NATURAL SCIENCES OF PHILADELPHIA. 67 



Length of shell f in. Breadth of shell in. Length of aperture 5^-16 in" 

 Breadth of aperture in. 



Hab. Coosa River, Alabama. My Cabinet. 



Obs. This species cannot well be confounded with any other yet described. 

 In general form and in its armature one is very forcibly reminded of Melania 

 annuli/era, Con., from which it differs, however, not only generically, but by 

 its more ovate base ; the carinas are lighter in color than the general body of 

 the shell, and are slightly irregular or sub-nodulous in outline ; it is a stout, 

 heavy species, and has a smaller aperture proportionally than is common in 

 the genus ; the bands within the aperture are five in number, very dark, and 

 the three central ones are disposed to be confluent ; a dark broad band revolves 

 around the base of the shell. Compared with Schizoztoma pagoda, Lea, it 

 differs in color, in its more elongate form, and by tne character of its carina?, 

 which are more uniform, the main variation being that they are more diffused 

 on the whorl, whereas, in Mr. Lea's species they are particularly conspicuous 

 near the apex. 



Gykotoma robdsta, Anthony. Shell fusiform, robust, thick, of a dark olive 

 color ; spire obtuse, consisting of one perfect whorl remaining, with marks of 

 two or three more, lost by truncation ; body whorl broad, ornamented by three 

 obscure, dark, wide bands ; fissure rather broad, curved, not deep, closed 

 behind by a cordlike cincture, very prominent, beneath which and close to it 

 is a narrow depression or furrow ; aperture narrow, ovate, banded inside ; 

 columella well rounded and covered by callus ; lines of growth very distinct 

 and much curved, rendering the shell rough by their prominence. 



Length of shell J in. Breadth of shell 9-16. Length of aperture 10-16. 

 Breadth of aperture 5-6. 



Hab. Coosa River, Alabama. My Cabinet. 



Obs. This is a large, robust species, somewhat resembling Melania ampla, 

 nob. in form, and not unlike it in coloring ; it is about the largest species I 

 have seen in this genus, and certainly not the least beautiful ; compared with 

 G. salebrosa, nob., herein described, it is larger, smoother, more inflated, and 

 has not the rib-like prominences so characteristic of that species ; the lower 

 part of the columella is somewhat flattened and thickened, and another thick- 

 ening takes place at the aperture, leaving a thinner space between the two 

 points. 



Anculosa oknata, Anthony. Shell conic, rather thick, smooth ; spire ele- 

 vated, composed of about five convex whorls ; suture distinct ; color dark 

 yellow, polished, with dark brown bands revolving around the shell ; three 

 bands visible on the body whorl and only one upon the volutions of the spire ; 

 aperture ovate, livid and banded within ; columella furnished with a callus, 

 often tinted with rose color ; sinus very small. 



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

 Phila.; State Coll., Alb., N. Y.; Smithsonian Collection. 



06s. A fine species, so much elevated as readily to be taken for a Melania ; 

 the dark bands on a yellow ground give it a lively appearance ; about one 

 hundred specimens are before me, and present very little variation ; the dark 

 bands within the aperture are very conspicuous, one being near the upper 

 angle, two others near each other, but widely separated from the first, and a 

 fourth near the base of the shell ; the middle bands are often confluent, and 

 all of them are arrested by a broad area before they reach the outer edge. 



Anculosa ligata, Anthony. Shell ovate, smooth, of a dark green color, 

 rather thick ; spire obtusely elevated, composed of about four whorls ; suture 

 very distinct ; upper whorls flattened, body whorl constricted at the middle, 

 banded ; aperture ovate, banded within ; columella deeply indented, callous ; 

 no sinus at base. 



I860.] 



