Mr. A. Adams on neiv Mollmca from Japan. 299 



I have examined the marginal nerves in the leaves of a ^reat 

 number of Mosses, and iu some instances have seen them ex- 

 tendmg from the very cells of the axis or stem to the point, or 



generally be tound when the border of the leaf is described as 



cartilagmous- or " thickened,- though then- structure, bein<^ 



eTrT/lf " f'r"^ "f'^ prosenchynra, has no relation what° 



tTm. o?if ^' T /'i°^ ''''^^'^'^ "°^' ^° ^^' bryological defini- 



Ti ?7 '^ '""'^ '^°'^ ^"-^^"^"^^ ^^ot tender and succulent/' 



lie followmg extracts from my note-book will render it easy 



lot the bryologist to examnie these nerves, without the aid of a 



drawmg, particularly as the kindness of Mr. Mitten has made 



me sure of the identity of the specie^ 



Atridmm undulatum. Dec. 1859. Very distinct marginal 

 nerves from the stem to the point of the leaf, and -,,'- Si an 

 inch in diameter, the mid-nerve being fully thrice" as large. 



nerrX''''MTr'L'? '^'' '"^ '^^ ^°""^^'^"- ^"«^^^«^^ ^'^ ^^^de 

 near the middle of the nerves. 



Fissidens bnjoides Dec. 3, 1859. Marginal nerves very plain, 

 2 2 86- 01 an inch in diameter, while the mid-nerve is ~l- 



Fissidens taniarindifoUus. Dec. 23, 1859. Marginal' n'erves as 

 dis inct as in 7^. hryoides, and ^J^-, of an mch in diameter, the 

 mid-nerve being ^i^. ' 



Mnium hornum. Jan. 1860. Marginal nerve ^1^ of an inch 

 ni diameter, extending most plainly from the base to the apex 

 ot the leaf, and composed of about three rows of prosenehyma- 

 tous cells remarkably distinct from the contiguous squarish or 

 polyhedral parenchymatous cells of the leaf-blade. 

 _ Bnjum capiUare. Jan. 1860. IMargiual nerves „' of an 

 inch in diameter, scarcely distinguishable from the neighbour- 

 mg cells of the leaf-blade, though portions of the nerve may be 

 sometimes torn off, and it can be traced into the apiculus of the 

 leai. Uiis leat is a fair specimen of a connecting link between 

 the presence and absence of a plain marginal nerve. 



XXXIV.— 0« some New Genera and Species of Mollusca from 

 Japan. By Artuur Adams, F.L.S., &c. 



To the Editors of the Jnnals of Natural History. 



Gentlemen, '^'""^r^A,^'™!?,?); ^°''e^' 



' 5th Dec, 1859. 



• "1? i}l ^''y' ""^ ?'^'' circumnavigation of the Sea of Japan 

 m il.M.b. Action, the dredge was sometimes put in requisi- 

 tion, and, in addition to a better acquaintance with the ftcLra- 

 phical distribution of marine life which was thereby afforded, 



20* 



