146 
REPORT ON ZOOLOGY, MDCCCXLII : 
Leda, Schum. Animal tubis brevibus, tenuibus, rectis praeditum, 
pede longo, tenui, flexili; pallio toto aperto, marginibus simplicibus. 
Testa transversim ovata, solidiore, antice rotundata postice plus minus ve 
elongata, coarctata truncata, intus pariete rudimentali, quae tubulos sepa- 
rare videretur, praedita, parte truncata, ubi valvae paululum hiant, costis 
duabis obsoletis divergentibus, a natibus egredientibus, inclusa, serie 
dentium levius angulata, dentibus angulatis, imbriciformibus. L. maci- 
lenta, Stp., and L. complanata, are new species. 
Yoldia, Moller ; animal tubis longis curvatis instructum ; pede 
magno, valido ; pallio toto aperto, marginibus postice ciliatis. Testa 
transversim ovata, fragili, antice valde, postice parum hiante, antice et 
postice rotundata, pariete rudimentali tubulorum destituta ; serie den- 
tium leviter angulata, dentibus angulatis, imbriciformibus. Nucula 
arctica, Gray, and Y. angularis {Nuc. myalisy Couth. ?) 
The genus Unio has been enriched by several new species in Philippi’s 
description of new Shells. In the first number is found a plate, devoted 
to the species of this genus. U. parvus^ Barnes, is figured, besides two 
that are new. U. semigranosus, v. d. Busch, from Mexico ; roundish, 
compressed, mostly covered with oblong grains, blackish, internally dirty 
purple coloured. U. gratiosus, Parreiss. ; small, with radiated wrinkles : 
from New Holland. 
Two species from Chusan are described by Benson; Annals, ix. 
p. 489. U, {Theliderma, Swains.) Leaii, and U. (Theliderma) diver- 
gens. 
Lea has described many species in the Proc. of Amer. Phil. Society. 
In the volume for 1841, p. 30, there are eight species : U. sapotalensis 
and tecomat&nsis, from Mexico ; rajahensis, from Calcutta ; highyensis. 
Big., Bigby Creek ; crocatus, Savannah River ; callosus, Ohio ; dut- 
tonianus, Savannah ; georgianus, Stump Creek. Again, at p. 82, there 
are five species : U. hrumleyanus, Warrior River ; regularis, French 
Broad River ; moestus, Do. ; sparsus, Holston River ; argenteus, Do. — 
Anodonta gihha, Benson, 1. c., from Chusan ; A. montezuma, Lea (Proc. 
Amer. Phil. Soc. 1841, p. 31), from Central America; A. globosa, id., 
from Mexico. 
M. Neuwyler has given a zootomical contribution on the organs of 
generation of Unio and Anodonta (Neue Denkschr. der Allgem. Schweiz. 
Gesell. Band. vi. Neufchatel, 1842). He holds that these animals are 
hermaphrodite, and the brown gland, which lies between the heart and 
abdomen, he considers to be the testis. 
Castalia Duprei, Recluz, Rev. ZooL, p. 305, without longitudinal ribs ; 
dentibus cardinalibus tribus subverticalibus ; dente laterali antica et 
mediana in valvula dextra exterius sulcata, postica biserrata ; dente 
antica suprema in valvula sinistra interius sulcata, posticalibus binis 
integerrimis : Brazilian Sea. 
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