16 EUCALODIUM. 



evenly convex, the last having the base defined by a low cord. 

 Aperture oblique, nearly round, slightly angular above, pur- 

 plish within with a white lip-border. Peristome continuous, 

 very shortly free above, obtuse, hardly expanded. Columella 

 oblique. Internal axis slender, slightly sinuous. 



Length 28 l / 2 , diam. 10; length of aperture 8, width 7 mm. 



Length 32, diam. 9.2, apert. 8 mm. 



&an Sebastian, Jalisco, Mexico (E. W. Nelson). 



E. hippocastaneum DALL, Nautilus xi, p. 61 (October, 1897). 

 -v. MARTENS, Biologia, Moll., p. 633. 



Close to E. decurtatum, from which it differs in the dark 

 color and the stronger riblets of the later whorls. In other 

 respects the two species are alike. The type specimen has 

 8 whorls and is 32 mm. long; that here figured, one of the 

 type lot, is smaller with scarcely 6 l / 2 whorls remaining. 



E. RECTICOSTA (Pfeiffer). PL 3, figs 21, 22, 23. 



Shell rimate, subcylindrical, attenuated towards the trun- 

 cated apex, solid, whitish. Whorls 8, narrow, longitudinally 

 and closely ribbed, the ribs straight; the penultimate whorl 

 obtusely angulate above the suture, the last whorl at the peri- 

 phery, nearly smooth below the angle, not produced forward. 

 Aperture subvertical, obliquely oval ; peristome nearly sim- 

 ple, very narrowly expanded, appressed above. Length 36, 

 diam. 12 mm. ; width of the middle whorl scarcely 5 mm. 



(P/T.). 



Culata, near Manzanillo, State of Colima (W. Lloyd) ; 

 Oaxaca (Sowerby) ; Southeastern Mexico (Ghiesbreght) . 



Cylindrella recticosta PFR. in Philippi's Abbild. u. Be- 

 schreib., ii, p. 48, pi. 2, f. 3(1847) ; Monogr. ii, p. 369 ; Conchyl. 

 Cab. p. 8, pi. 1, f. 21, 22. SOWERBY, Conch. Icon. xx. pi. 13, 

 f. ll9.Eucalo<Hnm recticosta CROSSE & FISCHER, Moll. Mex., 

 i, p. 386, pi. 14, f. 12, 12 a. fc.-v. MART., Biol. p. 265. 



Distinguished by its strong sculpture and white color. The 

 aperture is nearly circular, as broad as long. The internal 

 pilhir is unknown. 



E. MOUSSONIANUM Crosse & Fischer. PI. 3, figs. 15, 16, 17, 18. 

 Shell slightly arcuate-subrimate, cylindric-turreted, rather 



