ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 9 



DESCRIPTIONS OF SPECIES 



Class GASTROPODA 



Genus CYLICHNELLA Gabb 



CYUCHNELLA OVUM-LACERTI (Guppy) 



Plate 1, figs. 7, 9 



Cylichna ovum-Iacerti Guppy, Sci. Assoc. Trinidad Proc, vol. 1, pt. 3, p. 168, 1867, 



(Described). 

 Cylichna ovum-Iacerti Guppy, Geol. Mag., vol. 1, p. 407, pi. 18, fig. 2^, 1874. 

 Tornatina (CyUchiieUa) ovum-Iacerti Guppy, Dall. U. S. Nat. Mus. Proc, vol. 



18, p. 27, 1896. 

 Not Cylichnella ovum-Iacerti (Guppy), Pilsbby, Acad. Nat. Sci. Phila. Proc, 



pt. 2, p. 311, text-fig. 7, 1921. 



"Shell small, cylindrical-subovate, minutely striate transversely; 

 spire small, sunken ; aperture as long as the shell, dilated anteriorly ; 

 outer lip straight, blunt; columella callus with a strong tortuous 

 fold." 



" Lower Miocene, Manzanilla." (Guppy, 1867). U. S. Nat. Mus. 

 Cat. No. 115435. 



The shell of this species possesses a more cylindrical outline, a 

 greater median compression than the form figured by Pilsbr}^,^ or 

 specimens in the United States National Museum collection from 

 the Dominican Republic. However, it is quite similar. 



Genus RINGICULA Deshayes 



RINGICULA, species indeterminable 



Ringicula. doubtful species, junior, Dall, U. S. Nat. Mus. Proc, vol. 19, p. 305, 

 1896. 



The following is an original description of this doubtful species: 



" Oblong-ovate, turrited ; whorls five, spirally ribbed by rounded 



costae with narrow (linear) interstices; aperture suboval; columella 



with two strongly twisted folds; spire conic; apex smooth, blunt. 



Length 3 mm., breadth 2 mm." [G.] 



"Ditrupa bed, Pointapier, Trinidad, Guppy (2270). No. 107108, 

 U.S.N.M. Shells all incomplete and too young to name or dis- 

 criminate, but useful as establishing the presence of this genus in 

 the beds" [Dall], 1896. 



RINGICULA, species aff. R. TRIDENTATA Guppy 



Shell is ovate, four whorled; whorls inflated, slightly depressed in 

 front of the grooved suture. Sculpture consists of spiral striae only 

 visible on the penultimate and body whorls; on the penultimate 



^Acad. Nat. Sci. Phila. Proc, pt. 2, p. 311. 

 9116—25 2 



