SCHIZOSTOMA. 365 



This elegant little species is widely separated in form and 

 ornamentation from any other of the genus. In both these 

 respects it reminds one strongly of Mr. Lea's Ancidosa for- 

 mosa. 



15, S. pagoda. Lea. 



Schisostoma pagoda, Lea, Philos. Proc, iv, p. 1G7, Aug., 1845. Pliilos. Trans., x, 



p.G7, t. 9, f. 52. 1«53. 

 Gyrotoma pagoda, Lea, Chentt, Manuel, i , f. 2.020. BrNNEY, Check List, No. 327. 

 Brot, List, p. 27. Adams, Genera, i, p. 305. 



Description. — Shell cariuate, conical, rather thick, dark horn-color; 

 spire rather short; sutures very much impressed; whorls six; fis- 

 sure small ; aperture elliptical, within whitish ; columella smooth. 



Habitat. — Tuscaloosa, Alabama. 



Diameter, "35 ; length, '75 of an inch. 



Observations. — Three of this interesting species are before me. 

 They are very distinct, and may easily be known by the carina 

 being very acute on the superior whorls, presenting the -p- ggg 

 appearance of a Chinese pagoda. The lower whorl is 

 slightly and irregularly striate. The Assure is not deep, 

 but rather wide, being about one-fifth the length of the 

 whorl. The columella at the base is rather angular. 

 The aperture is rather more than one-third the length 

 of the shell. — Lea. 



This excellent species in form belongs to that group of 

 which S. carinifera, Anthony {Showalterii, Lea) may be con- 

 sidered the t3^pe. It is not so large a shell as that species, nor 

 is it so strongly carinate. It is also allied to /S. Wetumj)- 

 kaense. Lea, but is a more elongated shell. The locality given 

 is extremely doubtful. Mr. Reeve figures two distinct species 

 for S. pagoda: — his fig. la is ^S*. Wetumpkaense., Lea, and fig. 

 16 is S. Buddii, Lea. It is doubtful whether Mr. Brot has 

 recognized this species, as he refers to Mr. Reeve's figures. 



16. S. pyramidatum, Suuttleworth. 



Gyrotoma pyramidatum, Shiittmcwoimii, jMitt. Bern. Nat. Gesell.. No. M, p. 88, 

 July 22, 1845. BiNNEY, Check List, No. 32'J. Buor, List, p. 27. Adams, Gen 

 era, i, p. 305. 



Description.— Shell pyramidal, thickened, olivaceous or blackijili, 



