OXYSTYLA, MEXICO, ETC. 119 



The above description, comparisons and figure, from Shuttleworth, 

 contain all the definite information available on this species, the type 

 of which is in Shuttleworth's collection in Berne. The name was 

 adopted from Beck, who simply enumerates 0. livens among the spe- 

 cies without any reference or description, and consequently it had no 

 standing before 1856. According to Morch (Malak. Bl. xii, 39, 

 1865). Beck's type was a rather solid, very obsoletely keeled, white 

 shell, like Ferussac's pi. 115, fig. 2 possibly an albino form of 0. 

 longa ; but this fact has only antiquarian interest. The forms re- 

 ferred to livens by Crosse & Fischer and Strebel seem to me different, 

 and probably members of the 0. longa mutation-series. See 0. longa 

 var. uhdeana. 

 O. FERUSSACI (von Martens). PL 17, figs. 13, 14, 15, 16, 17. 



Shell ovate conic, rather solid, lightly striatulate, somewhat plicate 

 at the sutures, sculptured with very fine and close undulating and 

 frequently interrupted spiral lines ; white, with rather close purple- 

 brown streaks, generally simple and straight, rarely zigzagged or 

 forking and narrow, a few spiral bands, sometimes obsolete. Spire 

 conic, uniform white above, the apex with a minute brown spot, 

 whorls 6, nearly fiat, the last moderately swollen. Aperture rather 

 oblique, half the length of the shell, oval, acute above, white inside 

 and showing the streaks; columella straightened, thin, white; peri- 

 stome unexpanded, acute, narrowly brown edged ; parietal callus of a 

 more or less intense brown. Alt. 65, diam. 33, length of aperture 

 31, width 17 mill. (Martens.} 



S. W. Mexico : Tehuantepec, on a species of Taberiuemontana, be- 

 longing to the family Apocyneas (type locality; Deppe). Yucatan : 

 Shkolak (Heilprin). N. Guatemala : Panzos, in the Polochic valley 

 (Conradt), Vera Paz (Stoll). Central Guatemala: San Geronirno 

 (Champion) ; Zacapa, on a species of Cereus, in the treeless region 

 (Stoll). Nicaragua: Acoyapa (Belt). Costa Rica: Guanacaste 

 (Pittier) Salinas Bay (A. Alfaro). 



CocJdea vesicaria fluviatilis exotica, fyc., SEE A, Thesaurus, iii, pi. 



39, f. 54, 55 (1761) Zebra mulleri CHEMNITZ, Conch. Cab. ix, 2, 



p. 24, pi. 118, f. 1015, 1016 (1786). Helix undata FERUSSAC, Hist. 

 Nat. Moll. Terr, et Fluv. t. 115, f. 1, 4 (living animal) ; Tabl. Syst., 

 p. 48, no. 337 (part). Bidimus undatus (Brug.), PFR, in Martini & 

 Chemnitz, Syst. Conch. -Cab., ed. 2, Bidimus, p. 7 (part) pi. 2, 

 fig. 5 (copy from Chemnitz) Orthalicus ferussad, v. MART, in 



