INSTITUTE OF SCIENCE, PHILADELPHIA. 223 



This species is notable for its sharp-cut sculpture and minute nucleus, 

 giving a very pointed aspect to the spire and separating it at once from sev- 

 eral adjacent forms which show on the later portions of the shell a closely 

 similar sculpture. 



Drillia sigela n. s. 

 Plate 14, figure 2 a. 



Shell Creek Pliocene, Willcox. 



Shell much resembling D. hoplophoms, from which it is best separated 

 by a differential diagnosis. The present species has a more slender shell, 

 with the same number of whorls ; the last whorl is proportionally shorter; 

 the fasciole is smooth instead of spirally striate, and the margin behind it 

 wants the double threads of lioplopJioms, being rudely appressed and thick- 

 ened without spiral sculpture. The pillar in D. sigela has a strong siphonal 

 fasciole; the nucleus does not differ markedly. Lon. of shell 16.0 ; of last 

 whorl 8.0; of aperture 5.3; max. lat. of shell 5.3 mm. 



Though closely related, I have been unable to reconcile this shell specific- 

 ally with any of the varieties of hoplophoms which I have examined. 



Genus GLYPHOSTOMA Gabb. 



It is probable that Clathiwella, Carpenter, should be adopted in place of 

 Glypho stoma, but many incongruous forms have been referred to Claihnrella, 

 and I have not been able to study Carpenter's type-species. For these rea- 

 sons I do not make any change in the nomenclature here. 



Glyphostoma Johnsoni n. s. 

 Plate 14, figure 6. 



Cape Fear River Miocene beds, Johnson. 



Shell with five later sculptured and probably two smooth nuclear whorls, 

 one broken in the specimen; spiral sculpture in the later whorls strong, con- 

 sisting of five rounded primary threads between the anal fasciole and the 

 suture in front of it, the two strongest at the periphery shouldering the 

 whorl; in front of the shoulder the primaries are alternated by secondaries 

 except on the canal ; there are about twenty primaries altogether, including 

 those on the canal ; behind the shoulder the anal fasciole is flattened and in- 

 clined to the suture like a roof; it is entirely covered with close-set, uniform 

 secondary threads, six or eight in number; transverse sculpture of about 

 fifteen short, mostly peripheral, riblets,the interspaces of which are prolonged 

 forward as deeply impressed lines on the last whorl ; aperture narrow, anal 

 notch wide and deep, outer lip heavily varicose, denticulate at the edge and 

 Urate, with prominent short denticles within ; canal deep, short, recurved ; 

 inner lip callous, with five or more prominent denticles upon the enamel. 

 Lon. of shell 10; of last whorl 7; of aperture 5 ; max. lat. of shell 5 mm. 



