HELIX— Plate XXIII 



SowEBBY, Pro. Zool. Soc. 1851, p. 40. 



Bull ■ />««, I'fiiffcr. 



Jla/i. hi. I III, riiili|ipiiie!i. 



This approacbca nearer to the ty|K' of Bulimy*, but it 

 was liardk iicccs-i.irj' to remove tlic species to that (jenus, 

 when it involved the iic«f«sit>' of altering the sjx'citic numc. 



Species lOU. (Mus. Cuming.) 



II El. I. \ Gabeuti. Net. tttld imperforata, coitoided, liiie'u 

 Miquit miHutiuime tubdecuuatd, pallidi JtaceKriite, 

 itrufit UHdatU el fiaiitmu fuKU pietd ; tulurd iin- 

 preud ; <i ■ '. ultimo baai aii- 



gulato ; I , . ', lupenie incras- 



Mtd ; aperturd SHbhorizontali, lunalo'tUiplicd ; peri- 

 tlomaU lati expaiuo, al&o, maryitiHut approjriiiialin. 



(iabkrt's IIf.U.X. Shell imperforated, conoid, wry mi- 

 nutely decussated with obli(|ue lines, pnlc yellowish, 

 jMiinted with brown waved streaks and flames ; suture 

 impn-ssi (t ; whorU six, rather flat, the la<t angled at 

 the base ; columella oblique, dilated, thickened at 

 the upper part ; aperture nearly hori/.ontal, lunar- 

 cUipticnl ; lip broadly expanded, white, margins 

 approximated. 



l,i;.ssoN, Yoy. de la Coquillc, vol. ii. p. 311. 

 Jletix trocMut, Quoy and Gaimard. 

 Iletiz troclniides, I^aniarck. 



I/ak. NcwCiuinrii; Quoy. 



I'his has completely the form of a TrocAus, and is cha- 

 ractcri7.e<l by broad closely painted zigzag streaks of 

 ni»t-brown. 



S]>ccics 101. (Mus. Cuming.) 



Helix comfokmis. Ilel. lettd imprr/orald, orbiculalo- 

 roiioided, Ittrigatd, albido-futcesrenle, faKiit fiutcix 

 lufpf arliculati* orH/itd ; lutiird profuiirld : aii/rnctiiii.i 

 qtiini/ue, contfxii, ultimo baai planiuiculo, anlid de- 

 frudeHle ; aperturd perobliqud, viagtid, ocali ; peri- 

 tlomate nlbo, tenui, lute expaiuo, margiuibut coiimveu- 

 tibu*, 6atali rejlexo, columellari dilatalo, oppreuo. 



Toe cone-shaped Helix. Shell imperforated, orbicu- 

 larly eonoidal, smooth, whitish-lirown, ornamented 

 with brown bands which aa- often articulated ; suture 

 dctp ; whorls five, convex, the last rather flattcnwl 

 at the ba.se, descending in front ; aperture very ob- 

 liciuc. large, oval ; lip white, tliin, broadly expanded, 

 iniirpu^ drawn inwardly, basal margin reflected, 

 columillar dilated, appn-ss»'d. 



Feecssac, Hist. Moll. pi. 108. f. 1. 

 Ifelix turl/iiiata, Pcshaycs. 

 JJelix Tiiffetii, Lesson. 



Jlab. New Ireland. 



This a])pTOaelifs very closely to the preceding species ; 

 it is chiefly characterized by the whorls being rounder 

 and forming a dceiicr suture. 



Species 102. (Mus. Cuming.) 



Hlli.v l)l"MONTI. Uel. tetld imperforata, coniformi, 

 apice oblutiuscula, aUiidd ; anfractibu^ quinque, lalit, 

 coiieexluscii/ii, ultimo basi subplaiiulalo, ad peripheriam 

 lined nigricante cinclo ; columella iutrante, obliqud, 

 dilalatd ; aperturd perobliqud, luimto-ovali ; peristo- 

 mate simplici, breviter expaiuo, margiiie supero an- 

 frorsum urcuoto, banati subrejhxo. 



Dimont's Helix. Shell imperforated, cone-shaped, 

 nithcr obtuse at the api-x, whitish; whorls five, 

 broad, rather convex, the last rather flattened at the 

 base, encircled with a sinirle black line at the peri- 

 phery ; columella entering, oblique, ililated ; aper- 

 ture verj' oblique, lunar-oval ; lip simple, shortly 

 expanded, upper margin arched in front, basal 

 margin slightly reflected. 



Pfeiffer, Philippi, Abbild. und Besch. Conch. Helix, 

 pi. 7. p. f^. 



ilab. Island of Mindoro, Philippines ; Cuming. 



The black line which encircles tliis shell is covered by 

 the whorls, in their convolution, at the suture, wliich is 

 of an opake white. It is not a line of colouring matter, 

 but n line of deciduous epidermis deposited in a narrow 

 groove. 



