INSTITUTE OF SCIENCE, PHILADELPHIA. 35 



notch shallow, rounded ; a moderate callus on the body ; aperture short and 

 narrow, with no differentiated canal. Max. Ion. of shell 9.3 ; max. lat. 3.5 mm. 

 The principal characteristic of this species is the strong presutural thread. 

 In the specimens collected the terminal varix was not quite completed, but 

 when this occurs the outer lip is probably stouter than shown by the figure. 



DriUia edilia n. s. 

 Plate 3, figure 9. 



Caloosahatchie beds, one specimen. 



Shell very small, short, with five or six slightly shouldered whorls ; nucleus 

 of the same general character as in D. sedilia, but transversely ribbed all over 

 and more elevated ; later whorls with rather faint, close-set, flattened spirals, 

 which override the transverse sculpture but are very faint upon it ; the inter- 

 spaces appear like grooves and are more conspicuous than the spirals; the 

 transverse sculpture of numerous (on the last whorl eighteen) narrow, rather 

 feeble riblets, strongest near the fasciole, which is smooth, excavated and a 

 little scalar ; terminal varix swollen, notch wide and deep; aperture narrow, 

 not differentiated from the short canal. Max. Ion. of shell 4.0 ; max. lat. 1.6 mm. 



Notwithstanding the small size and large nucleus of this little shell, it has 

 evidently begun its varix, though the callus on the body is not yet complete. 

 I cannot so far find any other to unite it with. 



Drillia bigemma n. s. 

 Plate 2, figure 6. 



Caloosahatchie beds, rare. 



Shell small, stout,fusiform, six-whorled ; nucleus rather large, at first smooth, 

 then spirally grooved ; succeeding whorls rather coarsely sculptured ; spiral 

 sculpture of rather sharp grooves, with wide interspaces, cutting the transverse 

 sculpture ; on the earlier whorls there is a stout cord next the suture, in front 

 of which the fasciole is somewhat depressed, with three or four fine spirals on 

 it ; on the periphery is .a deep groove, and next the succeeding suture the 

 whorl is again depressed ; on the base of the last whorl in front of the periphery 

 are about six interspaces between grooves, of which the first, third and fourth 

 are depressed below the others ; all the others have their posterior edges higher 

 than the anterior edges ; beside these there are four or five flatfish spirals on the 

 canal ; the transverse sculpture is exhibited chiefly in the form of nodes on the 

 spirals. On the periphery, divided by a sharp groove, is a paired series of large, 

 axially oblong nodes ; on the basal spirals the nodes are small, squarish and 

 twice as numerous in the same spiral distance ; the presutural cord has a series 

 of round nodules which sometimes are obsolete, but when present follow the 

 peripheral nodes ; terminal varix not prominent ; notch wide and deep ; callus 

 moderate ; outer lip arcuate in the middle ; canal wide, short, straight. Max. 

 Ion. of shell S.O ; max. lat. 3.0 mm. 



