162 BULIMULUS-BOSTRYX-LISSOACME. 



several earlier whorls smooth, glossy and corneous. Whorls about 

 6J, quite convex, the sutures deep. 



Aperture less than half the total length, ovate, inside brownish or 

 showing the external markings. Outer lip thin, unexpanded ; col- 

 umella somewhat concave ; columellar lip dilated above, whitish or 

 brown. Parietal callus extremely thin. 



Alt. 20, diam. 1H mill. 



HuacJio and Lima, Peru, on hills under stones. 



Bulinus modestus BROD., P. Z. S., 1832, p. 106. SOWB., Conch. 

 111., f. 19. Bulimus modestus DH. in Lam., An. s. Vert., viii, p. 274. 

 REEVE, Conch. Icon., f. 109. PFR., Monogr., ii, p. 207 ; vi, p. 

 139 ; Conchy 1. Cab., p. 224, pi. 62, f. 3, 4. HIDALGO, Journ. Conch. 

 1870, p. 53. Bulinus striatulus Sow., P. Z. S., 1833, p. 73 ; Conch. 

 Illustr., f. 58. Bulimus striatulus DESH. in Lam., viii, p. 270 ; and 

 in Fer., Hist., p. 82, pi. 150, f. 24, 25. REEVE, Conch. Icon., f. 143a 

 (figure of Sowerby's type). Not Bulimus striatulus Lam. B. phil- 

 ippii PFR., Symbolse ii, p. 120 ; Monogr., ii, p. 208 ; vi, p. 139 ; Con- 

 chyl. Cab., p. 226, pi. 62, f. 9, 10. HIDALGO, Viaje al Pacif., p. 89 

 (includes striatulus and modestus). B. orbignyi PFR., P. Z. S., 1846, 

 p. 31 ; Monogr., ii, p. 208. Conf. REEVE, C. Icon., f. 143b, figure 

 of type. 



The prominent features of B. modestus are its rather turrited form, 

 and raised, thread-like striae, which are, however, often quite irreg- 

 ular in degree of development on different parts of the shell, and 

 vary from whitish to the tint of the ground-color. The dull, brown- 

 streaked coloring is also characteristic. In B. striatulus and orbi- 

 gnyi this is varied by spiral whitish bands ; but I quite agree with 

 Hidalgo that the several forms are specifically identical, the series 

 before me well connecting them. The banded form is from Lima 

 .(Cuming, Paz, Martinez and de Lattre). 



B. DELICATULUS Philippi. PI. 47, figs. 87, 88. 



Shell umbilicate-perforate, ovate-conic, very thin. Pale corneous, 

 ornamented with white, slightly raised, delicate folds, which in places 

 are confluent; whorls of spire having three or four ill-defined 

 corneous transverse lines. Whorls 6, a little convex, the last little 

 longer than the spire ; apex rather obtuse, very smooth ; suture 

 moderately deep. Aperture ovate ; columella a little straightened, 

 .the peristome unexpanded, thin, right margin arcuate, columellar 



