98 ODONTOSTOMUS. 



last obese, having a pit behind the basal lip. Aperture vertical, 

 ovate-truncate, nearly closed by the large teeth : a twisted, angular 

 composite parietal lamella, bifid outwardly, a very large subvertical 

 lamella upon the columella, two or three compressed folds within the 

 basal lip, an oblique, twisted, large upper palatal plate-like fold in 

 the middle of the outer lip, and two small tubercular, separated 

 suprapalatal folds ; standing within from the lower palatal fold there 

 Js an erect trausverse barrier. P.-ristome thin, expanded. 



Length 21, diam. 12 mill. (Deshayes' type). 



Length 21, diam. 10-11, length of aperture 10 mill. 



Length 19, diam. 10, length of aperture 9J mill. 



Argentina : Provinces of Cordova and San Luis. 



Pupa dadalea DESH. in Fer., Hist., ii, p. 217, pi. 162, f. 23, 24. 

 Bulimus dczdahvs Dh., PFK., Conchy]. Cab., p. 194, pi. 56, f. 11- 

 14; Monogr. iii, p. 370 ; iv, 438 ; vi, 76 ; viii, 613. HIDALGO, Journ. 

 de Conchyl., 1870, p. 51. KOBELT, Jahrb. d. D. Malak. Ges., 1880, 

 p. 286, pi. 9, f. 1-7; with var. mayor Doer., p. 287, f. 1, 2 ; var. 

 minor Doer., 1. c., f. 5, 6; var. multidentatus Doer., 1. c., f. 7. Biili- 

 mus (Odontostomus} dcedahus STROBEL, Mater. Maiac. Argent., p. 

 16, with var. major B. (Plagiodontes} dcedahus Dh., KOBELT, 

 Jahrb., 1878, p. 133, with var. strobelii and salinicola Doer, (no de- 

 scription). Odontostomus dcedaleus Dh., DOERING, Periodico Zoolog- 

 ico, Organo de la Sociedad Zoologica Argentina, i, entr. 3 (1875), 

 ]). 198200, with var. major, minor, multidentatus. Plaqiodontes 

 dcedaleus Dh., DOER., Per. Zool. ii, entr. 4 (1877), with var. strobelii 

 (p. 239) and salinicola, p. 240 Odontostomus dsedaleus Dh., MAR- 

 TENS, Conch. Mittheil., p. 158. 



A common species in central Argentina, at Cordova, etc. ; the 

 locality " Brazil " given by Deshayes being erroneous. It varies 

 widely in form, and in the development of the minor folds within the 

 basal lip. Deshayes' type had three basal denticles, but most of the 

 specimens before me have but two, while Doering found a larger 

 number in some forms of the species. 



Var. major Strobel (1874). Shell with produced, acute, conic 

 spire ; two teeth within the basal lip of the aperture. Length 25, 

 diam. 12 mill. (Strobel}. Foot of the Sierra del Morro, near San 

 Luis, province of San Luis (Herrero). 



This is apparently identical with var. major ("mayor") of Doering, 

 later in date. The latter (pi. 14, figs. 6, 7) is described as 24 to 26 



