498 CYPRiEADiE. 



elongated, channelled at both ends, narrow, with the outer 

 lip reflected, smooth or denticulated, the inner lip eon- 

 stantlv smooth. No operculum. 



The animal, when crawling, extends its mantle-lobes 

 over a great part of both sides of the shell. They are 

 smooth or tuberculated. Head rather broad, muzzle- 

 shaped, tentacula long, eyes on bulgings at their external 

 bases. Male organ large, compressed, curved, reflected. 

 Branchial plume single. Jaws strong, corneous ; lingual 

 ribband short. 



The distinctions between Ovula and Cyprtea are very 

 slight, although there is no difiiculty in drawing a line 

 between the species of the two genera. The kinds of 

 Ovula have been grouped under several subgenera; our 

 British species belong to the section to which the names 

 Volva and Radius have been applied. It has been pro- 

 posed of late to revive the pre-linnwan name Amjihiperas 

 for the Ovula. Such a change would only lead to incon- 

 venience without corresponding benefit. 



0. PATULA, Pennant. 



Not minute, oblong-subfusiform ; mouth open, peaked at both 

 ends ; pillar perpendicular below. 



Plate CXIV. B. f5g. 1, 2, and (Animal) Plate N. N. fig. 1 — 4. 



Bulla patula. Pennant, Brit. Zool. ed. 4, vol. iv. p. 117, pi. 70, f. 85, a. — 



PuLTENEY, Ilutchins, Hist. Dorset, p. 40. — Mont. Test. Biit. 



vol. i. p. 207 ; Suppl. p. 93. — Donov. Brit. Shells, vol. iv. 



pi. 142 (on text, 14.'j); in Rees' Cyclop, pi. Elem. Conch. 2, 



f. 13. — Maton and Rack. Trans. Linn. Soc. vol. viii. p. 121. 



— Rack. Dorset Catalog, p. 43, pi. 12, f. 8. — -Turt. Conch. 



Diction, p. 21, f. 27, 28.— Dillw. Recent Shells, vol. i.p. 475. 



—Wood, Index Testae, pi. 18, f. 8. — Gratel. Sur les Bull. 



(and in Bull. Linn. Bordeaux), p. 28. 

 Volva „ Fleming, Brit. Anim. p. 331. 



