498 TEST ACE A ATLANTIC A. 



mela de Porto Santo ; mais elle est un peu plus deprimee, avec 

 un tour et demi de moins ; le dernier est, en meme temps, plus 

 dilate. On remarque, a la surface du test, une costulation 

 blanchatre, fine, serree, reguliere, et, en outre, des vestiges de 

 marbrure qui le temps n'a pas completernent effaces. L'angle 

 peripherial, d'abord assez prononce, s'attenue graduellement en 

 approchant de 1'ouverture.' [I. c. 237] 



Helix subroseotincta, n. sp. 



T. imperforata, depresso-globosa, vix subcarinulata, nitidius- 

 cula, albidiuscula (interdum subfusco- aut etiam obsoletissime 

 subroseo-tincta), obsolete et irregulariter (prsecipue versus su- 

 turam) subiacteo-liturata, jun. subpellucida ; anfractibus 5 con- 

 vexiusculis, sutura distincta, ultimo antice paulo descendente ; 

 aperturae labris disjunctis; peristomate acuto, distinctius roseo; 

 columella oblique subrecta, cum labro angulum sub-efformante. 

 Diam. maj. 5-6 ; alt. 4 Un. 



Habitat Brava ; in montibus excelsioribus supra Povoacao, 

 plantis Euphorbice Tuckeyance, Webb, adhserens, Martio 28, 

 1864, a Revdo, R. T. Lowe copiose deprehensa. 



Although larger, more opake, and of a more chalky-white 

 hue with an obsolete rosy tinge (much as we see in some of the 

 pallid varieties of the H. pisana), this Helix has something 

 about it, at any rate when not fully mature, which recals the 

 Madeiran H. membranacea, Lowe ; and although perhaps, in 

 reality, more on the erubescens type, we may be permitted to 

 regard it as the Cape-Verde representative of that species, 

 looking on the H. Bollei, leptostyla, and advena as the ana- 

 logues of the latter. 



The H. subroseotincta, in its small size and totally un- 

 granulated surface, has more in common with the H. Bollei 

 than it has with the leptostyla; nevertheless it is thicker, 

 whiter, and more calcareous; its peristome has nearly always a 

 faint rosy tinge (indeed the entire shell is often suffused with 

 an obscure pinkish brown) ; its volutions (the basal one of 

 which is not quite so perceptibly keeled) are a trifle more 

 tumid, and the suture consequently somewhat more impressed ; 

 its columella is just appreciably straighter, forming somewhat 

 of an angle at its junction with the lower lip ; and its entire 

 surface has a tendency to be irregularly blotched, or freckled, 

 with very obscure, paler, frequently confluent patches, which, 

 although now and then absent (and never condensed into 

 fasciae), are at times quite conspicuous. 



The present Helix was found abundantly by Mr. Lowe (on 

 March the 28th, 1864) on the mountains above the Povoacao 



