136 SOLTDULA. 



Synopsis of Genera. 



a. Columella provided with a spiral fold. 



b. Genus SOLIDULA Fischer. Shell compact, solid, ovoid, 

 with short spire ; aperture long, narrow above, the col- 

 umella bearing a massive, bifid fold. 

 bb. Genus ACTiEON Montf Shell compact, with short spire 

 and large, ovate body-whorl; aperture over half the 

 length of the shell, narrowed above, the columella bearing 

 a single, simple, spiral fold, 

 c. S.-g. Action Montf Columella curving regularly into 



the basal lip. 

 ee. S.-g. RiCTAXis Dall. Columella obliquely truncated at 

 base. 

 bbb. Genus LEUCOTINA A. Ad. Shell ovate or ovate-tur- 

 rited, the spire produced ; aperture short, generally less 

 than half the shell's length, ovate or oblong ; columella 

 with a small oblique fold. 

 aa. Columella with no distinct spiral fold above; shell imperforate 

 or nearly so. 

 6. Genus ACT^ONINA Orb. Shell shaped like Action, 

 ovate, with elongated aperture, the columella with no 

 fold above, not truncated at base ; whorls more or less 

 angulated below the sutures. 

 bb. Genus BULLINA Fer. Shell ovate or oblong, with 

 short spire and long aperture; columella vertical, trunc- 

 ated at base. 

 bbh. Genus OVULACT^ON Dall. Shell Cypr^iform, in- 

 volute, with an apical perforation as in Bulla. Aperture 

 narrow, as long as the shell ; columella without plaits. 

 aaa. Columella without plaits. Umbilicus open ; surface cancellated. 

 b. Genus KLEINELLA A. Ad. Shell ovate, umbilicate, 

 surface cancellated ; spire produced ; aperture elongated, 

 angular behind, produced and entire in front. A doubt- 

 ful member of this family. 



Genus SOLIDULA Fischer de Waldheim, 1807. 



Solidula F. de W., Mus. Demidoff, iii, 1807, p. 226, type Voluta 

 solidula Linn.— A. Ad., P. Z. S., 1854, p. &{).—Dactylus Schum., 

 Essai, etc., p. 70, 234, 1817, type Voluta soli(hda lAimL—Buccin- 



