164 BULIMULUS-BOSTRYX-LISSOACME. 



B. JUANA Cousin. PL 1, fig. 9. 



Shell umbilicated, ovoid, and conic above; quite thick and dull; 

 ashy-white, with three small tawny-brown bands, one at the suture, 

 the others submedian ; surface ornamented with irregular growth- 

 striae which are quite spaced and projecting. Whorls 7, slowly and 

 regularly increasing, separated by an impressed suture ; two earlier 

 whorls smooth, and with the following two corneous-brown ; follow- 

 ing whorls of spire with two brown bands. Last whorl plainly car- 

 inated around the quite large and deep umbilicus. 



Aperture oval, interrupted by the preceding whorl; peristome 

 thin, sharp, the upper insertion a little above the lower band ; col- 

 umellar margin straight, with the traces of a canal at its union with 

 outer lip. Alt. 20-23, diam. 10-11 ; alt. of aperture 10, width 7 

 mill. 



Gualacco, province of Cuenca, Ecuador (Cousin). 



Thaumastus juana COUSIN, Bull. Soc. Zool. France, xii, p. 228, pi. 

 4, f. 10 (April 1, 1887). 



Description abridged from Cousin. 

 B. LAURENTII Sowerby. PL 50, figs. 47, 48, 49, 50. 



Shell umbilicated, ovate-pyramidal, thin ; whitish with (1) numer- 

 ous (about 6) spiral brown bands (continuous or broken into a tessel- 

 lation), or (2) brown with darker streaks and a few median and 

 basal white spirals, or (3) unicolored white. Surface hardly shin- 

 ing, smooth except for faint growth-wrinkles. Whorls 6, convex, 

 the apex smooth. 



Aperture ovate, less than half the length of shell, showing the 

 external coloring within. Outer lip thin ; columellar lip dilated 

 above. 



Alt. 15?, diam. 9; alt. of aperture 6? mill. 



Alt. 143, diarn. 8 ; alt. of aperture 6 mill. 



Island of San Lorenzo, Bay of Callao, Peru (Cuming and others) ; 

 Cero de las conchitas, near Lima (Paz). 



Bulinus laurentiiSovfB., P. Z. S., 1833, p. 37. Bulimus laurentii 

 PFR., Monogr., ii, p. 213 ; Conchyl. Cab., p. 231, pi. 62, f. 28-30. 

 DESH. in Fer., Hist., p. 86, pi. 157, f. 26-28. REEVE, Conch. Icon., 

 f. 119. HIDALGO, Journ. de Conch., 1870, p. 60 B. lorenzii ORB., 

 Voy,p. 281. POT. & MICH., Galerie, i, p. 146, pi. 13, f. 13, 14. 



With the form of B. modestus, this species lacks the coarse stria- 

 tion and is constantly much smaller. The color-patterns are numer- 

 ous. 



