THE NAUTILUS. 137 



Sumutogyrus umbilicatus n. sp. PI. v, fig. 5. 



Shell small, glol)Osely depressed, umbilicate, light greenish-yellow, 

 smooth, except for the fine, rather unequal, lines of growtii. Spire 

 short, obtusely elevated. AVhorls 3i, those of the spire convex and 

 separated by a well-impressed suture ; body whorl large, gibbously 

 convex. Aperture sub-circular, rather longer than broad, obtusely 

 angled above and slightly flattened along the basal margin. Colu- 

 mella concave, narrowly reflected : columellar callus, moderately 

 heavy, rounded, reflected over but not concealing the round, deep 

 umbilicus, thin and transparent on the parietal wall. Alt. 3, diam. 



3 mm. 



Coosa river at Wetumpka, Ala. (type locality), also at Fort Wil- 

 liams Shoals above Farmer, Ala. 



This species is remarkable for its depressed, valvata-like form and 

 round, deep umbilicus, which readily differentiates it from all other 

 known species of the genus. It does not appear to be very abundant 

 at Wetumpka, and only a single example was collected at Fort Wil- 

 liams Shoals. 



Somatogyrus coosaensis n. sp. PI. v, figs. 6 and 7. 



Shell small, globose, imperforate, light yellow, smooth, with very 

 fine lines of growth. Spire very short, apex obtuse. Whorls 3^, 

 rapidly increasing, those of the spire but slightly convex and sepa- 

 rated by a very shallow suture ; body-whorl inflated, large and 

 convex. Aperture large, very oblique, expanded and well rounded 

 above, obliquely flattened at the base. Columella concave, with a 

 heavy, flat callus, which entirely covers the umbilicus, but rapidly 

 attenuates above the axis ; parietal wall with a thin transparent 

 callus. Lip simple, the upper extremity projected along the body 

 whorl at its insertion, at which point it is abruptly curved in to meet 

 the parietal wall and rapidly drawn back below, forming a decided 

 angle where it unites with the base of the columella. Alt. Z\, diam, 



4 ram. 



Coosa river at Wetumpka, Ala. (type locality), also five miles 

 above Wetumpka, and at Fort Williams Shoals above Farmer, Ala. 

 Very abundant at the first two localities, but only a single specimen 

 was taken at the last. This species is about the size of S. currier' 

 tonus (Figs. 8 and 9) to which it is closely related, but differs in the 

 less elevated spire, slightly impressed suture, regularly rounded body 



