280 



DESCRIPTION OF A COLLECTION OF FOSSILS, 



concave interspaces, and consequently no room for the finer linear markings 

 described above. 



T. Peruana, n. s., PL 40, fig. 3. 



Shell moderate in size, long, slender, many whorled ; whorls flattened on the 

 sides, or very slightly concave, sloping outwards below; top flattened, narrow and 

 sloping ; surface marked by three large revolving ribs, one on the upper angle, 

 one in the middle, and the last near the base; basal margin angular; base slightly 

 convex; outer lip deeply and roundly emarginate above, produced towards the base. 



Measurements. Length of three whorls, 0.75 in.; width of body whorl, 0.25 in. 



Locality. From the hacienda of Macanga, Prov. of Pataz. Cretaceous. Asso- 

 ciated with the Perissolax trochoides and Niethea quinquecostata. 



TYLOSTOMA, Sharpe, 1849. 

 Varigera, d'Orb., 1850.* 



T. MTJTABiLis, Gabb, PI. 40, fig. 4, 4a. 



T. mutabilis, Gabb, Palaeontology of California, p.-261, PI. 35, f. 6. 



Shell subglobose, spire high,^ whorls six or seven ; body whorl most convex 



above the middle; varices obhque, large; aperture elongate-ovate. Surface 



unknown. 



From near the ruins of Cuelapo, twelve leagues from Chachapoyas and "haci- 

 enda of Uchupata, Province of Huari, height of 2000 metres." Cretaceous. 



Remarks. Described from casts retaining almost none of the shell. Found 

 associated with Echinus BoUvari, d'Orb. The specimens are all more or less dis- 

 torted, but I cannot find, in the absence of surface characters, any on which to 

 separate this from the shell described by me under the above name from Mexico. 



GINULIA, Gray. 

 C. ANTIQUA, n. s., PI. 40, fig. 5, 5a. 



Shell ovate, convex ; spire high ; whorls broadly and regularly convex, outline 

 of one side of the body whorl nearly a perfect segment of a circle; suture im- 

 pressed ; surface marked by about twenty regular equal rounded ribs with smaller 

 interspaces. Aperture elongate, narrowed behind; outer lip very much thickened 

 by a strong marginal rim ; details of inner lip unknown. 



Measurements. Length, 0.43 in.; greatest width, 0.25; length of aperture, 

 0.32 in. 



* Although cl'OrbJgny claims the date of 1847 for this genus it cannot be allowed, since it was only indi- 

 cated by name without a recognizable description in the Prodrome, and his first full description was published 

 in 1850 ; Avhile Sharpe had already characterized the genus a year previously. 



