1 88 BULIMULUS-BOSTRYX-LISSOACME. 



brown), spire reddish or corneous-brown ; sculptured with incon- 

 spicuous growth-wrinkles. Spire conic, apex smooth ; whorls 6, 

 convex. 



Aperture ovate, over half the length of shell, colored within like 

 the outside. Outer lip thin, sharp, regularly arcuate ; columellar 

 lip dilated above and reflexed over, closing or nearly closing the per- 

 foration. 



Alt. 28, diam. 18 mill. (Orb.'). 



Alt. 22, diam. 13 ; alt. of aperture 12* mill. (Specimen). 



Alt. 23, diam. 13 ; alt. of aperture 12 mill. (Specimen). 



Argentina, provinces of Santa Fe, Entre-Rios, Cordoba, S. Luis 

 Catamarca, Tucuman, Salta, etc.; Bolivia, Santa Cruz de la Sierra 

 (Bridges) and Llanos de Chiquitos (Orb.). 



Helix apodemetes ORB., Mag. de Zool., 1835, p. 10. Bulinus apo- 

 demetes SOWB., Conch. Illustr., f. 64, 64*. Bulimus apodemetes 

 ORB., Voy. dans 1'Amer. Merid., p. 279, pi. 30, f. 5-8. KEEVE, 

 Conch. Icon., f. 142 (bad). PFR., Monogr.,ii,p.l73 ; viii, p. 160. 

 itiDALGo, Viaje al Pacif., MoL, p. 85. PARAVICINI, Boll. Mus. 

 Zool. ed Anat. Comp. R. Univ. Torino, ix, no. 181, p. 6 (1894). 

 Bulimulus apodemetes BECK, Index, p. 68. STROBEL, Mater. 

 Malac. Argentinia, p. 26. DOERING, Bol. Acad. Nac. Ciencias Rep. 

 Argent. (Cordoba), iii, p. 68 (1879). Bulimus pessulatus REEVE, 

 Conch. Icon., pi. 23, f. 153 (June, 1848). PFR., Monogr., iii, p. 409. 

 Plectostylus pessulatus FFLD., Verh. Zool.-bot. Ges. Wien, xix, p. 

 875, 1869. 



The inflated form, thin, light texture and conspicuous striping 

 render this an easily recognized form. In some places, such as 

 Cordoba de Tucuman, specimens occur without the chestnut stripes. 

 Doering has shown the jaw and teeth to be of the usual type in 

 Bulimulus. It is a widely distributed species. I fail to see any 

 differential characters, whatever, in Reeve's B. pessulatus t collected 

 by Bridges in Bolivia (fig. 4). 



B. CENTRALIS Doering. 



Shell perforated, ovate-conic, thin, rather smooth, slightly shin- 

 ing; opaque whitish, more or less variegated with very irregular 

 pellucid corneous streaks. Spire oblong-conic, the apex corneous- 

 buff. Whorls 6, a little convex, the last about one-half the total 

 length, not descending. Columella subplicatulate. Aperture oblong- 

 ovate ; peristome simple, acute, the right margin reflexed, half clos- 



