298 Mr. A,Adams on the Molluscan Fauna of Japan. 
- 
 structo; labro margine in medio obtusim angulato; colore fulvi- 
- cante, 
Hab. Satanosaki, ath coast of Kiusu; 55 fathoms. 
Genus Zurpons, A. Adams. 
On comparing my examples of this curious little genus, I 
observed that I had confounded two species under the name 
calceolina. The second of the two I beg leave now to describe 
under the nanie of 
Zeidora reticulata, A. Adams. 
Z, testa oblonga, dorso convexa, lineis elevatis longitudinalibus ra- 
diantibus et lirulis concentricis pulcherrime. decussata ; apertura 
margine crenulato, fissura profunda angusta. 
Hab. Mino-Sima; 63 fathoms. 
This species differs from Z. calceolina in being much more 
convex, less obtuse anteriorly, and in the fissure being narrow 
and deeply incised. The sculpture, moreover, is very different, 
the surface being finely reticulate instead of widely cancellate. 
Yokuhama, August 11, 1861, 
XXXITI.—Note on the Molluscan Fauna of Japan. 
By Arruur Apams, F.L.S. &e. 
Wiru regard at least to the Molluscan fauna, the Manchurian 
province, indicated with doubt by Professor Edward Forbes in 
his ‘ Map of the Distribution of Marine Life,’ does not exist. 
The Japonian province is bounded on the north by the Ok- 
hotzian and on the south by the Indo-Pacific province, and it 
receives contributions from both. Littorina grandis and sub- 
tenebrosa, Cryptochiton Stellert and Amicula amiculata, for ex- 
ample, have travelled south from the Sea of Okhotsk; while 
Littorina sinensis and Acanthochites scutiger have come north- 
ward from the Yellow Sea. The great northern species of 
Neptunea and Buccinum and the Velutina family abound and 
flourish towards its northern boundary, while to the south linger 
vestiges of the great tropical families of Cowries, Olives, and. 
Cones. The neutral ground, or place of meeting of north and 
south, seems to be near the Strait of Tsuka, or the south end of’ 
Yesso and the north of Niphon. 
Some genera and species have only been met with hitherto in 
the Sea of Japan, and are possibly peculiar to the Japonian pro- 
vince; at least we must consider them indigenous to this sea 
until they shall have been detected elsewhere. Examples of this 
occur in the genera Zeidora, Cranopsis, Morchia, Cyrilla, and 
