NATURAL SCIENCES OP PHILADELPHIA. 65 



06s. A fine cylindrical species, whose chief characteristics are its very 

 smooth, polished surface, plain russet color, and flat, truncate spire ; the 

 lines of growth are unusually strong in this species, and the darker lines in- 

 dicating the terminus of previous mouths are very distinct and numerous, 

 evidencing frequent and many pauses in its growth ; the columella is much 

 bent near its base, and a narrow but distinct sinus is formed at about the mid- 

 dle space between the outer lip and columella. A single specimen only is be- 

 fore me, but seems so very distinct from all others that I have no hesitation in 

 considering it new. 



Gykotoma quadrata, Anthony. Shell short, smooth, fusiform, rather thick, 

 olivaceous; spire short, composed of about 4 very low whorls, the upper two 

 being partially obliterated by erosion ; fissure rather broad, waved, but not 

 remarkably deep ; sutures distinct ; whorls distinctly but not squarely 

 shouldered ; aperture elliptical, occupying more than half the length of the 

 shell ; within 3 banded ; columella with a light callous deposit. 



Length of shell 9-16 in. Length of aperture 6-16 in. Breadth of shell 7-16 

 in. Breadth of aperture 3-16 in. 



Hab. Coosa River, Alabama. My Cabinet ; Cab. H. Cuming, London. 



Obs. The most remarkable characteristic at first view of this species is its 

 short, square form ; its color is dark, and the bands which are very broad are 

 not very distinct; hence its general aspect is not so pleasing to the eye as many 

 others ; the fissure is broadly separated from the body of the shell, outer lip 

 very sharp and sinuous, forming, with the columella, a small not very distinct 

 sinus at base. In form it approaches most nearly perhaps to G. salebrosa, nob., 

 but is more delicate in texture, thinner, and has no armature as in that 

 species. 



Gykotoma bulbosa, Anthony. Shell striate, ovate, moderately thick, dark 

 olive ; spire obtusely elevated, subtruncate, 4 whorls only remaining ; whorls 

 of the spire subconvex ; sutures very distinct, rendered more so by the 

 shouldering of the whorls ; body whorl inflated, subangulated a little below 

 the suture, from which angle it shelves towards it, and having 2 or 3 dark, 

 broad bands revolving round it ; lines of growth curved and very distinct, al- 

 most like crowded ribs ; fissure perfectly strait, very narrow and not deep ; 

 aperture rather long, of a dusky color within and ornamented by 3 broad and 

 distinct bands there ; columella smooth, except at the lower part, where it is 

 slightly thickened. 



Length of shell 9-16 in. Length of aperture_5-16 in. Breadth of shell |in. 

 Breadth of aperture 3-16 in. 



Hab. Coosa River, Alabama. My Cabinet. 



06s. A short ovate species resembling in some respects G. ovalis, nob., 

 herein described ; it is less elevated than that species, more ventricose, and its 

 surface is rougher ; indeed, there seems to be indications of obscure folds on 

 the body whorl of this species near the suture, which in very old specimens 

 may be more fully expressed, and thus bring it into close affinity with M. sale- 

 brosa, nob. These folds, which were noted by Swainson as a generic character 

 in his original type, and which are wanting in all the species since published, 

 and now re-discovered, are exceedingly interesting in that connexion. 



Gyrotoma ovalis, Anthony. Shell smooth, oval, olivaceous, moderately 

 thick ; spire obtusely elevated, composed of about 5 6 convex whorls, of 

 which 2 are generally lost by truncation ; sutures deeply impressed ; aperture 

 broadly elliptical, banded within ; fissure direct, exceedingly narrow and 

 very deep, extending nearly one half around the shell ; columella slightly 

 curved by a callus. 



Length of shell 10-16 in. Length of aperture 7-16 in. Breadth of shell 

 7-16 in. Breadth of aperture 4-16 in. 



Hab. Coosa River, Alabama. My Cabinet. 



06s. A fine symmetrical species remarkable for its regularly oval form and 



I860.] 



5 



