OXYSTYLA, ANTILLES. 105 



1 would therefore uphold the decision of Dr. von Martens (Malak. 

 Blatter xii, p. 44, 1865), that the name zebra be wholly given up. 

 The data are too indefinite to permit us to fix upon any of the modern 

 species as the true zebra of Mu'ller, either by the process of elimina- 

 tion or otherwise. 



It should be mentioned that Messrs. Crosse & Fischer, not recog- 

 nizing the right of Bruguiere to dismember a composite species, have 

 arrived at the conclusion that the name zebra was " avec une certi- 

 tude presque complete " based upon the Antillean form, and should 

 replace that of undatus. Their remarks on the subject are worthy of 

 careful consideration, in which, however, the "presque" should re- 

 ceive due attention. 



Agatina variegata Rafinesque, Enumeration and Account of some 

 remarkable Natural Objects, etc., p. 3 (1831), Binney & Tryon's 

 reprint, p. 68, is an unidentifiable species of Oxystyla. 



Zebra loxensis Miller = Strophocheilus hartivegi Pfr., vol. x, p. 52. 



Antillean Species. 

 O. UNDATA (Bruguiere). PI. 27, figs. 16-26. 



Shell ovate-conic, varying from ventricose to elongate, rather solid 

 and strong, wholly denuded of cuticle or with it thin and inconspicu- 

 ous ; white or brownish, with numerous ii regular undulating longi- 

 tudinal stripes, often forked above, and three frequently-interrupted 

 spiral bands, often indistinct ; apex white or brown-tipped. Surface 

 with irregular growth-wrinkles, more or less puckered or plicatulate 

 below the suture, but showing no spiral striation on the last whorl, or 

 only the faintest indication of it in places. Whorls 6J to nearly 7, 

 moderately convex. 



Aperture ovate, white with bluish or brown dark markings inside, 

 oblique ; peristome thin, narrowly edged with brown ; columella 

 oblique or subvertical, white, the parietal callus varying from dark 

 chestnut to very pale. 



Antilles, Southern Florida. 



A species of peculiar distribution, closely allied to 0. maracaibensis 

 Pfr., and distinguished from allied Mexican forms chiefly by the 

 obsolescence of the spiral striation. Several well-marked geographic 

 races are indicated by the extensive series of specimens examined, as 

 follows : 



