4 14 MOLLUSCA. 
c. Long. 66, diam. 574; apert. long. 47, diam. 30 millim. 
d. ,, 65, 4, 56; » 47, , 28 ,, 
e. 4, 63, 5, 53; ” 46, , 30 ,, 
f. 5, 60, 5, 55; 9 45, , 29 ,, 
g » 06, ,, 48; ” 39, 4, 25 ,, 
a. Fischer and Crosse’s figure 1; c, f. Specimens from Panzos ; d. One of Stoll’s specimens from Paso Antonio. 
Hab. N. Guatemata: Panzos (Bocourt ®°, Conradt) ; Cahabon (Sarg *°). 
W. GuaTtEMALA: Paso Antonio, in the lower part of the Rio Michatoya, near the 
Pacific coast (Stoll); Cerro Zunil (Champion). 
This variety differs more in general appearance from the Mexican type than the 
preceding ones, and I should have treated it as a distinct species if intermediate forms 
had not been collected by Conradt at Panzos. In Fischer and Crosse’s fig. 1 (t. 45) 
the aperture is comparatively more narrow, and the opposite side of the last whorl 
more bulky than in any of the specimens seen by myself: compared with fig. 1 of t. 46, 
which very probably represents the dorsal aspect of the same shell, it seems highly 
probable that the projection of the last whorl near the suture is due to a fault in 
drawing. 
The colour is very variable. The specimens from North Guatemala (Panzos and 
Cahabon) are generally rather dark brown, with the bands inconspicuous outside the 
aperture, but very distinct within it. Most of those from Paso Antonio are greenish- 
grey, with inconspicuous bands, which are sometimes obsolete, the interior of the 
aperture very dark blackish-purple, and the outer margin in the full-grown shell yellow. 
One from the same locality, on the contrary, is on the outside unicolorous light yellow, 
with the interior of the aperture white and the outer margin of the peristome yellow ; 
it may be regarded as a pale-coloured individual, approaching to albinism. 
Another specimen from Paso Antonio has the upper whorls much eroded, looking as 
if filed off, and on the last two whorls several linear sharply cut scratches are visible, 
running either in the spiral direction or obliquely to it, these often being parallel 
and close to each other: they are quite distinct from the malleated impressions, not 
only in their linear form, but also in having the periostracum destroyed and the deeper 
layer of the shell denuded, whereas the malleated impressions are rounded and covered 
by the normal periostracum. This fact proves that the malleated impressions are 
formed during the natural growth of the shell, the scratches, on the contrary, being 
caused by later external injuries. 
2. Ampullaria violacea. (Tab. XXII. fig. 3.) 
Ampullaria violacea, Valenc. in Humboldt & Bonpland’s Obs. Zool. ii. p- 259 (1833) '; Fisch. & 
Crosse, Miss. Scient. Mex., Mollusca, ii. p. 341, t. 46. figg. 4, 4a”. 
Ovate-globose, remarkably broad, the last whorl narrowing distinctly in the two lower thirds of its length 
(instead of being more convex in the median third as in A. flagellata). Suture rather superficial. 
Outside pale greenish, with narrow inconspicuous bands; inside the aperture pale brown, whitish only in 
