BULIMULUS, TYPICAL. 35 



earlier 2 whorls vertically, closely and minutely lineolate-punctate. 

 Whorls 6 to 7, moderately convex. 



Aperture ochre-brown to deep purple-brown inside, about half 

 the shell's -length or slightly less; peristome thin and unexpanded, 

 the columellar margin dilated above. 



Alt. 25, diam. 12* mill. 



Alt. 2H, diam. 11 mill. 



Quito (Bourcier) ; Ambato (Paz) ; Pillaro (Martinez) ; Ecuador. 



Bulimm catlowice PFR., P. Z. S., 1852, p. 154 ; Conchyl. Cab., p. 

 101, pi. 33, f. 5, 6 ; Monogr., iii, p. 427. HIDALGO, Viaje al Pacif- 

 ico, p. 128, pi. 7, figs. 9, 10. B. catlowce of some authors. Bulimus 

 catlovice and B. irregularis (Pillaro specimens) HIDALGO, Journ. de 

 Conch., 1870, p. 63 ; compare J. de C., 1875, p. 128. Scutalus cat- 

 lowice MILLER, Malak. Bl., xxv, p. 194. 



This form, with B. irregularis, are probably varieties of B. qui- 

 tensis Pfr., which I have placed in Lissoacme, not knowing the api- 

 ical characters (see vol. x, p. 158). 



Subgenus BULIMULUS Leach. 



Bulimulus LEACH, Zool. Misc. i, p. 41 (1815). Leptomerus AL- 

 BERS, Die Hel. p. 166 (1850). ALB. MART., Die Hel. p. 222, type 

 B. linnceoides Fer. 



Bulimuli of ovate or oblong contour, perforated, uniform brown 

 or corneous, or rarely with a few spiral bands ; aperture ovate, the 

 outer lip simple or but slightly expanded, thin or thickened within. 

 Apical whorls delicately rugulose. Type B. exilis Gmel. 



Distribution, tropical America, extending South in eastern South 

 America to Argentina. 



It is practically impossible to draw a line between typical Buli- 

 mulus and Leptomerus. B. exilis, type of the former group, varies 

 from quite solid and thick forms to others of thin substance, and 

 from banded to one-colored specimens ; and as the sole differential 

 character of Leptomerus is the delicacy of its monochromatic shell, 

 it is readily seen, when any large series of the Antillean species is 

 examined, that this supposed distinction is artificial and impracti- 

 cable. 



In some of the thinner species, such as most of those of Central 

 and South America, the apical sculpture is shallow and faint, re- 

 quiring a strong lens and well preserved specimens. As the apices 

 of many of the Argentine Bulimuli are unknown, it is not unlikely 



