BULIMULUS-PLECTOSTYLUS. 



are longitudinally streaked with the same color, or irregularly 

 clouded ; while many specimens are clear yellowish or light brown, 

 usually showing narrow spirals of a darker tint. There is no other 

 species very nearly allied to this. 



B. peruvianus is said to be viviparous. The name is unfortunate, 

 as the species is not known to occur in Peru. 



B. CHILENSIS (Lesson). PI. 7, figs. 8, 9, 10. 



Shell imperforate, ovate-oblong, thin but rather strong, buff or 

 pale chestnut, with narrow longitudinal streaks of brown. Surface 

 ivith dense and fine irregular strice, cut into fine granules throughout. 

 Spire short, conic, rather acute; sutures minutely denticulate. 

 Whorls 5?, slightly convex, the last oblong. 



Aperture about half the total length, acuminate-ovate, white or 

 streaked inside ; peristome acute, unexpanded ; columella with a 

 weakly convex entering fold above, the columellar margin reflexed 

 and appressed ; parietal callus thin and transparent. 



Alt. 42, diam. 21 mill. ; aperture 22 mill. long. 



Alt. 38-, diam. 18 mill. ; aperture 20 mill. long. 



Form aldunatea Hupe (pi. 7, figs. 6, 7). Shell with three dis- 

 tinct spiral bands of brown. 



Chili, from Concepcion (Cuming, Orb., Gay) ; to Valparaiso 

 (Cuming, Orb., Paz, Martinez). 



Bidimus chilensis LESSON, Voy. de la 'Coquille,' Zool., Atlas, 

 Moll., pi. 7, f. 3 (1826). Not Bulinus chilensis Sowb., 1833, see 

 Vol. X, p. 34. Achatina chiliensis LESSON, Voy. de la ' Coquille,' 

 ii, pt. 1, p. 317 (1830). Bulimus chilensis DESH. in Lam., An. s. 

 Vert, viii, p. 264. ORB., Voy., p. 267. REEVE, Conch. Icon., pi. 

 17, f. 102. OLD., U. S. Expl. Exped. Moll., p. 79, pi. 6, f. 81. 

 HUPE in GAY, Hist, de Chile, viii, p. 99, pi. 1, f. la-Id. PFR., 

 Monogr., ii, p. 167 ; iii, 406 ; iv, 466 ; vi, 105 ; viii, 142. HIDALGO, 

 Viaje al Pacif., p. 103. Plectostylus chilensis FFLD., Verh. Zool.- 

 bot. Ges. Wien, xix, 1869, p. 875. Bulimus (Plectostylus') chilensis 

 SEMPER, Reisen im Archipel Phil., Landmoll., iii, p. 153, pi. 15, f. 

 6; pi. 17, f. 12 (anatomy). Bulimus granulosus POT. & MICH., 

 Galerie, i, p. 142, pi. 13, f. 9, 10. Bulinus granulosus BROD., P. Z. 

 S., 1832, p. 31. SOWB., Couch. Illustr., f. 7, 7*. Bulimulus grani- 

 ger BECK, Index, p. 67. Helix (Bulimus) aldunatea HUPE in Gay, 

 Hist. Chile, viii, p. 100, pi. 1, f. 6 (as var. of chilensis). Partula 

 Jlavescens KING, Zool. Journ., v. p. 342, (1831). Bulimus flavescens 

 PFR., Monogr., ii, p. 75 (copy of orig. descr.). 



