172 Binney on the Naked Air-Breathing Mollusca 



DESCRIPTION. 



Color of upper surface whitish, or yellowish white, varie- 

 gated with clouds and spots of brownish and blackish, so 

 arranged as to form three ill-defined longitudinal bands, one 

 on the centre of the back, and one on each flank, extending 

 from the head to the posterior extremity, anastomosing more 

 or less with each other, and having smaller spots of the same 

 color between them ; inferior margin white, or yellowish ; 

 foot whitish. Mouth surrounded with a circular row of 

 papillae. Body elongated, sub-cylindrical, flattened towards 

 its posterior extremity, which is obtuse ; superior tentacles 

 one fourth of an inch long, brownish or blackish, stout, ter- 

 minating in a bulb ; ocular points on the superior part of the 

 bulb ; inferior tentacles immediately below the upper, white, 

 very short, nearly conical. Mantle fleshy, covering the whole 

 body, its anterior edge tinged with brownish, and falling in a 

 shght curve between the two superior tentacles, reaching on 

 the sides to the superior margin of the foot ; posterior extrem- 

 ity rounded ; cuticle covered with irregular vermiform glands, 

 anastomosing with each other, and having a general tendency 

 to a longitudinal direction, with shallow furrows between, 

 lubricated with a watery mucus, and susceptible of contrac- 

 tions which produce a slow, undulatory motion, like the 

 flowing of water, over the whole surface. Foot whitish, 

 extending a little beyond the mantle posteriorly, showing a 

 whitish flattened border. Orifice of the organs of generation 

 on the right side at a little distance behind and below the 

 superior tentacle. Respiratory orifice large, on the right side, 

 one fourth of an inch behind the origin of the superior tenta- 

 cle ; anal orifice in close contact, a little above and in front of 

 it ; above the respiratory orifice on the back is a deep curved 

 furrow, running upwards and backwards. Locomotive band 

 not distinguished from the lower surface of the foot. 

 Greatest length, when fully extended, four inches. 

 Geographical Distribution. Was noticed by the origin- 

 al discoverer in South Carolina ; is common in Vermont, the 

 western part of Massachusetts, New York, and Ohio : and was 



