292 MOLLUSCA. BRANCHIFERA. Bulla. 



Lamellaria mem. Mont. Linn. Trans, xi. 184. t. xii. f. 3; the shell fig. 4. 

 — English coast. 



Length and breadth about two inches ; of a brownish colour, paler above, 

 and spotted with bluish-grey beneath ; tentacula subcylindric, with two eyes 

 at the base ; a cylindrical snout ; shell ovate, very thin, p flat, with a minute 

 lateral whorl ; silvery, tinged with pink. 



Gen. XLVI. BULLA. — Body in front with a fleshy expan- 

 sion or tentacular disc ; behind with a membranaceous ap- 

 pendage or lid ; shell convoluted ; aperture the whole length 

 of the shell. 



* Shells with a cuticle, external. 



170. B. lignaria. — Shell ovate, spirally striated; mouth wide, 



anteally, rendering the pillar visible to the end. 



Concha veneris major leviter et dense striata, List. Conch, t. lxxiv. f. 11. 



— B. lig. Linn. Syst. i. 1184. Penn. Brit. Zool. iv. 11C B. scabra, 



Mull. Zool. Dan. t. 71 — B. lig. Mont. Test. Brit. 20G Not uncom- 

 mon. 



Length upwards of 2 inches ; width 1 \t\\ of an inch ; epidermis brown ; aper- 

 ture contracted retrally by the body-whorl ; the apex depressed; pillar-lip 

 rounded ; outer lip nearly straight ; gullet large, tblded ; stomach fortified by 

 three testaceous plates. 



■171. B. akera. — Shell ovate, smooth ; aperture wide, and ren- 

 dering the pillar visible. 



Akera bullata, Mull. Zool. Dan. t. lxxi. f. 2, 9.— B. resiliens, Don. Brit. 



Shells, t. lxxix B. akera, Mont. Test. Brit. 219 — On the shores of 



Banff and Devon. 



Length about |ths of an inch ; breadth half an inch ; translucent, elastic, 

 glossy, with a greenish tinge. Aperture wide anteally ; retrally it is very 

 close to the body-whorl, but does not adhere until it has taken almost one vo- 

 lution ; apex concave, exhibiting two or three volutions. The ltev. Charles 

 Cordiner observed this shell in the Murray Frith, and transmitted specimens 

 to the Duchess of Portland. — On some parts of the English coast it is not un- 

 common. 



-* 172. B. liydatis. — Shell subglobular, minutely striated spiral- 

 ly ; aperture wide anteally ; the pillar-lip rounded, but the pil- 

 lar not visible to the end. 



Linn. Syst. i. 1183 — B. ampulla, Penn. Brit. Zool. iv. 11G.--B. hyd. 



Don, Brit. Shells, t. lxxxviii On the English coast. 



Length 1 inch ; breadth f ths ; translucent, with a brownish epidermis ; 

 aperture interrupted by the rounded body-whorl ; apex concave, but not ex- 

 hibiting volutions. Animal purplish-brown ; and, when expanded, double 

 the length of the shell; two eyes on the tentacular disc, sunk in small white 

 depressions Mont. Linn. Trans, ix. 10G. t. vi. f. 1. 



173. B. Cranchii. — Shell subcylindrical, strongly striated spi- 

 rally ; aperture narrow, rendering the continuation of the pillar 

 invisible ; pillar-lip straight. 

 Mr Prideaux, Plymouth Sound. 



