203 
5. Description or A New Genus or FrResHwaTER BIVALVE 
MOoLLuSsCA, BELONGING TO THE FAMILY CoRBULIDZ, FROM 
THE CoLLEeEcTION oF HucH Cumine, Ese. By Henry 
Apams, F.L.S. 
. Genus Himetsya, H. Adams. 
Testa tenuis, inequilateralis, inequivalvis, valva sinistra majore, 
clausa, parva constrictione ab umbonibus ad marginem ventralem 
extendente, epidermide vestita; umbonibus tumidis, obtusis. 
Cardo in valva dextra dente obscuro, in valva sinistra fossa 
congruente ; ligamento externo ; cartilagine interna, in carti- 
laginis processu angusto, sub-horizontali in utraque valva re- 
cepta. Linea pallialis vir sinuata. 
Shell thin, inequilateral, inequivalve; the left valve the larger, 
closed, with a slight constriction extending from the beaks to the 
ventral margin, covered with an epidermis; beaks tumid, obtuse. 
Hinge composed of an obscure tooth in the right valve, with a cor- 
responding cavity in the left valve; ligament external ; cartilage in- 
ternal, contained in a narrow, almost horizontal, cartilage-process in 
each valve. Pallial line slightly sinuated. 
HIMELLA FLUVIATILIS, H. Adams. . 
HH, testa transverse oblonga, antice rotundata, postice truncata, 
margine superiore sub-recto ; valvis externe rugosis, epidermide 
pallido-fusca ; umbonibus sub-anterioribus, decorticatis. 
Shell transversely oblong; rounded anteriorly, truncated posteriorly, 
the superior margin nearly straight ; surface of valves rugose, covered 
with a light-brown epidermis ; beaks subanterior, eroded. 
Long. 10, lat. 6, cras. 4 lin. ~ 
Hab. River Maranon. 
This interesting genus appears to have greater affinity with Azara, 
D’Orbigny, than with any other member of the Corbulide; but 
differs considerably from that genus in the form and texture of the 
shell, the thinness of the valves, and the disposition of the cartilage- 
processes of the hinge. In its habits also it is truly fluviatile, being 
found in the River Maranon, whence Mr. Cuming’s specimens were 
obtained by Mr. Bates. 
6. Note oN THE BLOOD-CORPUSCLES OF THE JAPANESE GI- 
GANTIC SALAMANDER (SIEBOLDIA MAXIMA). By Epwarps 
Crisp, M.D., F.Z.8., erc. 
The blood-corpuscles of this animal in their general aspect, irre- 
spective of size, bear a great resemblance to those of the Water-newt 
(Triton cristatus). They vary much in diameter, some being from 
a third to a fifth smaller than the majority. They are of a bright 
straw-colour, which colour they retain when dried on the glass; the 
nucleus and nucleoli being of a lighter hue and more transparent. 
The blood also contains innumerable transparent vesicles of an ellip- 
