CONCHOLOGY- 115 



A. Judaa. Judas's Ear. PI. 19, fig. 6. 



Species thick, oblong, conical, with minute decussated 

 striae and granulations ; light brown; two plaits on the colu- 

 mella ; right outwardly reflected. 



A. scarabceus. The Beetle's Ear. 

 Species of which the columella has three plaits, and the 

 whole internal side of the right edge denticulated. 



A. myosotis. The dwarf Auricula. 

 Species minute, with two plaits on the columella, and one 

 tooth behind. 



A. Sileni. Silenus's Ear. 



Species very small, without plaits or teeth. 



11, Cyclostoma. Twenty-eight species. 

 A terrestrial shell, varying considerably in form, but dis- 

 tinguished by a round aperture, reflected lip, and horny oper- 

 culum. 



Shell more or less elevated, volutions rounded, summit 

 papillose ; aperture round, the edges united circularly and 

 reflected ; the left having its origin very detached from the 

 spire. 



Operculum calcareous, complete, not spiral ; summit sub- 

 central, 



Cyclostoma planorbula. Cyclostoma fasciata, 



C. volvulus. C. mumia. 



C. carinata. C. quaternata, 



C. sulcata. C. ferruginea. 



C. unicarinata. C. decussata. 



C. tricarinata. C. lineolata. 



C. obsoleta, C, mamillaris, 



C. rugosa. C. ligata. 



C. labeo. C. lincinella. 



C. interrupta. C. orbella. 



C. ambigua. C. fimbriata. 



C. semilabris. C, multilabris. 



C. flavula, C. elegans. 



C. patulum. C. truncatulum. 



