1896.] NATURAL SCIENCES OF PHILADELPHIA. 329 



with coarser riblets becoming regular, curved, moderately coarse 

 ribs on the cylindrical portion, on base of last whorl obsolete or sub- 

 obsolete. Latter 3 to 4 whorls of about equal diameter, those above 

 forming rather a long cone. Aperture rounded, truncate above, 

 white within. Peristome white, narrowly expanded and reflexed, 

 obtuse ; parietal callus very thin or moderate. Axial fold incon- 

 spicuous from in front ; parietal tooth extremely small, short. 



Alt. 21 i, diam. 10 J ; alt. of aperture 8? mm. 



Alt. 195, diam. 9? ; alt. of aperture 8 mm. 



Alt. 18?, diam. 10 ; alt. of aperture 7 mm. 



Cuba. 



While this species is very much smaller than C. incrassatum, and 

 has the parietal tooth extremely small or almost obsolete, still in 

 figure and sculpture it resembles the larger shell, and may be con- 

 sidered a variety of it until further information is received. 



C. incrassatum, like the very closely allied C. dhnidiatum, has a 

 smooth form which intergrades with the stoutly ribbed typical 

 shells. The earlier whorls have the minute sculpture as in the type 

 form, but to the unaided eye the surface appears smooth. 



Cerion iostomum Pfeiffer. PI. XI, fig. 14. 



This species has not been figured. It was described from the 

 south coast of Cuba living among Prickly Pears. Subsequently it 

 was reported from Turk's Island and Great Inagua (see Bland, 

 Ann. Lye. Nat. Hist., N. Y., XI, p. 85), but having examined spec- 

 imens from these localities, so labelled by Bland, we find them to be 

 totally distinct species, having little save the purplish-brown color 

 of the mouth, in common with the true Pvpa iostoma of Pfeiffer's 

 first description. 



The specimen shown in our figure answers to the description of 

 PfeiflTer in all respects save that the median whorls are only obsoletely 

 ribbed, hardly " distanter plicato-costata " — more like the " var. /5." 

 The post-nepionic whorls of the cone are " conferte costu latum ; " the 

 cone itself " corneo-marmoratum", suture conspicuously '^ exserto- 

 marg'mata," and the corrugation of last whorl and color of aperture 

 (" inius violacea ") are likewise in agreement. The specimen figured 

 is 2 mm. shorter than Pfeiffer's. Alt. 30, diam. 12 ; alt. of aperture 

 12 mm. 



Pfeiffer's type measured, alt. 32, diam. 12 ; alt. of aperture 13 mm. 



22 



