208 AMERICAN JOURNAL 



DESCRirTION or THEEE NEW SPECIES OP 

 MEXICAN LAND SHELLS. 



BY WILLIAM M. GABB, 



CYLINDRELLA, Pfr. 

 C. Eemondii, Gabb.— t. 19, f. 10—13. 



Descri'ption. — C. t. " PfeifferiV similis; albida, elliptico-ob- 

 longa; apice subtruncata ; anfractibus 12, 2| laevibus, reliquis 

 convexiusculis, dense et tenuissime oblique costatis, ultimo ad 

 basim convexo; umbilico minuto; apertura subrotundata ; 

 perist. continuo, reflexo, parum incrassato. Long. -44, lat. 'IS. 



' Locality. — \\ leagues from Arivecbi, Saliuaripa Yalley, So- 

 nora, Mexico. Sent me by M. Aug. Eemond. 



My Cabinet. Cabinet of George W. Try on, Jr. 



Closely related to C. Pfeifferii, but smaller, witli more mi- 

 nute striiB, there being nearly twice as many in the same 

 space; the nuclear whorls are rounder, and the first three or 

 four whorls below the nucleus are distinctly flattened above 

 obliquely and subangulated just above the suture, while in C. 

 Pfeifferii they are all very regularly rounded. 



Accompanying the above were numerous specimens of C. 

 Pfeifferii from the "Cerro de la Campana," near Hermosillo, 

 Sonora. 



HELIX, Linn. 



n. {Polygyra) Behrii, Gabb.— t. 19, f. 5—9. 



Description. — H. testa ^' acuteclentata^^ similis; discoidea, pla- 

 nulata; superne spira maxime depressa, infra umbilicata ; an- 

 fractibus 5, oblique et transversim costatis; anfr. ultimo ad 

 aperturam valde descendens, constricto ; umbilico angusto, 

 profundo ; apertura obliqua, tridentata, labro incrasso ; colore 

 albo(?). 



Locality. — I have had the opportunity of examining five 

 specimens of this species, all from near Guaymas, Mexico. 

 My specimens were sent me by Mr, Eemond. 



My Cabinet. Cabinet of George W, Tryon, Jr. 



