60 
JIOUJISCA. 
There is one species which is remarkable for a border and stony 
traverse, on the internal face of its operculum *. 
The organs of respiration in these animals are arranged as in the 
Cyclostoma?, and like the latter they can live out of water f. 
jMelaxia, Lam. 
A thicker shell ; the aperture, higher than it is wide^ enlarges oppo- 
site to the spire ; the columella without plicpe or umbilicus; length of 
the spire very various. 
The Melanioe inhabit rivers, but are not found in France, the ani- 
mal has long tentacula, the eyes being on their external side, and at 
about the third of their length;];. The 
Kissoa, Freminv. — Acmea, 11 art m. 
Differs from Melania, because the two edges of the aperture unite 
above§. The 
iMELAXopsis, Ft mss., 
'Where the form is nearly that of a Melania, differs from it in a 
callus on the columella, and in a vestig’e of an emargination near the 
bottom of the aperture, which seems to indicate a relation with the 
Terebra? of Brugieres||. In the 
PiRENA, Lam., 
We not only find this little sinus beloAV, but likewise a second on 
the opposite side^J. 
These two subgenera, as well as the Melaniac, inhabit the rivers of 
southern Europe and of all hot countries. 
There are two genera, detached from the "Volutse, which, but that 
The llcl. ncriteUa, List., LXl, 59, copied Bfainv., Malac., xxxix, 2. 
•f' It is from tliis eircumstance that M. de Ferussac has been induced to class 
this subgenus with that of the Cydostoma in an order which he names the Pul- 
nwnea Optrcuhda. Sec the Monograph of this genus by M. Gray, Zool. Journ., 
Nos. 1 and 2. 
J Mchdiie tkiare (Mehniui anmrida, Lam.), Cliemn., Tab., 134, f. 121S and 1219 ; 
from tlie Isle of France and Madagascar. 
Add, Md. fruiicata, Lam., Encyclop., pi. 458, f. 3, a — b ; — Mtl. courctutu, Id., 
Encyclop., pi. 458, f. 5, a — b., and a great many fossil species, among which are, 
Mel. semi-plucuta, Defr. ; — Mel. Cuvieri, Uesh., Coq. Foss., des environs de Paris, 
tome II, pi. xii, f. 1, 2 ; — Md. consleUaia, Lam. 
§ M. de Fremiiiville describes seven species in the Nouv. Bullet, des Sc. 
Nat. de la Soc. Phil., 1814, p. 7, and INI. Audouin, three, in the Dcscr. de I’Eg. ; 
Riss. Frcndiivillii, Coq., pi. iii, f. 20; — Kiss. Desmarestii, Ib., 21 ; — Kiss. Orhignii, 
Ib., f. 22. 
II Melan. bucdnu'idcd, Fch'uss., Mem. de la Soc. d’llist. Nat. de Paris, tome 1, pi. 
vii, f. 1 — 11, &c. See Sowerby, No. XXII. 
*J Fir. lerehridis, Lam.; List. Tab. 115, f. 10; — Fir. muduoHscariensis, Flncycl., 
pi. 458, f. 2, u, b, &.C. 
