44 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



rounded whorls which extend from the anal fasciole to the canal 

 with wider interspaces which are axially striated by rather con- 

 spicuous incremental lines; spiral sculpture, comprising the sutural 

 cord; a deep constriction, spirally striated, which forms the anal 

 fasciole; and, in front of the fasciole about a dozen strong, sub- 

 equal, distant, and nearly equally spaced rounded threads which 

 are distributed over the whole whorl in front of the constriction; 

 these threads are but slightly swollen where they override the ribs, 

 between the sutures only two to four threads are visible; aperture 

 sublunate; anal sulcus shallow; outer lip defective, probably pro- 

 duced with a swollen varix behind it ; body and pillar callous ; canal 

 moderately wide, straight, short. Length of (decollate) shell 12.5, 

 of last whorl 7, maximum diameter 4 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. 



Type-specimen from the Post collection, U. S. Nat. Mus. No. 

 165037. 



DRILLIA EUPATORIA, new species. 



Plate 12, fig. 16. 



Shell small, slender, acute, sharply sculptured, of about 7 whorls ; 

 suture distinct, not deep; anal fasciole marked by a constriction 

 slightly in front of the suture, thus cutting off the posterior ends 

 of the ribs and marginating the suture; axial sculpture of (on the 

 penultimate whorl about 20) rather sharp narrow ribs, slightly 

 retractively flexed where they cross the furrow of the anal fasciole, 

 with wider interspaces, extending from suture to suture on the spire, 

 and over the whorl to the canal on the last whorl; spiral sculpture 

 of very fine equal parallel threads with about equal interspaces, on 

 the spire and shoulder, and (about 7) more widely spaced on the 

 base, and four or five more close set on the canal ; these threads over- 

 ride the ribs but do not nodulate them; aperture sublunate; outer 

 lip (in the specimen) thin, sharp, simple; pillar smooth, short; 

 canal short and wide. Height of shell 7, of last whorl 5, maximum 

 diameter 2.8 mm. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida. One 

 specimen from the Post collection, U. S. Nat. Mus. No. 165040. 



This species has much the sculpture of No. 165039, U. S. Nat. 

 Mus., but is a much smaller and relatively more sharply sculptured 

 shell. It is possible that the adult may have a varicose outer lip, and 

 that the type-specimen is immature, in which case the species would 

 be referable to the group to which Drillia ostrearum Stearns belongs. 

 The first or nuclear whorl is smooth and somewhat inflated. The 

 second shows the ribbing but not the spiral threads. 



