56 
NEW DIATOMS. 
the margin of the connecting zone, which is of variable breadth, 
nodules at the end quite small. Median line strongly and sharply 
inflected and minutely punctate along its whole lengtb, an irregular 
row of minute lines or elongated dots on the valve within the 
margin. In s. v. dorsum very convex; ventral margin straight, 
or nearly so, with slight constriction at the ends ; central nodule 
indistinctly shown (out of focus). Strise excessively minute. 
Length -0026 ; breadth *0012 to -002. 
Atlantic marshes, N. J. (Dr. Lewis). 
Actinocyclus Niagaree. H. L. S. 
Disc large, diam. '0038, valves very much inflated, and densely 
packed with minute radiating punctae, which are scattered loosely 
and irregularly at the centre, and sometimes radiate from two 
central blank spaces. In the living form the connecting membrane 
is broad, and the highly inflated valves cause it to lie obliquely. 
There is a characteristic circlet of minute spines within the margin 
of the valves, and the subulate blank spaces, so characteristic of 
A. Ra/fsii , are more or less apparent. 
Lake Erie (H. C. Gaylord). 
The above species are illustrated on one plate, in the Journal 
from which the above descriptions are derived. 
CLAVIS HYMENOMYCETUM. 
For obvious reasons we shall content ourselves with an announce- 
ment of the appearance of this work under the title of “ Clavis 
Synoptica Hymenomycetum Europaeorum,” the joint authors being 
the editor of this Journal, and Dr. Quelet. It is clearly, neatly, 
and compactly printed in a pocket volume for field work. Inter- 
leaved copies for notes are being prepared at a slight additional 
cost. 
The arrangement to a great extent follows that of Fries' last 
work, including all the European species since described, with 
short characters of each species, just sufficient for the field, in 
Latin, so as to be available for all European countries. A dis- 
tinctive mark indicates the British species. Wherever a species 
has been accurately figured, reference to that figure is given. 
Some few new species are published for the first time, chiefly from 
the Vosges. 
It was considered advisable not to initiate any considerable 
departures from the “ Monographia ” of Fries, since no explana- 
tion or reasons could be given within the scope of the work. 
Nevertheless, in thejudgment of the authors, some of the species 
recorded in that work have been considered as entitled to rank only 
as varieties ; and, in other instances, species placed by error in 
wrong genera, or subgenera, are transferred to the company of 
their nearest allies. The work may be obtained in the chief capitals 
of Europe, or direct from the publishers. 
