MOLLUSCA — CTENOBRANCHIA. 
131 
transverse faint folds ; 6-7 whorls ; margin of mouth somewhat turned 
back, black. P. {Bithynia) longicornis ; four whorls; polished; margin 
of mouth somewhat turned back, blackish. P. {Bithynia) striatula ; 
polished ; horny ; margin of mouth turned back, blackish, wavy ; these 
are all from Chusan. 
Paluclina seminalis, Hinds, Ann. x. p. 83 ; obtusely turreted ; apex 
eroded ; mouth bluish ; California. (Allied to P. nuclea of Lea.) — 
P. regularis, Lea, Proc. Amer. Soc. 1841, p. 34; spherical; greenish 
horn coloured ; not umbilicated ; five whorls ; mouth large, interiorly 
blue : Ohio (?). P. ohtusa, id. ib. ; cylindrical ; greenish ; slightly 
umbilicated ; four whorls : Ohio. P. troostiana, id. ib. ; bellied out 
conically ; horn-yellow ; umbilicated ; mouth large, round : Tennessee. 
P. angulata, coosaensis and cyclostomaformis, id. ib. p. 83, from the 
Coosa River, Alabama. P. incrassata and coarctata, id. ib. 1843, 
p. 243, from Alabama. P. hermondiana, D’Orbigny, Cub. ; greenish ; 
umbilicated ; anteriorly slightly keeled. 
D’Orbigny describes, in the Hist, de Cuba, several species of his 
genus Paludestrina ; viz., P. auheriana, a^nis, candeana. 
Lea describes, in the volume already quoted, p. 34, five species of the 
genus Anculosa, — troostiana, gihhosa, dentata, carinata, variabilis ; 
and at p. 83, A. rubiginosa, bella, griffithiana, tubercidata ; and, 
1842, p. 243, A. incisa, Foremani, solida, Jiammata ; as also Amni- 
cola orbiculata and parva. 
lo tenebrosa, Lea, ib. ; testa fusiformi, subtenui, subnigra, laevi, spira 
conica, suturis vix impressis, anfractibus senis, subplanulatis, apertura, 
irregulariter pyriformi, intus purpurea : Tennessee. 
Laguncula, nov. gen. Benson, Ann. ix. p. 488, testa turbinata, sub- 
globosa, apertura majori, integra, oblonga ; peristomate interrupto ; 
labio subreflexo ; umbilico profundo, tortuoso. There is one species, 
L. pidchella, from Chusan. 
Haldeman makes some remarks on the genera allied to Melania. 
Pirena aurita he is inclined, on account of its fringed mantle, to place 
with the Cerithince (genus Claviger, Hald. ib. vol. xlii. p. 216). 
Pirena atra he considers as the type of the genus, and puts it in the 
family of the Melaniae, as he says it has the same connection with 
Melanopsis, as Melania has with Anculosa, in respect to organization 
and habits. (Sillim. Amer. Journ. vol. xli. p. 21.) 
The genus Melania is remarkably rich in newly described species. 
Two species, M. cancellata and M. {Hemisinus {^) Swains.) crebricostis, 
from Chusan, are described by Benson. (Ann. ix. p. 488.) In the first 
number of Philippi’s plates and descriptions of new Shells, the first 
plate is dedicated to the genus Melania ; and the new species are de- 
fined by V. d. Busch. M. Winteri ; turreted ; greenish ; near the suture 
a row of pointed protuberances ; basis striped : Java. M. jiammulata ; 
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