842 General Notes. 
divisions of Trichobranchiata and Phyllobranchiata, with the 
Dendrobranchiata (Penæidea and Sergestide), intercalated. Each 
of these divisions is divided into two sections, the Normalia and 
the Aberrantia. The family Galethewide belongs among the 
Trichobranchiata Aberrantia, while the rest of the old group 
Anomoura form the Aberrantia of the Phyllobranchiate section. 
These groups will form the subject of a report by Professor John 
R. Henderson. 
Recent works upon lacustrine faunas have shown that copepods, 
and especially those of the genus Diaptomus, are bot 
numerous in species and more widely distributed than is generally 
supposed. Most of the ordinary types have been confounded under 
the name of Diaptomus castor, so that until now it has not been 
possible to speak with any approach to certainty of the geographical 
distribution of any species. M.M. de Guerne and Richard have 
now, thanks to the numerous documents they have studied on the 
subject, given a map of the distribution of Diaptomus, and proved 
that it may be regarded as a cosmopolitan genus. 
ENTOMOLOGY. 
ENTOMOLOGY FoR BEGINNERS.—The most important Entomo- 
logical event of the past month is the appearance of an elementary 
text-book by Dr. Packard.2 The following review of this work 
ay prepared by a prominent Entomologist at our request.— 
C. 
comed; and whereyer imperfections may be noticed by the 
critical reader, these should not make him forget that Dr. Packard 
as, in writing this book, given us really the first treatis 
class in the English language. We find after careful reading that 
an astonishing amount of information has been crowded into its 
three Landed odd pages, and that the plan of the work 18 on the 
whole satisfactory. The author has in his preface outlined his 
ideas as to the probable usefulness of the work with sufficient 
1 This oe ae is edited by Prof. J. H. Comstock, Co nell Uni- 
i to 
r 
versity, Ithaca, om communications, books for notice, 
etc., should be sent. 
ee for Beginners, by Dr. A. S. Packard, M.D., Ph.D., 
New York. Henry Holt & Co. 1888. 
