68 PROCEEDINGS OF THE ACADEMY OF 



Hub. Alabama. My Cabinet; Cab. Hugb Cuming; A. N. S., Philad.; 

 State Coll., Albany, N. Y.; Smithsonian Collection. 



Obs. This species, of which I have some twenty or thirty individuals before 

 me, seems remarkably constant in character for an Anculosa, and not readily 

 mistaken for any other ; its color, which is a dirty dark green, is but poorly 

 relieved by the faint bands on the whorl ; nevertheless, it is an interesting 

 species, and one which will always attract attention; its most prominent 

 character is the constriction on the body whorl, which gives the appearance of 

 a cord having been drawn tightly around it while in a yielding state. 



Anculosa corpulenta, Anthony. Shell ovate or broad ovate, smooth, 

 thick ; spire rather elevated ; composed of 4-6 subconvex whorls ; suture 

 decidedly impressed ; aperture very broad, ovate, ample, banded inside ; col- 

 umella well rounded, slightly covered with white callus, and with a slight in- 

 dication of sinus at base. 



Bab. North Carolina. My Cabinet ; Cab. Hugh Cuming, London ; A. N. S., 

 Philada.; State Coll. Albany, N. Y.; Smithsonian Collec, Washington, D. C. 



Obs. Cannot well be confounded with any of its congeners ; it is unusually 

 elevated for an Anculosa, resembling more a Paludina in that respect ; the 

 whorls are regularly but not abruptly shouldered, and are often excavated 

 with a narrow channel at the middle ; striae and even indistinct carinae are 

 often visible, but are not a constant character ; the bands within the aperture 

 are not always well defined and are sometimes wanting altogether ; when 

 present they are generally five in number, and are arrested by a narrow white 

 space at the outer lip ; body whorl often subangulated. 



Occurs in Dan river, North Carolina, in company with Anculosa canalifera, 

 nob., and appears to be very common. Several hundred specimens of various 

 ages are now before me. 



Anculosa canalifera, Anthony. Shell ovate, costate, of a brown color, thin ; 

 spire acutely elevated, composed of 5 6 sharply carinate whorls ; suture not 

 very distinct ; aperture about half the length of the shell, ovate, banded in- 

 side ; columella deeply indented ; sinus none. 



Hab. North Carolina, in Dan river. 



My Cabinet; Cab. Hugh Cuming, London; A. N. S., Phila.; State Coll., 

 Albany, N. Y.; Smithsonian Coll., Washington, D. C. 



Obs. One of our most curious and beautiful species, which no one can easily 

 mistake ; the whole shell is crossed with sharp, elevated costae running around 

 the whorls and corresponding deep grooves between them ; about five costae on 

 the body whorl ; a less number on the spire volutions ; these ribs appear as 

 dark bands in the interior of the aperture, and there is a broad non-elevated 

 band at the base of the shell ; differs from Anc. costata, nob., by the size and 

 prominence of its ribs and by its elevated spire. 



Anculosa viridula, Anthony. Shell ovate, of a uniform dark green color, 

 rather thin ; spire much elevated, composed of 4 5 convex whorls ; sutures 

 very distinct ; aperture ovate, large, about half the length of the shell, livid 

 inside ; columella well rounded ; has a broad but not well defined sinus. 



Hab. Tennessee. My Cabinet ; Cab. Hugh Cuming, London ; A. N. S., 

 Philada.; Smithsonian Coll., Washington, D. C. 



Obs. In form and coloring this species resembles Paludina decisa, Say, when 

 that is about half grown, and but for its operculum one would hardly deem it 

 an Anculosa; it is a plain, unadorned species, not liable to be confounded with 

 any other ; its body whorl is large and subangulated ; lines of growth well 

 defined and close ; it has a slight disposition to shouldering at the suture ; it 

 is not an abundant species so far as at present known. 



Anculosa patula, Anthony. Shell ovate, of an uniform dark horn color, 

 rather thin ; whorls 4 5, convex ; sutures very distinct ; aperture semicircu- 



[Feb. 



