SCHIZOSTOMA. 375 



23a. S. Showalteriana, Lea. 



Schizostoma Shoicalierii, Lea, Proc. Acad. Nat. Sci., 112, 18G4. Obs., xi, p. 105, 

 t. 23, f. 56. 



Description. — Shell, smooth, cylindrical, elevated, thick, honey- 

 yellow, without bands ; spire exserted ; sutures very much impressed, 

 furnished below with a coi'd ; "whorls flattened ; fissure rather small ; 

 aperture small, elliptical, white within; outer lip acute, somewhat 

 sinuous ; columella somewhat thickened above and below. 



Operc'dum elongate, dark brown. 



Habitat. — Coosa River, Alabama; E. R. Showalter, M.D 



Diameter, -oi of an inch; length, 1-2 (?) inches. 



Observations. — This speeies, of which I have but a single specimen, 



is the highest in the spire of any I have seen, and it is to be regretted 



that, it is not more perfect, the three lower whorls only remaining. 



These, however, indicate a high spire, which is not common 



ri?. 707. 

 m the genus. The lower whorl reminds one of constrictum 



(nobis), but that species is short, not so thick, has a larger 



aperture, and the callus is not so thick on the columella. 



It also has a constriction around the body-whorl which this 



species has not. It is also devoid of the well marked cord 



which runs round the sutures of this species, which cord is 



ver3- remarkable. There are a few iridescent strife on the upper part 



of the last whorl in this specimen. Being an imperfect specimen, 



neither the number of whorls nor the proportion of the aperture can 



be ascertained. In a former paper I named a fine Schizostoma after 



Dr. Showalter, which he sent to me as new; but I find that Mr. 



Anthony had very shortly before described the same shell under the 



name of carinifera. Wishing very much that Dr. Showalter's name 



should be permanent in a genus to which he has so much contributed 



in bringing so many new species to light, I dedicate this fine species 



to him, as an acknowledgment of the debt due to him by all students 



of malacology. — Lea. 



The specific name Showalterii having become a synonj'me, 

 it cannot be revived by the same autlior for another species 

 in the same genus. To obviate all difficulty, I have slightly 

 changed the termination of the name. 



