. 



Genus VIVIPARA (Martini) Lamarck. 



Historical Synonymy. 



Cochlea vivipara fasciata Lister, Hist. An. ii. pi. 126, fig. 26, 1675 ; Ibid., Exerc. Anat. ii. 



pi. 2, fig. 17 ; Conch., t. 1055, f. 6. 

 Coch/ea s<p. Linn6, Faun. Suec, p. 375, 1746. 



Cochlea vivipara Swammerdam, Bibel der Nat., p. 78, pi. ix. figs. 3, 4, 1752. 

 La vivipare Geoffroy, Traite som. Coq. Paris, p. no, pi. 3, f. 2. 1767. 



Binomial Synonymy. 



Helix sp. {vivipara) Linn^, Syst. Nat., Ed. x. pp. 772, 774, 1758. 

 Vivipara {fasciata) Martini, in Geoffroy, ed. Germ., p. 97, 1767. 



