54 DRYM^EUS, MEXICO AND CENTRAL AMERICA. 



0. fenestrellus ; but in his other work it stands alone for the whole 

 species, owing possibly to the unintentional omission of the locality 

 Tenango. Neither Fischer and Crosse nor Strebel have noticed this. 



D. JONASI (Pfeiffer). PI. 10, figs. 64, 68, 69, 70, 71. 



Shell perforate, oblong-conic, rather thin but moderately solid ; 

 shining, white or biif, with numerous narrow longitudinal corneous or 

 corneous -brown streaks, occupyiny the sulci between prominent, unequal 

 wrinkles or folds of the surf ace ; rather slight and superficial spiral 

 stride appearing under the lens. Spire long, the apex obtuse, with 

 typical Drymaus sculpture, whorls nearly 6, nuoderately convex, the 

 last revolution of the suture deeply impresses 



Aperture long-ovate, colored within like the outside; peristome 

 thin, acute, the outer lip moderately expanded in large individuals; 

 columellar margin reflexed for a short distance above. 



Alt. 26, diam. 11, length of aperture 12^ mill. 



Alt. 24^, diam. 11, length of aperture 12 mill. 



Central Guatemala : Environs of the city of Guatemala (Salle, Stoll); 

 Antigua and Amatitlan (Stoll) ; Duenas (Champion). [? N. Guat- 

 emala : Vera Paz. (by error Vera Cruz) (Delattre) ; Coban 

 (Salvin)]. Costa Rica (van Patten in Berlin Museum). 



Bulimus jonasi PFR. in Philippi, Abbild. neuer Conch, ii, p. 

 125, pi. 5, fig. 4 (1846) ; Monogr. Helic. Vivent. ii, p. 107 ; in 

 Martini & Chemnitz, Syst. Conch. -Cab., ed. 2, Bulimus, p. 168, 

 pi. 50, figs. 11, 12 DESHAYES, in Ferussac, Hist. Nat. Moll. Terr. 



ii, 2, p. 183, pi. 150, figs. 17, 18 REEVE, Conch. Icon, v, 



Bulimus, pi. 55, fig. 363. Bulimus (Leiostracus) jonasi PFR. in 

 Malak. Blatt. ii, p. 153 (1855). Otostomus (Leiostracus] jonasi H. 

 & A. ADAMS, Gen. Rec. Moll, ii, p. 151. Bulimulus (Mormt/s) 

 jonasi .MART, in Albers, Die Helic. ed. 2, p. 216 BINNEY, Am. 

 Journ. Conch, vii, p. 182 (1872) (jaw, radula). 



Bulimulus (Scutalus) jonasi FISCH. & CROSSE, Miss. Scient. 

 Mex., Mollusca, i, p. 525, pi. 23, figs. 7, 7a. Bvlimulus jonasi 



MART, in P. Z. S. 1875, p. 648; Jahrb. d. M. Ges. iii, p. 257 



O. STOLL, Guatem. Reisen, p. 53 (1886). Otostomus (Mormus) 

 jonasi MART, in Conch. Mittheil. ii, p. 193; Biol. Centr. Amer., 

 Moll., p. 212, pi. 13, f. 11-13. Mormus jonasi W. G. BINNEY, 

 Ann. N. Y. Acad. Sci. iii, p. 123 (jaw and teeth). 



D. jonasi, like the allied ghiesbreghti, varies a good deal in the 



