360 PROCEEDINGS OF THE ACADEMY OF [April, 



SOLARIID^3. 



Solarium granulatum gatunensis Toula. 



S. gatunense Toula, Jahrb., p. 692, PL 25, fig. 3. 



This form is more depressed than S. granulatum or its ancestor 

 S. quadriseriatum Sowb., but with sculpture closely resembling both, 

 and especially the form of granulatum found in the Bowden Oligocene. 

 It differs from all of the above-named forms by lacking a small thread 

 in the intervals immediately above and below the peripheral cord. 

 The Gatun shell is probably, therefore, a lateral branch from the 

 quadriseriatum granulatum stock. 



NATICID^J. 

 Natica guppyana Toula. 



Natica guppyana Toula, Jahrb., p. 696, PL 25, fig. 6. 



Closely related to N. rugosa Gmel., but adult shells are larger, with 

 the grooves obsolete in the middle of the last whorl. 

 Natica C?) sp. undet. PI. XXVII, figs. 6, 7. 



Internal cast of a species having about the size and contour of the 

 small southern race of P. duplicate (Say). Diameter 40 mm. 



Polinices subclausa (Sowb.). 



Natica subclausa Sowb., Journ. Geol. Soc. Lond., VI, p. 51 (Santo Domingo). 



*Lupia perovato Conrad. 



Dall in Hill, Bull. M. C. Z., XXVIII, p. 273. 



Vamos a Vamos beds (Hill). Cf. Amaura guppyi Gabb. 



Sigaretus gatunensis Toula. 



Sigaretus (Lupia Conrad) gatunensis Toula, Jahrb., p. 697, PL 28, fig. 3. 



A form related to S. perspectivus Say. 



CAPULID^J. 



*Capulus (?) gatunensis Toula. 



Jahrb., p. 692, PL 25, figs. 1, 2. 



Possibly identical with the Cheilea described below, but if so the 

 generic characters have been overlooked by Toula. It differs by the 

 oblong shape and more nearly central apex. 



CALYPTR^IDuEJ. 

 Crepidula plana Say. 



Several specimens occurred in the apertures of other gastropods. 



Cheilea princetonia n. sp. Fig. 2. 



A small species, circular, conic with apex curved in a minute hook ; 

 front slope somewhat convex, posterior slope nearly straight; surface 

 with sculpture of fine growth-lines and a few wide, low, irregular 



