412 MOLLUSCA. 
the shell pale violet or reddish, with a blackish stripe behind the dextral margin of the aperture; peristome 
scarcely expanded in its lower half. 
Long. 77, diam. 65; apert. long. 54, diam. 32 millim. 
Hab. S.E. Mexico: Tabasco (Lokkes 7° 24), 
I give here a figure of a specimen in the late Dunker's collection which nearly agrees 
in size and shape with Jonas’s original figure, and differs only in the pale reddish colour 
of the interior of the aperture. An example of the same form was also obtained in 
Tabasco by Captain Fokkes, and given by Dr. Jonas to Prof. Dunker. It is even 
possible that the first-mentioned specimen may be the type of Jonas’s description, the 
dark colour of the inside of the shell in his figure being perhaps due to the circumstance 
that the draughtsman held the shell so that the visible part of the inside was mostly in 
deep shadow, and only the part next the margin in the light; if viewed in this manner, 
our specimen fully agrees with the figure. In the text the inside of the aperture is 
said to be of a beautiful violet, whereas in the figure it is blackish-blue. 
Fischer and Crosse’s large-sized specimen from Tabasco (loc. cit. t. 45. fig. 1 and 
t. 46. fig. 1) differs from the var. malleata in being remarkably more broad, especially 
in the last whorl, with deeper suture and without malleated impressions; the outside 
of a darker brown colour, with some narrow bands in the lower half of the whorl. It 
is doubtful if this example really belongs to the same species. Not having seen 
Morelet’s specimens from Balancan in Tabasco, this locality cannot be quoted for any 
of the varieties of A. flagellata. 
Var. gigantea. (Tab. XXIII. fig. 6.) 
Pomus giganteus, Tristram, P. Z. 8. 1863, p. 414”. 
Very large and comparatively broader than the type of A. flagellata, var. malleata, but not otherwise differing 
from it. 
Long. 91-95, diam. 86-90; apert. 66-69, diam. 39-44 millim. 
Hab. N. Guatemata: Lake of Peten (Salvin 2°), 
Through the kindness of Canon Tristram I have been enabled to examine and 
figure a specimen of this large form. The dimensions of the shell before me do not 
coincide with those given in his description, being respectively 91:86 for the whole 
shell, and 69°44 for the aperture, instead of 95:90 and 66°39, as indicated by him; it 
may therefore not be the actual example measured by him, though in all other respects 
the shell answers very well to the description. The complete malleated surface of the 
outside, the rather acute conical spire, the superficial suture, the pale green colour, 
passing on the spire into pale greyish-violet, with the apex itself somewhat dark 
brownish, the yellowish, scarcely expanded peristome, and the violet inside of the 
aperture, bordered towards the peristome by a much darker streak, are all suggestive 
of A. malleata, Jonas; but the specimen before me is somewhat more globose, the 
diameter being 0°94 of the length, and the breadth (diameter) of the aperture 0°64 of 
