CAV0LINID5-. 5 



Synopsis of the Genera. 



Cavolina. Shell subglobular. Mouth contracted, with a se- 

 parate lateral slit on each side. 



DiACEiA. Shell globular. Mouth contracted, with a contiguous 

 slit on each side. 



Clio. Shell elongate, angular, conical. Mouth expanded, 

 without any lateral slit. 



Balantium. Shell triangular, depressed, transverse, waved. 

 Mouth oblong, narrow, oblique, without any side slit. 



Vaginella. Shell oblong, ventricose, smooth ; apex conical. 

 Mouth contracted, narrow, transverse, without any side slit. 



Styliola. Shell conical, subcylindrical, tapering. Mouth ex- 

 panded, without any lateral slits. 



A. Shell with lateral slit^ emitting the mantle. 

 1. CAVOLINA. 



Body short, sometimes furnished with lateral appendages. — Shell 

 globular ; mouth narrower than the internal cavity, with a late- 

 ral slit on each side, interrupted in front. 



Cavolina (tridentata),G^iol^ii,Z)e5c. 4to, Naples, 1783; Ahild. Skrivt. 



Naturg. Selsk. i. 171, 1791, not Brug. 1792; Schum, Essai, 9. 

 Tricla (tridentata), Retzius, Nov. Gen. 1788. 

 Rheda, Humph. Mus. Cat. 1797. 

 Hyalaea, Lamk. Prod. 1799 ; Syst. A. S. V. 139, 1801 ; Hist. vi. 



284, ed. 2, vii. 413 ; Cuvier, Anat. Comp. 1800 ; Ann. du Mus. iv. 



223, 1804 ; D'Orb. Mol. Cuba. 

 Hyaleus (tridentata), Montf. Conch. Syst. ii. 47, 1810. 

 Hyalea globulosae. Rang, Man. 114, 1829. 

 Hyalus, Froriep ^ Meckel. 

 Hyaleae, Schweigger, Naturgesch. 749, 1820 ; Deshayes; Van Beneden, 



Nov. Mem. Acad. Brux. xii. 1839 ; Cantraine, Malac. Medit. 23, 



1841 ; UOrh. Moll. Cuba, 1, 71. 

 Anomia sp., Forsk. Faun. Arab. 1776. 

 Fissurella sp., Brug.; Megerle, 1811. 

 ? Archonta, Montf. C. S. ii. 50, 1810. 

 ? Glandiolus, Montf. C. S. i. 314, 1808. 

 Monoculus sp., Lesson. 

 Caulina, Poli, Test. Sicil. 



B 3 



