600 



liue; outer margin semicircular, posteriorly sinuated, the upper 

 angle produced and rounded. 



The plates of the gizzard are in the form of a cocked hat, or 

 sub triangular, with the beaks bent down and slightly produced. 



British Islands. Mus. Czimiuff. 



134. Bulla Scheceteui (pi. cxxv. f. 160), PAil., Enc. 

 Moll. Sicil. pi. XX. f. 2. B. aperta, Mont., Lamarch. 



B, testa subquadrato-rotunda ; margine externo semicirculari, 

 angulo ejus supero producto, acutangulo. 



Shell subquadrately rounded ; outer margin semicircular, its 

 upper angle produced, acutangular. 



The plates of the gizzard are oval, with the lateral beaks but 

 slightly produced. 



Catanuan, Luzon, K. C. 3Ius. Cuming. 



135. Bulla punctata (pi. cxxv. f. 161). Bullsea punctata, 

 Adams, Trans. Linn. Soc. pi. i. f. 6-8. 



B. testa ovato-oblonga, tenuissima, alba, peUucida, nitida, lineis 

 transversis punctatis, latere columnari arcuato, apice obtuso, vix 

 umbilicato. Long. ~ poll., lat. minus quam yL. poll. 



Shell oblong, very thin, wliite, pellucid, glossy, marked with 

 transverse dotted lines ; inner margin arcuated ; apex obtuse, with 

 a very shallow umbilicus. Length -^ inch, breadth less than 

 To inch. 



Animal cinereous, approaching to black, posteriorly yellowish- 

 white ; gizzard membranaceous. 



Great Britain. 



136. Bulla pruinosa (pi. cxxv. f. 162). Bullsea pruinosa, 

 Clark, ZooL Joui-n. 1827-28. p. 339. 



B. testa subglobosa, nivea, subopaca, subtiliter reticulata, peri- 

 pheria paululiim constricta ; margine columnari arcuato, reflexo, 

 ad mediam partem subemarginato, leviter umbilicato. 



Shell subglobose, subopake, of a dead frosted white colour, 

 delicately reticulated, appearing covered with fine gauze, circum- 

 ference of the posterior or upper part somewhat constricted ; 

 columeUar margin arcuated, a little reflected, and in the middle 

 a flexui'c or notch ; apex rather rounded and slightly imibilicated. 



Animal entirely wliite, foot very large. 



Great Britain. Mus. II. Adams. 



