24 BULLA. DIPPER. 



transparent, clear white, irregularly wrinkled transversely 

 but glossy on the outside, almost entirely open, rounded 

 and dilated at the base, a little narrowed at the crown 

 which has a slight indenture ; outer-lip extending beyond 

 the crown ; inner-lip slightly turned in, rendering the pillar 

 or involution quite visible to the end : length more thau 

 half an inch ; breadth rather leas. 



The animal also possesses a gizzard something resem- 

 bling that of the B. lignaria, but it is of a more regularly 

 triangular form, with the base elongated ; and the supple- 

 mental plate, which is placed within the base of the triaa- 

 g'ulur ones, is of a lozenge shape, or quadrangular, with the 

 points of two of the angles elongated. Fig. 5, 6. 



Western coasts, Dublin bay, Scotland, v. v. 



12. Bulla Catena. Chain Dipper. 

 Moniagu, pi. 7- fig- 1 



Bulla -punctsita. Linn. Trans, v. pi. 1. f. 6, 7, 3. 



Shell somewhat oval, white, transparent, glossy, with 

 numerous fine transverse striae which run rather obliquely 

 and with the assistance of a magnifier seem to be connect- 

 ed and interwoven in a chain-like manner : aperture very 

 large, almost entirely open like B. aperta, but closing at 

 the crown, which is obtuse and turned in so as to form a 

 single volution 5 inside glossy, the pillar-lip a little spread: 

 length about the tenth of an inch ; breadth not so much. 



Variety, with a more transparent single zone round it, 

 taking in eight or tea of the chain-like stria?, the othei* 

 parts appearing frosted and not so glossy; the crown 

 little concave, and the outer margin of the aperture close 

 to the body reflecting a little and forming a depression on 

 that part. 



Western coasts, and North Britain : rare. v. m. 



13. Bulla haliotoidea. Ear-shaped Dipper. 

 Montagu, pi. 7- f. 6 Dorset Cat. pi. 22. f. 5 *. 



Shell somewhat oval, white, extremely thin, transparent, 

 very slightly wrinkled on the outside : aperture broad oval, 

 not quite extending to the crown, which is small, obtuse, 

 and twisted sideways into about two volutions : inner-lip a 

 little turned in ; the made visible to the end. It differs 



from 



