HELIX.— Plate C. 



fumi, slriatd, Uneii concentrica con/eriimmis tuli- 

 tUUsimi: granulato-decuuatu ; anfractibui quinque, ul- 

 timo aniici convexo, ad apcrturam exlits scrobiculalo ; 

 aperluru liorizonlali, auriformi ; peristomaie reflexo, 

 ad carinam suicarialiculalo, marginibm lamina ele- 

 vatd, lamellam elongalam inlraiilem emiltente, junctit, 

 columellari breviler arcuato, bnsali bideiitalo, deiile al- 

 tera lalo, breoi, obtmo, altera majore, sidcata. 



The plicated Helix. Shell umbilicated, orbicular, 

 shaqjly keeled, convex on both sides, rather solid, 

 chestnnt or brown, striated, verj' finely grauulately 

 decussated with close-set concentric lines; whorls 

 five, the last convex in front, furrowed without 

 the aperture ; apertiu'e horizontal, car-shaped ; lip 

 reflected, slightly channelled at the keel, margins 

 joined by a raised lamella, emitting an entering 

 elongate lamella, columellar margin shortly arched, 

 basal margin two-toothed, one tooth broad and short, 

 the other larger and grooved. 



Born, Test. Mus. Vindoboneusis, p. 368. 

 Carocolla Hi/adina, Lea. 



llah. Central America. 



This diHurs little from //. labyrinthus, except in being 

 of larger and more solid growth, and more callous about 

 the aperture. 



Species 554. (ilus. Cuming.) 

 Helix hifurcata. Eel. testa umbilicatd, depressd, 

 arbiculari, leviler slriatd, fulvd, suhtus pallida, vel 

 medio tanlum pallida ciiigidald ; anfruclibus quinque, 

 planulatis, ultimo obsolete carinato, antici subitu de- 

 Jiexo ; aperturd depressd, transverse pyrifarmi, lamina 

 elongatu, compressd, erecld, inlrante coarctuld ; peri- 

 stomaie albido, rejlfxo, marginibus callo praminente 

 junctis, basali dentibus duobus, altera depresse triangu- 

 lari, altera bifurcata, inslructo. 

 The bifukc.vte Helix. Shell umbilicated, depressed, 

 orbicular, slightly striated, fulvous, pale beneath, or 

 encircled with a pale band only round the middle ; 

 whorls five, rather flat, the last obsoletely keeled, 



suddenly deflected in front ; aperture depressed, 

 transversely pear-shaped, contracted by an elongate, 

 compressed, erect, entering lamella ; lip white, re- 

 flected, margins joined by a prominent callosity, basal 

 margin furnished with two teeth, one of which i» 

 depressly triangular, the other bifurcate. 



Deshayes, Guerin's Mag. de Zool. pi. 111. f. 2. 



II(dt. (iuyana. 



The bifurcate tooth is very solid and callous at the l)ase 

 and most conspicuously developed. 



Species 555. (Mus. Cuming.) 



Helix ankuufera. Ilel. testa vmbilicatd, depressa, ten- 

 ticnlari, minute granulatd, rufa-caslaned, ad periplie- 

 riam alba; an/ractibus quinque, plano-convexis, ultimo 

 ad aperturam biscrabiculato, antice dejleia ; aperturd 

 harizontali, auriformi; peristomate incrassato, albo, 

 elevata, ad carinam peculiariter retrorsum sinuato, 

 marginibus integris, l/imellam intrantem pariete emit- 

 tenlibus, basali denlnla, deinde excavata, dente trian- 

 gulari lamelliformi inslructo, dentibus lamellisque albis. 



The kinged Helix. Shell umbilicated, depressed, lens- 

 shaped, minutely granulated, reddish-chestnut, white 

 at the periphery ; whorls five, flatly convex, the Inst 

 two-fuiTowed at the aperture, deflected anteriorly ; 

 aperture horizontal, car-shaped ; lip thickened, white, 

 raised, peculiarly sinuated backwards at the kwl, 

 margins entire, emitting an entering lamella on the 

 wall of the body -whorl, basal margin toothed, then 

 excavated, and furnished with a triangular lamelli- 

 form tooth, teeth and lamella! white. 



Peeiffeu, Pro. Zool. Soc. 1851. 



nab. Central America. 



The aperture of this species is characterized in a man- 

 ner (not sutficicntly shown in the accompanying figure) 

 which is quite peculiar, being sinuated at the keel so as 

 to form a spouted channel on the upper surface of the 



