13 
indicate its affinity to the other viviparous Paludine, especially to 
the following. The keel, in some of the specimens, becomes almost 
obsolete near the aperture. 
PaLUDINA CINGULATA, N. 
Testa ovato-conica, acuta, anguste perforata, oblique striatula et 
lineis spiralibus subtilissimis decussata, virens vel brunneo- 
nigricans, apice violaceo-nigra ; anfr. 6-7, convexiusculi, supe- 
riores lineis elevatis spiralibus, nonnullis obsolescentibus sculpti, 
ultimus cingulo tumido mediano munitus ; apertura parum ob- 
liqua, ovato-rotunda, superne non acuta, cerulescenti-alba ; 
peristoma rectum, crassum, obtusum, extus sepius nigricans. 
Operculum corneum, concentricum, late ovatum, aureo-nitens. 
Long. sive alt. testee 55, diam. 31, alt. apert. 21 mill. (in speci- 
mine maximo). 
Leg. Mouhot. 
This species can be regarded as a link in the chain hetween P. 
oxytropis, Bens., P. tricarinata, Anton, P. angularis, Mill., and 
our European P. fasciata, Mill. (vivipara of Linn.). It is distin- 
guished from the latter by the presence of one, from all the former 
by the absence of the two superior spiral girdles, traces of which, 
however, are found-on the upper whorls. The single girdle is in 
most of the specimens much swollen, and is visible also on the 
penultimate whorl, on or a little above the suture. P. japonica, mihi, 
is also closely allied, but its body-whorl exhibits a canthus only in- 
stead of an elevated girdle, and its upper whorls no raised lines at all. 
PALUDINA POLYGRAMMA, Mm. 
Testa conico-oblonga, imperforata, striatula, fusco-viridis, fas- 
ciolis nigris numerosis (in anfr. ultimo 9) cincta, apice nigri- 
cante; anfr. 53, subplani, ad suturam tumidi, ultimus obtuse 
angulatus ; sutura impressa ; apertura ovalis, superne acuta, 
ceruleo-albida ; peristoma incrassatum, brevissime campanulato- 
expansum, nigro-limbatum. Operculum normale, concentricum, 
corneum. 
Long. 20, diam. 14, long. apert. 12 mill. 
Leg. Mouhot. 
Mus. Berol. 
Biraynia TRuNCATA, Eyd. et Soul. 
Testa conico-oblonga, rimata, levis, flavo-virens, apice truncata ; 
anfr. superiores 44, convexiusculi, sutura simplice discreti, 
ultimus obsolete fasciatus ; apertura oblongo-ovata, superne 
acuta, margine columellari fusco. Operculum ovatum, extus 
corneum, concentrice striatum, nucleo subcentrali, intus testa- 
ceum, homogenum, margine corneo. 
Long. 13, diam. 8, long. apert. 6 mill. 
This species is in shape similar to Paludina bulimoides, Olivier 
(cleopatra, Troschel), but it is essentially distinguished by the 
structure of the operculum ; the whorls, also, are more flattened. 
