Ill 



clavate form. Its color is a transparent yellowish-green. It has 

 twenty equidistant longitudinal strise or folds, indicating the parti- 

 tions within, which meet at a point on the base of the animal, 

 where there is no well-defined disk of attachment, but a globular, 

 inflated appearance, as in Edivardsia, On the anterior third of 

 the body, the longitudinal folds arc more prominent, and each 

 studded with a row of small elevated papillae, which are numer- 

 ous and closely arranged. These papillce are largest toward the 

 anterior extremity, and gradually diminish in size posteriorly, 

 disappearing at about the middle. The tentacula are twenty in 

 number, corresponding to the folds of the body, and are short, 

 stout, enlarged and rounded at their extremities, which are covered 

 with white dots. Five of these tentacula usually stand erect, the 

 remaining ones curving over and alternating by threes with the 

 erect ones. The animal retracts its tentacula very slowly when 

 disturbed. 



This species is found on the flats near Fort Johnson, S. C, 

 near low water mark, in considerable numbers. Its position is 

 indicated after the tide has retired, by little cracks on the surface 

 of the mud, which radiate from a small central hole. 



Lepton longipes, Stimpson. 



The genus Lepton has already been noticed on our shores, a 

 species from Florida having been described by Mr. Conrad. The 

 specimens found have almost invariably been single valves, cast 

 up on the beach, and such have been often seen on the shores of 

 South Caroliaa. In March, 1852, Lieut. Kurtz and myself had 

 the pleasure of discovering several animals of this genus alive, 

 and of ascertaining its station. It lives in sand or mud, on the 

 flats, near low water mark, at the depth of a foot below the sur- 

 face, and generally occupies the holes of marine worms and 

 fossorial Crustacea. This species, from the great length of its 

 foot, may be styled L. longipes. 



Considering the confined nature of the places it inhabits, we 

 are at once surprised by the activity it exhibits, and the high 

 development of its organs. With its peculiar foot, when ex- 

 panded, it can creep like a gasleropod, and when thus progress- 

 ing, with its two long anterior cirri or tentacles waving in ad- 

 vance, it strongly recalls that higher order of moUusks. 



