HELICINA.— Plate XIX. 



lariter rugata ; eolumelld olliqua, angustd ; lahio 



externo tenui. 

 The invested Helicina. Shell globose, minute, pale, 



horny, covered with a very thin epidermis, 



obliquely regularly wrinkled ; columella oblique, 



narrow ; outer lip thin. 

 GuiLDiNG. Sowerby, Thes. Conch., first monograph, 



f. 42. 

 Hab. N. Ar 



Species 168. (Mus. Brit.) 



Helicina hnicarinata. Ilel. testa mimitd, e/lohoso- 

 subacuminatd, lineis punclisque griseis variegatd ; 

 spird conicd, ultimo anfractu medio angulato, 

 carinato, apertiird parvd ; eolumelld iemii, labia 

 externo vix rejlexo. 



The one-keeled Helicina. Shell minute, globose, 

 subacuminated, variegated with lines and spots of 

 grey ; spire conical, last whorl angular in the 

 middle, keeled, aperture small ; columella thin, 

 outer lip scarcely reflected. 



SowERBT. Thes. Conch., Helicina, 2nd monog. sp. 107. 



Hab. ? 



Species 1G9. (Mus. Brit.) 



Helicina rhdis. Hel. testa parvd, globoso-trochiformi, 

 subrugatd, rubra, griseo variegatd ; spird elevatd, 

 conicd ; ultimo anfractu medio vix angulato, 

 ap)erturd productd, labio externo vix incrassaio. 



The rough Helicina. Shell small, globose-trochi- 

 form, a little roughened, red varied with grey ; 

 spire elevated, conical ; last whorl scarcely angular 

 in the middle ; aperture produced, outer lip 

 scarcely thickened. 



Pfeiffer. Proc. Zool., 1855. 



Hab. Sydney. 



Species 170. (Mus. Brit.) 



Helicina inconspicua. Hel. testd jmrvd, subviridi, 



corned, subtrochiformi ; spird parvd, acuminata, 



idtimo anfractu lato, compresso. 

 The inconspicuous Helicina. Shell small, greenish, 



horny, rather trochiform ; spire small, acuminated, 



last whorl broad, compressed. 



Pfeiffer. ? MS. in Cuming's collection. 



Hab. .' 



Species 171. (Fig. a, b, Mus. Brit.) 



Helicina cornea. Hel. testd minutd, subcompressd, 

 nigrescenti ; spird conicd, depressd, apice aciiminaio, 

 idtimo anfractu depresso, medio subangulato ; 

 aperturd siibangulatd ; callo ventrali rotunda, 

 rubro marginato. 



The horny Helicina. Shell minute, rather com- 

 pressed, blackish ; spire conical, depressed, apex 

 acuminated, last whorl depressed, a little angular 

 in the middle ; aperture a little angular ; ventral 

 callus rounded, pink-edged. 



Sowerby. Thes. Conch., 2nd monograph, sp. 186, 187. 



Hab. ? 



Species 172. (Mus. Brit.) 



Helicina multicolor. Hel. testd minutd, subdepressd, 

 Buhangulatd, fulvd, stiprd medium rosea variegatd, 

 spird depresso-conicd ; aperturd angulatd, labio 

 externa tenui ; eolumelld alba, subtrigond parvd. 



The many-coloured Helicina. Shell minute, sub- 

 depressed, subangular, fulvous variegated with 

 pink, spire depressed-conical ; aperture angular, 

 outer lip thin ; columella white, subtrigonal, small. 



Gould. Proc. Boston Soc. 



Hab. Tahiti. 



