GENUS A N C Y L U S, Mutter, Gray. 



PLATE 1. FIG. 1. 



Testa simplex pATELLJEformis; apex posterior, dextro- 

 vertens: cicatrix submarginalis, sinistrorsum interrupta. 



SYNONYMS AND REFERENCES. 



PATELLA, LINNJEUS, and Linnaean authors. 

 CREPIDULA, FLEMING. Encycl. 



rfNCYLUS, MiJLLER, LAMARCK, SoWERBY. 



" LAMARCK. Animaux sans vertebres. 

 " SOWERBY. Genera of Shells. 

 " GRAY. Turton's Manual, p. 247. 



DESCRIPTION. 



ANIMAL conical, not involute, covered by the 

 concavity of the shell: head emarginate in front, 

 with a small flap upon each side; tentacles 

 short, compressed, widest at base, with the sides 

 nearly parallel: foot united to the body through- 

 out, except at the anterior extremity, where it 

 is free: mantle simple. Attached to the shell 

 by a small portion of the back of the mantle: 



L 1 



