REVIEWS AND BOOK NOTICES. 635 
The author takes the opportunity of correcting Huxley’s hasty 
o NA respecting the absence of basipterygoids in Procel- 
æ-an error which, however, had been already exposed.* 
Méhough these processes are absent in Diomedea and rudimentary 
in “ Thalassidroma,” they are well developed in other genera; and 
the fact is, that basipterygoids are highly characteristic of the 
Procellariide.— ELLIOTT Cours 
GUIDE To THE Srupy or Insects.t— A third and revised edition 
of this work has appeared with a few changes and additions 
of considerable importance. The author calls attention to the 
change in his views as to the number of segments in the head of 
six-footed insects; there being four instead of seven. A brief 
account of the recent discovery of Parthenogenesis in the pupa 
of a Chironomus is given ; and also of wax-secreting glands lately 
found in wax-producing insects, 7. e., the bees, aphides and bark 
lice (Coccide). Moreover a correct figure of the caterpillar and 
chrysalis of Melitea Harrisii, takes the place of the incorrect 
representation in the first two editions, while a short notice of 
e worm-like mites, Linguatulina, is inserted. 
The Appendix consists of illustrated notices of the early stages 
of certain ichneumon parasites ; of the embryonal membranes of in- 
sects ; of the development of the louse : the mode of formation of the 
Wings of insects ; of Paolia, a remarkable fossil carboniferous insect 
and of abdominal sense organs of certain insects, while sketches 
of Schiédte’s new classification of the Hemiptera, and Thorell’s 
arrangement of the spiders are presented. Two plates are added, 
Uustrating injurious and beneficial insects. Two other steel 
plates, one of lice, the other of Thysanura are added, and several 
_ new species of insects referred to. 
Tue Desmips.{ Microscopists will welcome this beautiful 
memoir on the desmids of Sweden. It will be invaluable to 
erican observers, as there is so much similarity between the 
*By = Som ESTREETS. Proc. Phila. Acad., 1870, 85. 
o the Study of hiisak and a Treatise on those injurious and peneficial to 
Crops: for the use of Colleges, Farm-Schools, and Agriculturists. By A.S. Packard, 
Ts Poe With 15 plates and 670 woodcuts. Third edition. Salem, 1872. 8vo. pp. 
midiaceis, pai in Suecia invente sunt. Observationes critice. Auctore 
tDe 
P. M. regan Cum tabulis V, pp. 100. Nova Acta of the Royal Society of Sciences of 
== 
