FAUNA OF ORTHAULAX PUGNAX ZONE. 83 



whorls slightly convex; aperture sublunate; outer lip protractively 

 arcuate, passing insensibly into the columellar lip, which is thick- 

 ened, prominent, and with a slight depression behind it. Length of 

 5^ decollate whorls 7.5, of last whorl 4, maximum diameter 3 mm. 



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

 specimen from the Post collection, U. S. Nat. Mus. No. 165093. 



Family PYRAMIDELLIDAE. 

 Genus PYRAMIDELLA Lamarck. 



Pyramidella Lamarck, Prodrome, p. 76, 1799. Monotype, Trochus dola- 



bratus Linnaeus. 

 Obeliscus Anonymous, Mus. Calonnianum, p. 24, 1797. First species, Voluta 



dolabrata Solander, manuscript. 



Obeliscus is proposed in an anonymous work which is rejected as 

 an authority for nomenclature by the International Commission on 

 Nomenclature, there is no diagnosis or figure, and the two species 

 mentioned are manuscript names. We need not therefore concern 

 ourselves with the name Obeliscus in any event. 



Subgenus LONGCHAEUS Morch. 



Longchwus Morch, Malak. Blatt, vol. 20, 1875, p. 158. Type, Pyramidella 

 punctata Scliubert and Wagner.— Dall and Babtsch, Mon. W. Amer. 

 Pyr., Bull. U. S. Nat. Mus., No. 68, p. 21, 1909. 



PYRAMIDELLA (LONGCHAEUS) CRENULATA Holmes. 



Plate 13, fig. 4. 



Obeliscus crenulatus Holmes, Post. Plioc. fos. S. Car., p. 88, pi. 13. figs. 

 14, 14«, 1860. 



Jacksonian Eocene to Recent. Tampa silex beds at Ballast Point, 

 Tampa Bay, Florida. U. S. Nat. Mus. No. 165164. 



This species appears without perceptible change in different hori- 

 zons from that of the Jackson up to the Pleistocene and is found 

 living in moderate depths of water from the West Indies northward 

 to South Carolina. 



Genus TURBONILLA Risso. 



Turbonilla Risso, Hist. Nat. Eur. Mer., vol. 4, 1826, p. 224. Type. Turbonilla 

 plicata Risso, 1826 (not Brocchi, 1814). T. typica Dall and Bartsch, 

 Bull. U. S. Nat. Mus. No. 68, pp. 28, 29, 1909. 



Subgenus PTYCHEULIMELLA Sacco. 



Ptycheulimella Sacco, Moll. Piem. e. della Liguria, pt. 11, 1892, p. 59. Type, 

 Tornatella pyramidata Deshayes. 



