INSULARUM MADERENSIUM 33 



Helix lentiginosa, Pfeif. Mon. helic. 

 » » Reev. Conch. (fig. bona) 



» » Alb. Mal. Mad. (fig. hona) 



Habitat copiose in insula Madura ad rupes marilimas prope vicos S. Jorge. 

 SJ" Anna, Ponla Delgada ad Sempervivorum folia, sub lapidibus in convalle Ri- 

 beira de S.'" Luzia, in promontório Garajáo, tara in insula Deserta Australi. 



Variet. adest x major inter S.'" Anna et S. Jorge liaud rara sub lapidibus. 



Obs. Ab H.-arcta Lowe, cui valde similis, umbilico arapliore, aperto, spi- 

 rali, testa fere membranacea, compressiore, majore, anfiactus ultimi basi rotun- 

 data, lamellis numerosis, subincurvis, pellucidis, radiatis, apertura ovato-rotun- 

 data nec depressa, peristomalis marginibus reflexis nec super basin protensis 

 distinguitur. 



Obs. H.-arridenti Lowe quodammodo affinis; ast peristomalis supra umbi- 

 licum partim producti conformatione differt imprimis. 



Species sic dieta quòd testa maculis lutescentibus variegata, quasi lenliginosa. 



Ab affinibus diversa ob testam maculatam, lentiginosam. 



Primus invenit clariss. Rev.'' Loweus. 



25. Helh arcta, Lowe 



Testa perforata, rotundato-depressa s. lenticularis, utrinque planiuscula, so- 

 lida, flavo-marraorata, rufo-niaculata, obsolele fasciata, rude crebreque costula- 

 to-striata; spira convexiuscula; sutura distincta; perforalio minima, punctiformis; 

 anfractus 4-4 V-2 planiusculi, ultimns carinatus, breviter antice deflexus; aper- 

 tura obliqua, lunato-circularis, dente oblique intrante, albo intus ad ventrem 

 coarctata; peristoma continuura, intus albo-callosum, marginibus subcontiguis. 

 — Animal inquietuni, audax, corpore oblongo, gracili, griseo, pellucido, tuber- 

 culis mínutissimis, fuscescentibus, rotundis totó adsperso, dorso linea longitudi- 

 naii notato, fronte albido, submamillato, superioribus tentaculis longis, cylindri- 

 cis, gracilibus, lividis, ápice oblongo-bulbosis, basi divergentibus, inferioribus 

 minute tuberculatis, lividis, pede rubello-lutescente, postice acutiusculo, antice 

 obtuso, pallio pulposo, punctulis albidis adsperso, oriflcio respiratório sphinctere 

 partim instructo. 



Diam. maj. 5, min. 4, alt. 2 mill. 



Helix arcta, Low. Prim. (fig. óptima); et Cat. moll. Mad. 

 » » Pfeif. Mon. helic. 

 » » Reev. Conch. (fig. indistincta) 

 » » Alb. Mal. Mad. (fig. quoad formam óptima) 



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