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BULLAZANA. —3 Genera. 
Acera.—This genus has no shell. 
Buti#a.—Shell very thin, partially rolled and spiral on one side, without columella, and 
without spire; the aperture very large, dilated at the upper part. 
Plate XIV. Fig. 8. B. aperta. (Bulla aperta.—Linn.) 
Buxta.—Shell univalve, ovate-globular, convolute, no columella, spire not projecting: 
aperture the whole length of the shell; external margin sharp. 
Plate XIV. Fig. 9. B. lignaria. (Idem.—Linn.) 
APLYSIANA.—2 Genera. 
Aptysta.—Shield dorsal, semicircular, subcartilaginous. 
Plate XIV. Fig. 10. A. radiata. 
(a) Outside of ditto. 
DotaseLta.—Shell oblong, slightly arched, hatchet-shaped, contracted, heavy, callous, 
almost spiral on one side, and larger, flatter, and thinner, on the other. 
Plate XIV. Fig. 11. D. Rumphii. (Bulla dubia.) 
(a) Under side of ditto. 
SECTION II. PNEUMOBRANCHI. 
Turs Section contains only One Family, viz. Limaciana. 
LIMACIANA. —5 Genera. 
Oncuipium.—This genus has no shell. 
ParMAceLLa.—Lamarck has given a description of the animal of this genus, but only 
mentions that the scutcheon contains a shell, without describing it. 
Plate XIV. Fig. 12. P. calyculata. (Sowerby’s Genera.) [Mr. H. Stutchbury’s Cabinet.] 
(a) Under side of ditto. 
Limax.—Lamarck merely mentions that the animal is “ furnished with a coriaceous sub- 
rugose shield. 
Plate XIV. Fig. 13. L. rufus. [British Museum. ] 
TrsTaceLLta.—Shell very small, external, rather ear-shaped, slightly spiral at its summit; 
the aperture very large, oval, obliquely dilated; the left margin involute. 
Plate XIV. Fig. 14. T. haliotidea. [Mrs. Mawe’s Cabinet. ] 
(a) Under side of ditto. 
VitRinA.—Shell small, very thin, depressed, terminated above by a very short spire, the 
last whorl very large: Aperture large, rounded-oval; the left margin arched, 
slightly involute. 
Plate XIV. Fig. 15. V. pellucida. 
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