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rotundd, intus rufd, ad basim angulatd; labro repando, rufo- 
marginato ; columelld incrassatd. 
Hab. Marshy places, Vera Cruz, Mexico. 
Length °8, diam. *3 of an inch. 
Remarks.—Neither of the four specimens under examination are 
perfect, all being much eroded at the apex. Under the microscope 
the surface may be observed to be papillose, a character rarely found 
in this genus, though not very uncommon in Helix. The aperture is 
rather more than one-third the length of the shell and is unusually 
rotund. The rufous line surrounds the peritreme. The aperture is 
reddish inside. 
Mexania Cuminet. WM. testa striatd, turritd, superné uno-cari- 
natd, subcrassd, tenebroso-fuscd ; spird valdé elevatd; suturis 
regulariter impressis ; anfractibus planulatis, lineis raris impres- 
sis; aperturd magnd, subtriangulari, intus cerulescente ; colu- 
mella retusd contortdque. 
Hab. Very small streams, island of Siquijor, Philippines. 
Length 2°5, diam. *7 of an inch. 
Remarks.—This is a very remarkable species. A single specimen 
only was sent by Mr. Cuming, and this unfortunately is by no means 
perfect. There is a good deal of ferruginous matter deposited over 
the surface, and the apex is so much eroded that the number of 
whorls cannot be well ascertained, perhaps about nine. The turrited 
form of the shell is very notable. Immediately under the suture 
there is an elevated and cordlike line, slightly angular on the superior 
part. Below this the whorl is slightly impressed. Part of the sur- 
face is wrinkled by the transverse striz decussating longitudinal 
lines. The aperture is about one-third the length of the shell, and 
remarkable for its triangular form. The columella is unusually white, 
which shows in contrast with the dark epidermis. The operculum is 
large and thick, having its polar point near to the lower border. 
Meant pactyius. WM. testd striatd, valde elevatd, superni cos- 
tatd, crassd, vel fused vel luteo-corned ; spird valde elevatd ; su- 
turis impressis; anfractibus duodecim, convevis, lineis crebris 
elevatis ornatis ; costellis verticalibus crebris ; aperturd submagnd, 
subrotundatd, intus vel salmonid vel ceruled; columelld incrassatd, 
salmonid tortdque. 
Hab. Small streams in Guimaras, Mindanao, Luzon and Seyte, 
Philippines. 
Length 3°2, diam. 1 inch. 
Remarks.—This is a remarkably fine, large, and protean species. 
There are about two dozen specimens under examination from various 
islands of the Philippines. The prevailing character of the surface 
is striate with decussating costee on the superior whorls; but some 
specimens have these costze enlarged on the lower whorls, instead of 
their having vanished, as on others. Some again have their costz 
rising into a series of pointed tubercles. Under the microscope many 
numerous minute strize may be observed to revolve parallel with the 
coarser ones. Another variety is quite smooth on the upper whorls, 
