264 MOLLUSCA. 
Distinct by the comparatively very small aperture ; colour as in the preceding 
species. 
The specimen from Albers’s collection, figured by Strebel *, is before me, and I have 
no doubt that it belongs to the species described by Crosse and Fischer, differing only 
in being a little longer and less ventricose, but with the same number of preserved 
whorls (9). 
18. Eucalodium truncatum. (Tab. XVI. figg. 3-9.) 
Bulimus truncatus, Pfr. Symb. Hist. Helic. i. p. 43 (1841) ?; Philippi’s Abbild. neuer Conch. 1. p. 55, 
t. 1. fig. 82; Monogr. Helic. Vivent. ii. p. 154°, and viii. p. 181°; Malak. Blatt. xxi. p. 37 
(1872) °; Reeve, Conch. Icon. v., Bulimus, t. 70. fig. 1 (nec t. 69. fig. 498) (young 
specimen) °, - 
Cylindrella truncata (Pfr.), v. Mart. Malak. Blatt. xii, p. 13 (1865) ”. 
Eucalodium truncatum, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 892°. 
Eucalodium martensii, Strebel, Beitr. Mex. Land- und Siissw,-Conch. iv. p. 73, t. 13. fig. 18, t. 11. 
figg. 8 (radula) and 14 (jaw), t. 12. fig. 3 (genitalia) *. - 
Hab. CentraL Mexico: Angangueo, in the State of ‘Michoacan, under the leaves of 
Agave americana (Hegewisch 1~*)..- 
S.W. Mexico: Omilteme, in the State of Guerrero (H. H. Smith). 
Mexico: without nearer indication of locality (Uhde). 
Mr. H. H. Smith having obtained several specimens of this interesting species in 
Guerrero, I am now able to give a fresh description and figure of it:— _ 
Adult shell cylindrical-turrite, with close-set very. fine striae, which are more oblique in the upper half, more 
vertical in the lower half of the visible part of each whorl, glossy, greenish-brown, white at the suture. 
Remaining whorls 63-8; on the upper whorls the strie are comparatively stronger (so much elevated 
that the sculpture might be termed costulate), a little rough, and more equally oblique, being more 
vertical just above the suture only. The upper whorls are also distinctly more convex than the lower ones. 
Aperture very little produced beyond the suture, nearly circular, but rectilinear above, where it is nearest the 
preceding whorl, and making here a very obtuse angle with the strongly arcuated outer margin ; peristome 
continuous, as usual in this genus, very shortly expanded, obtuse, white; columellar margin also well 
arcuated, but behind it, in the depth of the aperture, is a distinct white fold, rising up very steeply, 
without angle. Young specimens (figg. 8, 9) are somewhat concavely turrite, and resemble the figure 8 ¢ 
in Philippi’s ‘ Abbildungen’; they indicate that the whole number of whorls is at least 14 or more, but 
even in these the tip is truncated and the hole filled up by a convex whitish wall. The dimensions of 
the adult specimens (with continuous, expanded, and slightly produced peristome) are somewhat different, 
as shown by the following measurements :— 
The largest (8 whorls).......... 35 millim. long., diam. 93; aperture 7} long (high), 7 broad (diam:),” 
The smallest (74 whorls)........ 24 4 - » 83 ” » 8 s \ 
The most slender one (8 whorls).. 253 ” » 7 5 » 6 ” 6 09 
Cylindrella transaperta, Sowerby, in Reeve’s Conch. Icon. xx., Cylindrella, t. 9. 
fig. 77, locality unknown, perhaps belongs to this species. 
