87 



[J. A. N. S. vol. ii. p. 257, June, 1822.] 



Natica pusilla. — Shell thin, suboval, cinereous or rufous, 

 with sometimes one or two obsolete, dilated, revolving bands ; 

 columella callous ; callus pressed laterally into the umbilicus, 

 whitish ; umbilicus nearly closed and consisting only of an arquat- 

 ed, linear, vertical aperture. 



Length about a quarter of an inch. Inhabits the southern 

 coast. Cabinet of the Academy and Philadelphia Museum. 



A small species, generally mistaken for the young of one of the 

 preceding species. 



Thodoxus reclivatus. — Shell thick, strong, globose-oval, 

 greenish-olive, with numerous, approximate, parallel, irregularly un- 

 dulated green lines across the volutions ; volutions about three, the 

 exterior one occupying nearly the whole shell ; spire very short, 

 obtuse at the apex, and frequently eroded to a level with the supe- 

 rior edge of the body whirl ; mouth within bluish-white ; labrum 

 acutely edged ; labium callus, minutely crenated on the edge, and 

 with a very small tooth near the middle. 



Greatest diameter nineteen-twentieths of an inch, greatest trans- 

 verse diameter four-fifths of an inch. Inhabits East Florida. 

 Cabinet of the Academy and Philadelphia Museum. 



Animal. — Pale, more or less distinctly lineated, or clouded with 

 black ; foot rounded, almost orbicular, harrdly as long as the shell 

 is broad; above with four more or less distinct, black, parallel 

 lines ; rostrum dilated, truncated, tip with four black lines, a black 

 band connecting the eyes : eyes prominent, appearing to be placed 

 on a tubercle at the outer base of the tentacula, black with a white 

 orbit; tentacula with darker or black lines, setaceous, and longer 

 than the breadth of the rostrum ; beneath immaculate. 



I found this species in great plenty, inhabiting St. John's river 

 in East Florida, from its mouth to Fort Picolata, a distance of one 

 hundred miles, where the water was potable. It seemed to exist 

 equally well where the water was as salt as that of the ocean, and 

 where the intermixture of that condiment could not be detected 

 by the taste. Its movements are remarkably slow. 



