130 
REPORT ON ZOOLOGY, MDCCOXLTi: 
Benson notices the presence of Planorhis spir'orhis, Miill., and Lim- 
nceus glaber, MiilL, in Ireland. (Calcutta Journal, vol. ii. p. 223.) 
Planorhis papyraceus, Benson (Ann. ix. p. 487) ; very minutely ra- 
diato-striated ; keeled at the margin ; hollowed on both sides. PL hemi- 
sph(Erula, id. ib. ; superiorly convex, beneath hollowed ; without keel : 
these are from Chusan. PI. reg\daris, Lea, Proc. Amer. 1841, p. 32 ; 
spherical ; plain superiorly, beneath narrow umbilicated ; transparent ; 
pale yellow ; three whorls keeled superiorly : United States. 
PI. huchanensis, id. ib. ; lenticular ; keeled at circumference ; be- 
neath narrow umbilicated ; three whorls : Ohio. PL hellus, id. ib. ; 
orbicular ; beneath wide umbilicated ; gTeenish-yellow ; four whorls, 
keeled above, sub-keeled beneath ; interiorly reddish-brown : Tennessee. 
Lymnea plicatula, Benson (Ann. ix. p. 487) ; last whorl transversely 
with plait; the suture impressed; spire pointed, generally ferruginous. 
L. minor, id. ib. ; smooth ; four whorls ; fold of collumella obsolete : 
both are from Chusan. 
Lea describes sixteen species of this genus in the Proc. Amer. Phil. 
Soc. 1841, p. 32, viz., L. philadelplvioa, from Philadelphia ; griffithiana, 
from Lake Charlotte, New York ; nuttalliana and hulimoides, from 
Oregon ; exigua, from Tennessee ; planulata, White Sulphur Springs, 
Va. ; fusiformis, Niagara ; rustica, Ohio ; plica, Tennessee ; coo.rctata, 
Newport ; casta, parva, curta, strigosa, hirtlandiana, from Ohio ; 
rnhella, from Oahu. 
CTENOBRANCHIA. 
NEW GENERA AND .SPECIES. 
Valvata hicarinata. Lea, Proc. 1841, p. 83; t. orbiculari, superne 
planulata, bicarinata, subcrassa, superne cornea, inferne albida, late 
umbilicata, suturis impressis, spira depressa, anfractibus quaternis con- 
vexis, apertura rotunda, intus albida : Schuylkill River. 
Paludina Breughelii, Cantraine, Bull, de Brux. ix. 2, p. 349 ; testa 
ovatO' conoidea, solida, corneo-fulvescente, epidermide viridi-fusco ; anfr. 
4-5 convexis ; apertura ovali, superne vix angulata, spiram non 
aequante, peristomate continuo, labro simplici : Malta. 
Paludina suhfusca, id. ib. ; testa conoidea-depressa, subperforata, 
corneo-viridescente aut fulva sub-epidermide fusca ; anfr. 3-4 convexis ; 
apertura ovato-rotundata, superne vix angulata, spiram superante ; 
labro acuto simplici ; labio reflexiusculo, subincrassato, peristomate 
continuo : Istria and Dalmatia. 
Paludina quadrata, Benson, Ann. ix. p. 487 , olive green, with 
slight transverse plaits ; furrowed longitudinally. P. lecythoides ; with 
174 
