FAUNA OF OETHAULAX PUGNAX ZONE, SS 



ACTEOCINA WETHERILLI (Lea). 



Acteon wetherilH I. Lea, Contr. Geol., p. 213, pi. 6, fig. 224, 1833. 

 Acteocina wctherelU Gray, Proc. Zool. Soc. London, p. 160, No. 294, 1847. 

 Tornatina wetherilU Conrad, Amer. Journ. Couch., vol. 1, p. 35, 1864. — Dall, 

 Trans. Wagner Inst., vol. 3, p. 15, 1890. 



Shell cj^lindrical, truncate above, smooth and rather solid; spire 

 short and blunt ; suture impressed ; a single fold on the pillar ; whorls 

 four; aperture narrow, about four-fifths the whole length; outer lip 

 simple, sharp. Length 5, width 2.5 mm. 



Tertiary of Deal, New Jersey (Lea). Silex beds at Ballast Point, 

 Tampa Bay, Florida; also the Tampa limestone above the silex beds, 

 and from wells dug in the vicinity of Tampa, and at La Penotiere's 

 sulphur spring. Also from the Oligocene of Santa Domingo, Trini- 

 dad, and Jamaica, West Indies. U. S. Nat. Mus. No. 97469. 



ACTEOCINA SQUARROSA, new species. 

 Plate 6, fig. 8. 



Shell of moderate size, subcylindrical, slightly wider anteriorly, 

 of about four whorls, separated by a very deeply excavated chan- 

 neled suture; the outer margin of the suture is formed by a sharp- 

 edged thin carina, the inner margin is duplicated by a layer of 

 enamel so that in the adult, in the whorls preceding the last, the 

 carina seems double-edged; nucleus small, swollen, simken so that 

 the nuclear whorl is not visible above the squarely truncated pos- 

 terior end of the shell; axial sculpture of faint vertical incremental 

 lines, somewhat irregular in strength and receding arcuately to and 

 near the carina; spiral sculpture on the anterior half of the whorl 

 at first faint, but becoming accentuated anteriorly, and extending to 

 the labial callus, composed of fine, nearly equally spaced grooves or 

 striae, apparently not punctate ; aperture as long as the shell, narrow 

 behind, where the commissure is deeply incised, wide in front ; outer 

 lip straight, sharp, simple ; body without enamel ; pillar short, almost 

 horizontally twisted, bearing a single strong plait on a heavy callus, 

 behind which is a rather deep narrow bounding furrow; anterior 

 sinus wide and deep. Length of shell 11.5, depth of sutural chan- 

 nel 1, maximum diameter of shell 5.5 mm. 



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



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

 165025. 



Genus RETUSA Bro>Arn. 



Rctusa Brown, 111. Concb. Gt. Brit., ed. 1, index and expl., pi. 38, figs. 1-6, 



1827. 

 Utriculus Brown, 111. Conch. Gt. Brit., ed. 2, p. 58, and expl. pi. 19, 1844; 



not Utriculus Schumacher, Essai, p. 203, 1817. 

 54907°— Bull. 90—15 3 



