30 BULIMULUS-SCUTALUS. 



Group of B. cequatorius. 



A group of the Ecuador Andes, characterized by the narrow or 

 imperforate umbilicus, etc. 



B. ^QUATORIUS (Pfeiffer). PI. 7, figs. 1, 2, 3, 4, 5. 



Shell oblong-ovate, narrowly umbilicate, solid, whitish or light 

 brownish-yellow, with indistinct white vertical streaks, encircled 

 with three purple-brown bands, the middle one often narrower, all 

 generally more or less interrupted and usually not sharply defined, 

 sometimes obsolete. Surface lusterless or somewhat shining, irreg- 

 ularly wrinkle-striate, sometimes obsoletely decussated above. Ap- 

 ical whorls densely and minutely wave-striate, sometimes appearing 

 striate-pitted. Spire convex conic, the apex rather obtuse. Whorls 

 6, rather convex. Sutures impressed. Aperture half the length of 

 shell, ovate, slightly oblique, banded, or white inside ; peristome 

 simple, the outer lip not expanded, columellar lip quite broadly 

 dilated above, columella with a convex entering fold. 



Alt. 34, diam. 17 mill. 



Alt. 32, diam. 16 mill. 



Alt. 26i diam. 13 mill. 



Ecuador: Mt. Chinchulagua and Chimborazo (Bourcier) ; Quito 

 and environs (Paz, Ortou, Boetzkes and others) ; La Mocha (Paz) ; 

 Mululo, near Lacatunga, at the foot of Cotopaxi, 3059 meters alt. 

 (Stiibel) ; Casha Loma; Mt. Pinchincha, near Quito (Cousin). 



Bulimus cequatorius PFR., P. Z. S., 1852, p. 155 ; Mongraphia, 

 iii, p. 420 ; viii, p. 170 ; Conchyl. Cab., p. 101, pi. 33, f. 1-4. HI- 

 DALGO, Journ. de Conchyl., 1870, p. 59 ; Viaje al Pacif., p. 104. 

 CROSSE, Journ. de Conchyl., 1871, p. 317. Scutalus cequatorius 

 MILLER, Malak. BL, xxv, 1878, p. l^.Bulimulus (Scutalus) 

 cequatorius MARTENS, Conch. Mittheil., p. 161. Thaumastus cequa- 

 torius COUSIN, Bull. Soc. Zool. de France, xii, 1887, p. 222 (with 

 vars. major, interrupta and immaculata, mentioned but not described). 



This species is quite variable. The bands are interrupted by 

 white streaks into spots in some examples, in others being very ir- 

 regularly interrupted at wide intervals, and rarely almost continu- 

 ous. The body-whorl occasionally lacks bands, having a few 

 oblique brown streaks or none ; the young are almost imperforate. 

 The color-varieties seem to occur too indiscriminately to allow of 

 varietal distinction in the five trays of this species before me. 



