HELIX.— Plate XCVI. 



Benson, Aim. mid Mag. Nat. Hist. 1850. vol. v. p. 215. 



Hdii viltala, Adams and Kecve (not of Miillcr). 

 Hab. Borneo. 



Of this fine species, collected in the Samarang, and 

 (igured with the animal in the Zoologj- of tlie voyage, spe- 

 cimens have since been received of a dark uniform browni 

 colour. For a figure of this variety see Plate LXXX. 

 Fig. 42(i. 



Species 627. (Mus. Deuaison.) 



Helix Mackensii. Hel. testa late umbilicatd, orbiculari- 

 depresad, olivaceo-cadaned ; spird convexd; anfractibus 

 sex ad septem, plauiuscutts, ultimo ad peripkeriam acute 

 carinato et setoso, infra rotuiidato ; umbilico amplo, 

 perspectivo ; aperturd parvd, lunato-circulari ; peristo- 

 male subiiicrassato, paululum reflexo, cameo, marginibus 

 callo cameo junctis. 



Mackensie's Helix. Shell broadly umbilicatcd, orbi- 

 cularly depressed, olive -chestnut ; spire convex ; 

 whorls six to seven, ratiier flat, the last sharply 

 keeled and bristled at the periphery, rounded be- 

 neath ; umbilicus large, perspective ; aperture small, 

 lunar-circular ; lip rather thickened, a little reflected, 

 tlesh-eoloured, margins joined by a flesh-coloured 

 callosity. 



Valenciennes, Voy. de la Bonite, pi. 25. f. 14. 

 Hab. Island of Ty-pin-san, Mciacoshima Group; Belcher. 

 The bristly hairs with which this shell is furnished at 

 the jieripherj', arc the most fully developed in immature- 

 specimens. 



Species 528. (Mus. Belcher.) 



Helix PLLHIZONaTA. JJel. testd obtecti umbilicatd, tub- 

 tjlobom, alba, maculis pallidi fuicis iiebutatd, ttrialo- 

 rugosd, fasciis plurimis spadiceii et purpuraicriiiHus 

 ciiictd : anfractibus ijuatuor, coiwexis, ultimo rotuii- 

 dato; aperturd lunato-circulari, iiitus fined ; peritto- 

 male late reflexo, albo, margitie inferiore subcallow. 



The many-zoned Helix. Shell with a partially covered 

 umbilicus, somewhat globose, white, clouded with 

 light brown spots, striately rugose, encircled with 

 numerous fawn aiul purplish bands ; whorls four, 

 convex, the last rounded ; aperture lunar-circular, 

 brown withiii ; lip broadly reflected, white, lower 

 margin rather callous. 



.\dams and Reeve, Zool. Voy. Samarang, p. G2. pi. 16. 

 f. 9. 



Hab. Island of Mindanao, Philippines ; Belcher. 



The alternate purple and fawn bands are doubtless pecu- 

 liar to the species, and among its chief characteristics. 



