DRYM^US, MEXICO AND CENTRAL AMERICA. 63 



Bulimus hepatostomus PFR. P. Z. S. 1861, p. 23, pi. 3, fig. 4; Malak. 

 Blatt. viii, p. 13 (1861); Monogr. Helic. Vivent. vi, p. 3.Bulimulus 

 (Drymceus) hepatostomus FISCH. & CROSSE, Miss. Scient. Mex., Mol- 

 lusca, i, p. 493, pi. 21, fig. 2, 2ct. Otostomus hepatostomus MARTENS, 

 Biol. Centr. Amer. Moll., p. 217, pi. 13, f. 18-20. 



" Nearly allied to 0. attenuatus, but less attenuated, also somewhat 

 variable in form. The brownish hue of the inside of the aperture is 

 in some specimens very distinct, in others scarcely to be seen. On 

 the outside of the second half of the last whorl the shell becomes in 

 some examples rather wrinkled." (Martens.) 



D. COSTARICENSIS (Pfeiffer). PL 2, figs. 19, 20 (21, 22). 



Shell perforate, ovate-fusiform, rather solid, irregularly striate, 

 whitish, painted with interrupted or serrate streaks of buff and light 

 red. Spire conic, the apex rather acute, corneous. Whorls 5, 

 scarcely convex, the last three-fifths the total length of the shell, more 

 inflated, having a prominent varix in the middle, tapering at base ; 

 columella compressed, thread like, slightly twisted. Aperture sub- 

 vertical, oblong-oval; peristome simple, narrowly expanded. 



Alt. 23, diam. 11, length of aperture 14J mill. (Pfr.) 



Alt. 31^, diam. 18J, length of aperture 16 mill. (Martens.) 



Central Costa Rica : San Jose (Pit tier and Biolley) ; San Fran- 

 cisco de los JRios, near San Jose, on hedges (Pittier) ; Alajuela, at an 

 elevation of 900-1000 metres above the sea (Orosco) ; Cartago and 

 Navarro (Boucard) ; elevated plain of Costa Rica (Hoffmann). 



Bulimus costaricensis PFR. in Malak. Blatt. ix, p. 153 (1862) ; 

 Monogr. Helic. Vivent. vi, p. 47 ; Novit. Conch, iii, p. 419, pi. 95, 

 figs. 11, 12. ANGAS, P. Z. S. 1879, p. klS.Bulimulus (Drymceus) 

 costaricensis PAETEL, Catalog, p. 100. Otostomus costaricensis 

 MARTENS, Biol. Centr. Amer. p. 217. Bulimus navarrensis ANGAS, 

 P. Z. S. 1878, p. 73, pi. 5, figs. 15, 16. 



" Very near Otostomus attenuates and 0. hepatostomus, but less 

 .attenuated, and with the stripes more interrupted, appearing in the 

 upper whorls rather like interrupted spiral bands. Father variable 

 in size and proportional breadth : see the measurements given under 

 the description above. Most of the specimens I have seen are some- 

 what more elongated and less ventricose than Pfeiflfer's original type ; 

 but there are many gradations in this respect. 



" Dr. Pfeiffer received his specimen of this species from Dr. von der 



