1917.] NATURAL SCIENCES OF PHILADELPHIA. 153 



cords, unequally spaced, with some small spiral stride in the widest 

 space. The last whorl is largely broken away. The columella 

 shows one very low, rounded plait. 



Length 24, diam. 5 mm.; 11^ whorls remaining. 



Type No. 2905, A. N. S. P. 



Drillia sororcula " sp. 



A shell with much the appearance of D. ischnatrada, but differing 

 by the much shorter aperture, less produced anterior canal, and the 

 absense of spiral striae in the intervals of the spiral cords. The 

 latter are quite low and rounded, equal to their intervals. On the 

 last whorl there are 13 between the anal and siphonal fascioles, on 

 the whorls of the spire 5, with another following the suture. The 

 anal fasciole is excavated, without distinct spiral striation. 



Length 40.5, diam. 12 mm.; length of aperture 19 mm. 9 whorls 

 remaining, the apical ones broken off. 



Type No. 2929, A. N. S. P. 



Drillia subgibbosa n. sp. 



Turris {Drillia) gibbosa Chemn., Gabb, Tr. Am. Philos. Soc, XV, p. 208, 

 Not of Born. 



The penult whorl is crossed by about thirteen rather sharp axial 

 ribs which weaken abruptly where they cross the concave anal 

 fasciole. Some short ribs are intercalated on the last whorl. The 

 back is humped by a broad, prominent varix. The anal fasciole is 

 without spiral sculpture ; below it there are six spiral grooves between 

 the ribs on the whorls of the spire, and on the last whorl about 

 fourteen, here passing over both valleys and ribs. The anal sinus 

 is deep, separated from the preceding whorl by a heavy callous pad. 

 Siphonal fasciole is prominent. 



Length 53.3, diam. 19 mm.; about 10 whorls. 



Though resembling the recent D. gibbosa, this form is at once 

 distinguishable by the less regular axial ribs, which do not end 

 abruptly at the shoulder, but continue weakly to the suture; also 

 by the less contracted anterior canal. 



Type and a smaller specimen are No. 2920, A. N. S. P. 



Drillia elocala n. sp. 



Drillia henekeni Sow., Cossmann, Jour, de Conchj^l., LXI, 1913, p. 25, PI. 3, 

 figs. 10, 11. Not of Sowerby. 



This shell resembles D. fusiformis Gabb in sculpture, but differs 

 by the far shorter anterior canal. The whorls are strongly convex, 

 with sculpture of large, rounded, slightly protractive ribs, 6 on the 

 penult, 7 on the last whorl. These ribs distinctly undulate the anal 



