FAUNA OF ORTHAULAX PUGJSTAX ZONE. 47 



number of finer close-set threads; aperture sublunate, anal sulcus 

 shallow, the outer lip thin, simple, not lirate internally; body and 

 pillar smooth, not callous; canal short, wide, straight. Length 8, 

 maximum diameter 3 mm. 



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



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

 165338. 



MANGILIA, sp. indet. 



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

 Nat. Mus. No. 165041. 



A single specimen different from the preceding species seemed too 

 badly preserved for identification. 



Family CANCELLARIIDAE. 



Genus CANCELLARIA Lamarck. 



Cancellaria Lamarck, Prodrome, 1799, p. 71. Sole example, Valuta reticu- 

 lata Linnaeus. 



Subgenus TRIGONOSTOMA Blainville. 



Trigonostoma Blainville, Man. de Mai., vol. 2, 1827, p. 652. Type, Murex 

 scala Gmelin, Syst. Nat., pt. 6, p. 3551, No. 95, 1792. i=Delphinula 

 trigonostoma Lamarck, An. s. Vert., vol. 6, p. 231, note 1822). 



Trigona Perry, Couch., 1811, pi. 51, fig. 1 ; not of Jurine, 1807. 



Trigonostoma, Jousseaume, Le Naturaliste, Paris, vol. 9, 1887, pp. 157, 213; 

 reprint 1888, p. 22. 



CANCELLARIA SUBTHOMASIAE Dall. 



Plate 3, fig. 7; plate 10, fig. 1. 



Cancellaria subthomasiae Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 44, 



pi. 2, fig. 3, 1890. 



Shell of moderate size, strongly sculptured, turrited, of about 7 

 whorls; nucleus minute, smooth, of about one whorl; subsequent 

 whorls axially sculptured with (on the penultimate whorl 11, on the 

 last whorl nine) strong, crenulated, elevated ribs, angular, or even 

 subspinose at the shoulder behind which the whorl is subtabulate; 

 these ribs are moderately retractive, feeble at the suture, most ele- 

 vated at the shoulder, and continue over the whorl to the siphonal 

 fasciole, somewhat recurved, and concave behind and axially striated 

 in front ; spiral sculpture of numerous fine threads, with a tendency 

 to alternate in strength, subequidistant, the interspaces equal to the 

 threads or wider; the threads override and somewhat crenulate the 

 edges of the ribs; base with a strong siphonal fasciole and small 

 umbilical perforation ; aperture subtriangular, with continuous mar- 



