HELIX. 153 



25. HELIX SPINOSA, LEA. 



Plate XLIV. 



H. testa lenticular!, carinata, tenui, imperforata ; epider- 

 mide castanea hirsutiuscula ; spira planulata, subtus con- 

 vexa ; apertura angustissimaV columella dente unico, longo, 

 laminato, armata ; labro incrassato, sinuato, ad marginem 

 superiorem angulato et subreflexo. 



SYNONYMS AND EEFEHENCES. 



CarocoUa spinosa, Lea, Am. Phil. Trans. IV. 104, pi. 15, f. 35. 

 Helix spinoia, Binney, Boston Journ. Nat. Hist. III. 367, pi. 11, f. 2. 



Pfeiffek, Monog. Helic. Viv. I. 421. 

 Caro.oUa Edgariana, 1,ea, Proc. Am. Philos. Soc. II. 31. (var.) 

 Trans. Am. Fliilos. Soc. N. S. IX. 2. 



DESCRIPTION. 



Animal not yet observed. 



Shell lenticular, witli the upper sui-face much fla(> 

 tened, acutely carinated ; epidermis dark chestnut color, 

 with minute, hair-like processes lying flat upon the 

 whorls in the direction of their lines of growth ; whorls 

 six, of nearly uniform width, and decreasing very gra- 

 dually from the aperture to the spire ; suture distmct. 

 Slightly raised ; aperture very narrow ; lip yellowish- 

 white, near its junction with the body-whorl thickened, 

 angulated, and slightly reflected ; pillar-lip with a long, 

 yellowish, narrow, projecting tooth, extending from the 

 umbilical axis to the angle of the outer lip, and parallel 

 with its thickened edge ; base convex, with the umbilical 

 region slightly indented. 



VOL. n. 39 



