HELIX. 153 



25. HELIX SPINOSA, L.EA. 

 PLATE XLIV. 



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

 mide castanea hirsutiuscula ; spira planulata, subtus con- 

 vexa ; apertura angustissima ; columella dente unico, longo, 

 laminate, armata ; labro incrassato, sinuato, ad marginem 

 superiorem angulato et subreflexo. 



SYNONYMS AND REFERENCES. 



Carocolla spinosa, LEA, Am. Phil. Trans. IV. 104, pi. 15, f. 35. 

 Helix spi'i'tsa, BINNEY, Boston Journ. Nat. Hist. III. 367, pi. 11, f. 2. 



PFEIFFER, Monog 1 . Helic. Viv. I. 421. 



Caro olla Edgariana, LEA, Proc. Am. Philos. Soc. II. 31. (var.) 



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



DESCRIPTION. 



ANIMAL not yet observed. 



SHELL lenticular, with the upper surface much flat- 

 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 distinct, 

 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, extendimg 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. 



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