CAVOLINIDiE. 15 



1. Balantium RECURVUM. 



Shell triangular, compressed, glossy, shining, transversely regularly 

 striated, longitudinally three-ribbed on the back; apex acumi- 

 nated, recurved ; aperture oblong, narrow, oblique, angled on 

 each side. 



Balantium recurvum. Children, Joum. Inst. Roy. xv. 220, t. 7; 



Rang, Mon. ined. ; Benson, Jour. Asiat. Soc. Bengal, iv. 176, 



1835, vi. 150, 1837. 

 Cleodora balantium, Bang ; Guerin, Mag. Zool. 1834, t. 44 ; Desk. 



in Lamk. Hist. ed. 2, vii. 431. 

 Hyalaea balantium, DOrh. Voy. Am. Mer. Moll. 116, t. 8, f. 1—4. 

 Cleodore bourse, Voy. Bonite Moll. t. 7, f. 11, 16. 



a. Shell. Congo Expedition. Presented by the Admiralty. 

 h. Animal of a, in spirits. Congo Expedition. Presented by 

 the Admiralty. 

 Pontica recurvum, Leach, MSS. B. M. 1819. 



2. Balantium inflatum. 



Cleodore renflee, Eydoux et Souleyet, Voy. Bonite Moll. t. 7, f. 17, 

 19. 



Hah. 



3. Balantium australe. 



Shell conical, elongate, angulose, above convex, with a slight longi- 

 tudinal groove, transversely striated ; mouth semilinear. 



Hyalaea australis, DOrh. Voy. Am. Mer. Moll. 117, t. 8, f. 9—11. 

 Cleodore australe, Voy. Bonite Moll. t. 7, f. 20, 23. 



Hah. Cape Horn. 



4. Balantium rugosum. 



Shell very much depressed, elongate, conical, flattened, slightly 

 arched, irregularly transversely grooved above and below, flat ; 

 mouth linear. 



Hyalaea rugosa, DOrh. Voy. Am. Mer. Moll. 118, t. 8, f. 12—14. 

 Hah. Pacific Ocean. 



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