BULIMULUS-SOUTH AMERICAN. 71 



Apparently allied to B. sporadicus and B. vesicalis, especially to 

 the stouter variety of the latter species ; but conspicuously different 

 in the very short spire, globose form and widely open, deeply pene- 

 trating umbilicus. By an inadvertent exchange of labels, a wrong 

 locality was given in the catalogue of Dr. Rush's shell in the 

 Nautilus. 



B. MENDOZANUS Strobel. PI. 11, figs. 22, 23. 



Shell covered-perforate, oblong, thin, the spire elongate, apex 

 obtuse; suture impressed. Whorls 4-5, somewhat convex, rapidly 

 increasing, the first very delicately longitudinally striated, shining, 

 roseate-buff, the rest longitudinally subrugose, somewhat shining, 

 buff with longitudinal corneous rays, the last not descending, slightly 

 exceeding half the shell's length. 



Aperture oblique, oval, peristome simple, acute, the margins 

 joined by a very thin parietal .callus ; outer margin unexpanded, the 

 columellar thin, a little expanded above, half closing the perfora- 

 tion ; throat whitish-rose. Alt. 20-24, diam. 10-12 ; aperture, length 

 11-13, width 7-8 mill. (&). 



Villa Vicencio, Sierra de Mendoza, Argentina (Strobel). 



Bulimulus(Eudioptus)mendozanus STROB., Mater. Malac. Argent., 

 p. 23, pi. 1, f. 4 (1874). DOERING, Bol. Acad. Nac. Cieu., iii, p. 70. 

 B. (Mormus) mendozanus MARTENS, Jahrb. D. M. Ges., ii, 1875, 

 p. 270. 



It differs from B. pseudosuccinea Moric. in the perforation of the 

 shell, more convex and less numerous whorls, and more obtuse spire 

 (Strobel). Doering believes it allied to B. monticola and B. tortor- 

 anus ; while von Martens refers the species to s. g. Mormus. 



B. FOURMIERSI (d'Orbigny). PI. 11, figs. 26, 27, 28. 



Shell short, rather ventricose, subumbilicate ; thin, diaphanous 

 and smooth ; uniform gray-brown. Spire conic, short, the apex 

 obtuse ; whorls 5, convex, swollen, separated by deep sutures. 

 Aperture oval, the peristome thin and sharp ; columella very nar- 

 row. Alt. 11, diam. 7 mill. (Orb.*). 



Prov. Corrientes, Argentina, near Rio de Santa Lucia, at a place 

 called Pasto reito, in a clump of trees in the plains (Orb.). 



Bulimus fourmiersi D'ORB., Voy., p. 273, pi. 30, f. 12-14. PFR., 

 Monogr., ii, p. 196. Thaumastus fourmiersi DOERING, Bol. Acad. 

 Nac. Cien. Rep. Arg., iii, p. 73. 



Shorter than B. tenuissimus, with deeper sutures. 



