B U L L A 



Genus BULLA. 



Testa convoluta, ovaia, solida, lavigata, apice nmbUicato, 

 spira immersd ; aperUird pyriformi ; lahro simplici, 

 supra spiram elevaio ; lithio super (itifraduni nUimiim 

 externa ; columelld arcnutd, uicrnssatd ; opcrcido 

 nullo. 

 Sliell convolute, ovate, solid, smooth, apex unibilicated, 

 spire immersed ; aperture pyriform ; outer lip simple, 

 raised above the spire ; inner lip extended over the 

 body whorl ; columella arched, thickened ; opercuhun 

 none. 

 In the monograph of Bulla by Mr. A. Adams, pub- 

 lished in Sowerby's Thesaurus, the species are arranged in 

 groups named " subgenera. " Some of these groups differ 

 from each other so materially in the structure of the ani- 

 mal, as well as in the form and substance of the shell, 

 that it seems more correct to monograph them separately 

 as geni'ra. They will, however, appear consecutively, and 

 a general index will be given of the species of the fami/g. 

 The shells of true Bulla differ from those of the other 

 genera in the solidity of their substance and their por- 

 ceUauous surface. Of the nineteen species enumerated, a 

 large proportion are natives of the western hemisphere, as 

 the West Lidia islands and California. Others are found 

 in Australia and the I'hilippine Islands. 



Species 1. (Mus. Cuming in Brit.) 



Bulla trifasciata. Bui. testd ovato-suhglohosd, super ue 

 augustd, feuuiusculd, lavigatd, grised, maculis fuscis 

 Irrt'giilariljus parvis crebre aspersd, griseo-nigrescenti 

 splrttllter trifaaciatd ; mnbilico angusto, profunda, 

 api'rtnrii pgriformi ; lubro swpra medium spiraliler lor- 

 tiiu.so, oblique produclo, supra apicem, elevato. 



The thhke-banded Bulla. Shell ovate-subglobose, 

 narrow above, rather thin, smooth, grey, closely 

 s]n'inkled with brown irregular small spots, with 

 three blackish-grey spii'al bands ; umbilicus narrow, 

 deep, aperture pyriform ; outer lip spirally tortuous 

 above the centre, obliquclv produced, elevated above 

 the apex. 



SOWEKUV. 



Hub. riiilippine Islands. 



The thinness of this siiell, the fineness of its marbled 

 marking, the dark spiral bands, the tapering of tiie upper 



end of the spiral curve of the upper part of the outer lip, 

 being uU constant characters, may appear suftieient to 

 justify the separation of this species from Bulla ampulln. 



Spe 



3. (F,g. a. 



Mu 



in Brit.) 



Bulla cruentata. Bui. testa ovato-subpijriformi, supm 

 medium caarctata, solidd, iremgatd, rubrd, maculis 

 mngnis fumo-rubesceutibus puuctis tiigrescentibu.s vii- 

 riegatd ; aperturd magnd, pallidd rubescenti, infra 

 expausd ; labro rosacea, supra apicem elevato, rotun- 

 dato ; labia alba, iucrassato ; columelld crassd, laid, 

 arcuafd ; timbilico apicali latiunculo. 

 The blood-stained Bulla. Shell ovate-subpyriforui, 

 narrowed above the centre, solid, smooth, red, varie- 

 gated with large red-brown patches and blackish 

 spots ; aperture large, pale reddish, expanded at the 

 lower part ; outer lip rose-coloured, raised above the 

 apex, rounded ; inner lip white, thickened ; columella 

 thick, broad, arched ; apical lunbilicus rather wide. 

 Arthur Adams, Sowerby's Thesaurus, Bulla, sp. .51. 



fig. 75. 

 Hab. Moluccas. 



Besides the dift'erence in general colouring and the rose- 

 bordering of the outer lip, there is a dift'erence in stiape 

 between this species and Bulla ampulla, the former Ijcing 

 more compressed above the centre. 



Species 3. (Tig. a, b, Mus. Cuming in Brit.) 



Bulla ampulla. Bui. tesid avato-ventricusd, solidd, hc- 

 rigrdd, albido-grisescenli, grisea fuscoque varii uugu- 

 lalim miinuvralu ; umhilico apicali lata; aperturd 

 lata, antiei latissimd ; lahro supra apicem elevato, ob- 

 liqun ; labia solido ; cDlumelld crassd, oblique arcuuld. 



The bottle Bulla. Shell oval-vent ricose, solid, smooth, 

 greyish-white, variously angularly marbled with grey 

 and brown; apical umbilicus wide; aperture wide, 

 anteriorly very wide ; outer lip raised above the apex, 

 oblique; inner lip solid; columella thick, oblicpiely 

 arched. 



LlNN.EUS, Systcnia Xaturie. 



Hab. Philippine Islaiuls. 



In most specimens the upper end cif the shell is only a 



little less rounded and broad than Ihr \u\\n. 



