EUC ALODIUM. 13 



Differs from E. walpoleanum in sculpture and form of the 

 aperture. It is more slender than the closely related E. ghies- 

 bregkti, and paler in color. From the form of the columella, 

 it probably has a straight and simple internal pillar. 



Group of E. splendidum. 



E. GRANDE (Pfeiffer). PL 6, figs. 30, 31, 32, 36, 37; pi. 8, 



fig. 20. 



Shell deeply rimate, turreted, broadly truncate, rather solid, 

 obliquely hair-striate, the interstices seen under a lens to be 

 obliquely striatulate, a little shining, brownish-ruddy. Suture 

 white-margined. 8 whorls remaining, a little convex, the last 

 obtusely carinate at the base, slightly protracted forward; 

 columella subplicate. Aperture slightly oblique, oval, sub- 

 angular above; peristome continuous, narrowly expanded, 

 slightly reflexed. Length 56, diam. 17 mm. ; aperture 13% 

 mm. long, 10 wide (P/r.). 



Juquila, Oaxaca, in south-central Mexico (Boucard). 



Cylindrella grandis PFR., P. Z. S. 1860, p. 139, pi. 50, f . 3 ; 

 Malak. Bl. viii, 1861, p. 80; Monogr. vi, p. 364; Novit. Conch, 

 iii, p. 455, pi. 100, f. 8, 9. SOWB., Conch. Icon, xx, pi. 1, f. 4. 

 Eucalodium grande Pfr., CROSSE & FISCHER Moll. Mex., i, 

 p. 371, pi. 15, f. 4. STREBEL, Beitr., iv, p. 68, pi. 5, f. 19.- 

 v. MARTENS, Biologia, Moll., p. 261. Eucalodium gracile 

 PAETEL, Catal., p. 102. 



The number of whorls varies from 7% to 8%, the length 

 from 52 to 60 mm. The sculpture according to Strebel, who 

 examined one of Pfeiffer's specimens, consists of fine, rather 

 weak, pretty closely crowded and only weakly arcuate riblets, 

 about 126 on the penult, whorl. They are not very regularly 

 arranged, and often are rib-like folds rather than ribs. On 

 the upper whorls they are sharper and more spaced, and as 

 usual they are more crowded near the aperture, coarser, and 

 fold-like. In the intervals, on the upper third of the whorls, 

 there are distinct, fine, sharp little folds, running obliquely 

 forward, showing also below on the last 3 whorls. The in- 

 ternal pillar is like that of E. walpoleanum, but perhaps more 

 sharply twisted around the axis. Aperture, peristome, col- 



