197 
Rivultna is proposed provisionally. The general outline and oper¬ 
culum are those of the Paludina. In old specimens the peritreme of 
the mouth is continuous, but there is only a slight depression behind 
the columella in place of an umbilicus. The upper whorls are occa¬ 
sionally faintly lined or spotted with brown. 
Melania pagoda. M. testa spinosa, turritd, costatd, transversim 
striata, tenui, diaphana, corned, maculis badiis minutis linearibus ; 
spira elongatd, subovata, acuminata, scalariformi; suturd lineari; 
anfractibus decern, superne angulatis et subconcavis, angulo spinu¬ 
losis ; costulis obliquis longitudinalibus, inf erne obsoletis, superne 
in spinulas aut denticula eversa productis, in anfractibus superio- 
ribus crebrissimis et magnis, inferioribus minoribus rarioribusque; 
striis transversis, parvis, crebris, alternantibus, maculatis, lineolis 
longitudinalibus decussatis; anfractu ultimo usque ad basim striato; 
aperiurd ovatd, superne acutd, inferne effusa. 
Hah. Isle of Guimaras, Philippines. 
Length L4, diam. *6 of an inch. 
Remarks .—A beautiful little species, with irregular spines, very 
strongly marked on the upper whorls, but which sometimes diminish 
to denticulations on the lower. It can be mistaken for none of its 
congeners, except perhaps the M. cochlea. 
3 . Description of five new species of Anodontje, col¬ 
lected by H. Cuming, Esa. in the East Indies. By 
Isaac Lea. 
Anodonta gracilis. A. testa lata, subcylindraceaincequila- 
terali; valvulis tenuibus; natibus subprominentibus; epider- 
mide luted; margarita vel albd vel purpurea. 
Hab. Dingle, Isle of Panay. 
Diam. 1 ; length 1*7; breadth 3 - 4 inches. 
Remarks. —This species is more cylindrical than is usual with the 
Anodontce, and differs from the other species taken by Mr. Cuming 
in this character: it is rounded anteriorly, and is subangular pos¬ 
teriorly. The dorsal margin is nearly straight, the basal margin is 
slightly emarginate, the disc being disposed to be flattish. In the 
specimens under examination, the beaks are all more or less eroded, but 
in the youngest there are slight indications of undulations. The liga¬ 
ment is thin and long; the marks of growth are distant and rather 
dark, and the epidermis in the young is yellow or greenish, in the 
older it is darker and brown ; the anterior cicatrices are distinct; the 
dorsal small, and placed in the cavity of the beaks. 
The five species herein described are remarkable in the character 
of the dorsal line, which rises immediately under the margin into a 
dentoid line, somewhat lamellar, and approaching in its character the 
more distinct tooth of the genus Dipsas (Leach). In the younger 
specimens this is much more distinctly marked, and in the older it 
becomes obsolete. This group of Anodontce, having this dentoid 
character, would seem to form a natural connexion on one side with 
