80LIDULA. 



Synopsis of Genera. 



a Columella provided with a spiral fold. 



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

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

 umella hearing a massive, bifid fold. 



66 Genus ACTION Montf. Shell compact, with short spu 

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

 length of the shell, narrowed above, the columella bearing 

 a single, simple, spiral fold, 

 c. S.-g. ACT/I < >N M'.ntf. Columella curving regularly into 



the basal lip. 

 cc. S.-g. RICTAXIS Dall. Columella obliquely truncated at 



base. 



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

 rited, the spire produced ; aperture short, generally less 

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

 with a small oblique fold. 

 00, Columella with no distinct spiral fold above; shell Impel 



or nearly so. 



6. Genus ACTJCONINA Orb. Shell shaped like Actoon, 

 ovate, with elongated aperture, the columella with no 

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

 angulated below the sutures. 



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

 short spire and long aperture; columella vertical, trunc- 

 ated at base. 



666. Genus OVULACT.EON Dall. Shell Cyprseiform, in- 

 volute, with an apical perforation as in Enlln. Aperture 

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

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

 6. Genus KLEINELLA A. Ad. Shell ovate, umbilicato, 

 surface cancellated; spire produced ; aperture elongated, 

 angular In-hind, produced and entire in front. A doubt- 

 ful member of this family. 



Genus SOLIDULA Fischer de Waldhoim, 1807. 



SolidulaF .1.- \V.. Mus. Demidoff, iii, 1807, p. 226, type Valuta 

 w/idufaLinn.-A. A,.. I*. / I, p. W.-Dactyhi* Scin M., 



Essai, etc., p. 70, 234, 1817, type Voluta solidula Linne. Buccm- 



