BULLA. 



Species 4. (Fig. a, b, j\Ins. Cuming in Brit.) 

 BuLL.i TENUISSIM.\. Bill, lestd orato-olloiiya, subcijlhi- 

 dracea, subpelliicidd, temdsumd, pallidi fused, macii- 

 Uh subqiiadraiis, obscure f/iscis, preecipiie in fasciis 

 (jnaiuor disposifis variegatd, umbUico lato, apvrtwrai 

 iiiargine rectiuscitlo, maryine columeUari albo, plaiialo, 

 (ircuaio, angusto. 

 The very thin Bulla. Shell ovate-oblong, snbeylin- 

 drical, subpellucid, very tliiii, pale brown, variegated 

 with subquacb'ate, dull-brown spots, principally ar- 

 rayed in fonr rows, umbilicus wide, margin of the 

 apertnre rather straight, columellar margin white, flat, 

 arched, narmw. 

 SOWERBY. 



ILib. Swan River, Australia. 



Remarkable for the thinness of its half-transparent tex- 



Species 5. (Fig. a, h, Mus. Cuming in Brit.) 

 }5uLL.v ovULA. Bill, (estd solidd, ovato-subcylindraced, 

 postice siibanijiislatd, termino truncato, aiitice siibiu- 

 Jlatd, termino ntimdo, spiraliter griseo trifusclatd, 

 punctis id macuUs riibris variegatd, iiitns albd, aper- 

 turd poslice coarctatd, aiiiice lata, labia crasso, arcii- 



.slightly swollen, with end rounded, with three spiral 

 grey bands, variegated with red dots and spots, 

 white within, aperture narrowed posteriorly, wide in 

 front, inner lip thick, arehetl. 



Gould, ? 



Ilab. ? 



[he EOT, Bulla. 

 riorlv rather 



Shell solid, ovate-subcylindrieal, poste- 

 larrow, with end truncated, anteriorly 



Species <;. (Fig. a, A, r, iMus. Cuming ni Brit.) 



Bulla xehulosa. />'«/. Ii-xtii ovato-sitbghbosd, injlatd, 

 hemgatd, tiniiin'-^.'nl., _ c, s/'.s xpiram paulo nngustatd, 

 ciiiered vd r:iii,.\r, uh, nmriiUs gnttatis albo-cinereis 

 aiigidaitiii disp,iM/is jur/d, iii/lis pii//ide cinered, ma- 

 ciilis iiebiiliild. iiiiihilico spindi mitjiisto, aperturd pus- 

 lice I'hvaid, tdbri) urciinto, uiiUiy i.vpamu, labio super 

 aiifracliis e.rpaiiso, coliuiielld spirali latissiiiid. 



The cloudy Bulla. Shell ovate-subglobosc, inflated, 

 smooth, rather thin, a little narrowed towards the 

 spine, ash- or reddish-painted, with tear-like ash and 

 white spots angularly disposed, pale ash within, 

 clouded with spots, spiral umbilicus narrow, aper- 

 ture posteriorly elevated, outer lip arched, anteriorly 

 ex])anded, inner lip spread upon the whorl, spiral 

 columella very wide. 



Gould, United States' Survey Expedition. 



Huh. Guaymas, Gulf of California. 



A lighter and more globose shell than Bidlu nwpuUu. 



January, 18GS. 



