STROPHOCHEILUS-BORUS. 15 



whorls, large size and equal rounding out of the outer lip of this 

 species. Cuticle lighter brown-yellow, and lost in large tracts or 

 streaks. Coluraellar margin closely appressed, callous tubercle 

 strongly developed. 



Length 141, diam. 89 ; apert., length 81, width 57 (40 inside). 



Length 134, diam. 81 ; apert., length 71, width 51 (39 inside). 



Length 131, diam. 78; apert., length 72, width 51 J (40 inside). 

 Upper course of the Magdalena jR., New Granada. 



S. MAXIM us Sowerby. PI. 4, fig. 5. 



Shell elongated, the last whorl narrowed above, swollen sack-like 

 below; suture constricting. Brownish-yellow with dark streaks. 

 Aperture slightly less than half the shell's length ; columella sub- 

 vertical^ broadly expanded and appressed at the umbilical region, 

 and meeting the parietal wall at a smaller angle (135) than in S. 

 popelairianus. 



Alt. 130, diam. 67 ; alt. aperture 64 mill. 



Alt. 135, diam. 73; alt. aperture 63 mill. 



Bolivia, at the foot of the eastern Cordillera at Sta. Rosa, near Santa 

 Cruz della Sierra, and in the country of the tribe Yuracares in humid 

 forests (Orbigny) ; On the Rio Tocantins, in the neighborhood of 

 Baiao, N.-E. Brazil (Stiibel). 



Cochlogena maxima SOWERBY, appendix Tankerv. Catal. p. vii, 

 (1825, unrecognizable description). Bulinus maximus SOWB., Con- 

 chol. Illustr., f. 63 (1841 ?). B ulimus maximus RVE., Conch. Icon, v, 

 pi. 51, f. 337 (1848). PFR., Monogr. ii, p. 19. MARTENS, Novit. 

 Conch, v, p. 4 ; Conch. Mittheil. i, p. 157. Bulimus kremnoicus. 

 d'ORB., Voy. dans 1'Amer. Merid. p. 300, pi. 35, f. 1, 2, and var. f. 3. 

 Helix kremnoica d'ORB., Syn. p. 15. (Not B. maximus BLD. in 

 C. B. Ad. Contrib. Conch, no. 11, p. 229,=.B. popelairianus var. 

 thammianus) . 



This rare species has the sharp, close riblets of earlier whorls, and 

 the dense granulation of those following, as in S. popelairianus; but 

 it is apparently quite distinct in the smaller angle made by columella 

 with parietal wall, and the much broader spread of the reflexed col- 

 umella upon the adjacent umbilical tract of body-whorl. It is also 

 rather more elongate with smaller mouth ; and there seems to be no 

 callous nodule upon the upper part of parietal wall, such as occurs 

 in S. popelairianus. 



