376 MR. E. A. SMITH ON THE [Apr. 1«, 



several of his own iuteresting discoveries. The remaining portion 

 was obtained from the Rev. W. Deans Cowan, and was collected by 

 him in a more southern part of the island than that visited by Mr. 

 Johnson. It also contains several very interesting forms, notably 

 the species of Vitrina previously referred to, and the Bulimus 

 nigrilineatus of Reeve, l)elouging to a section {Rhachis) of that im- 

 mense group of laud-snails which was hitherto unknown in Mada- 

 gascar. 



A. GASTROPODA. 

 Cyclostoma macare^, var. 



Hab. Betsileo ( Coj/7an) . 



The typical form of this species, described by Petit, was originally 

 collected in the south part of Madagascar, near Saint Augustin. The 

 more northern variety from Betsileo is rather more coarsely sculp- 

 tured, and has a distinct peripherical black zone, and sometimes a 

 broader but less distinct one on the upper part of the last whorl. 



Cyclostoma betsileoense, sp. nov. (Plate XXI. fig. 2.) 



Shell umbilicated, turbinate-globose, thinnish, finely spirally Urate, 

 encircled with two more prominent white keels, one at the middle of 

 the body-whorl, and the other above, decussated by close lines of 

 growth ; cinereous (except the reddish spire), copiously striped longi- 

 tudinally with a brownish colour, with a few spiral purple-black 

 lines and zones, one just beneath the central white carina, broader 

 than the rest, and a rosy stripe outside the labrum. Whorls 5|, 

 separated by a narrowly channelled suture, which is beautifully 

 clathrated by the lines of growth. Two nuclear whorls smooth, con- 

 vex, forming an obtuse apex ; the rest convex, but appearing a little 

 angular at or a little above the middle, where the upper carina is 

 situated. The visible spiral threads are six in number on the ante- 

 penultimate whorl, about twelve on the penultimate (including the 

 two white keels), and nearly double the latter number upon the upper 

 half of the body- whorl, the lower part having as many as thirty-two 

 to thirty-five, those around the umbilicus being a trifie coarser than 

 the rest, the interstices being everywhere decussated by the lines of 

 growth. The spiral lineation is constant in three out of five examples, 

 is chiefly confined to the last whorl, and is most conspicuous within 

 the aperture when the shell is held up to the light. There are two 

 lines above the upper white keel, two between it and the lower one, 

 and about six beneath the latter, the uppermost being much broader 

 than the rest. Aperture subcircular, chestnut within, very dark 

 towards the outer lip, showing the external lines and bands, a little 

 higher than wide. Peristome acute, white on the columellar margin, 

 only narrowly reflexed, flatly and more widely expanded on the right 

 or outer margin, pink, except at the upper part towards the suture. 



Greatest diameter 25 millim., height 2.5. 



Hab. Betsileo {Cowan). 



In some respects C. pulchellum of Sowerby approaches this species. 



