192 
GRIMMIA HARTMANI, Schp.. 
AN ADDITION TO THE YORKSHIRE MOSS FLORA. 
CHRIS, A. CHEETHAM. 
ON the occasion of the recent Bryological meeting in Crummock. 
Dale, a moss was gathered which agreed with the description 
of the above in all but general colour, it has since been submitted 
to Mr. H. N. Dixon, F.L.S., who has kindly verified ithe 
identification. : 
A subsequent visit shows the moss to be fairly plentiful, 
and suggests that it may have been overlooked as Rhacomitrium 
heterostichum with which it is associated ; the colour is similar, 
green above, black below, but it lacks the usual hoary appear- 
ance of Fk. heterostichum owing to the very short hyaline points, 
and it is more compact and neater in growth. The habitat 
is on scattered siliceous boulders, not in streams nor where 
likely to be submerged at any time, the situation is sub-alpine 
as is shown by the Andrezeas, etc., in the vicinity, although the 
altitude is only 750 feet above O.D. 
-O; 
Ancient Hunters and their Modern Representatives. By W. J. Sollas, 
Macmillan & Co., 591 pages, 15s. net. The fact that this volume has 
reached its second edition within four years, speaks well for its popularity. 
In the present edition many changes and amplifications, etc., have been 
made as a result of recent research ; in fact, the amount of new information 
that has been obtained with regard to primitive man in recent years. is 
extraordinary. 
Text-Book of Embryology. Volume i., Invertebrata. By Professor 
E. W. MacBride. Pp. xxxii+692. London: Messrs. Macmillan & Co- 
Price, 25s. net. Since the publication of Balfour’s work on Comparative 
Embryology in 1880, many additions have been made to our knowledge 
of this intensely interesting branch of zoology. The need of a work 
putting forward concisely the results of recent research in animal develop- 
ment has for some time been urgent. This is now met, as far as the 
Invertebrata are concerned, by the publication of Professor MacBride’s 
handsome text-book. Its arrangement is a distinct improvement on the 
earlier work of Balfour and contains some quite new and useful features. 
The plan followed is to describe a number of typical life-histories, illustrat- 
ing all the important groups of Invertebrata, selecting types which have 
been fully worked out, and as far as possible, such as are easily accessible to 
students in temperate regions. Thus the spider has been chosen as a type 
of the Arachnida rather than the more generalised scorpion. A general 
account of the development of other members of the group follows the 
description of the type. In indicating some of the problems in the field 
of embryology which still remain to be solved, and also in giving an account 
of the methods of microscopical technique used by the best investigators, 
the book will prove invaluable to students. It contains nearly five hundred 
illustrations, and is provided with a copious index and bibliographies of 
the more important works referred to. It is printed and got up in that 
excellent way of which Messrs, Macmillans’ name is the hall-mark, and the 
volume should certainly be acquired by every public and scientific society’s 
library. ee 
Naturalist, : 
