REVIEWS. 363 
serve to be widely read by a class of pa educated ‘‘ species describers " 
p vex good naturalists the world o 
regret that the distinguished uico lip the ces in the 
ier for what radiate feature do the cebas, Foraminifera, 
Sponges and Infusoria possess? are sb Tu ila which 
4p om so ue with the E placed between the Poly- 
à and Brac 
$ 
-. We ar no means satisfied with the author's treatment of the class 
of Insects, comprising in his estimation the subclass Hexapoda and Myri- 
apoda. He consi 
roptera even! Notwithstanding all we know of the Fleas, they are also 
consigned to a separate ** order," though proven to be a family of diptera. 
Arachn placed as a “class” above the insects 
ode of development, their want true metamorphosis (except in 
certain genera of Acarina), their morphology — all convince us that the 
are inferior to the Hexapo nd do not show class characters, any more 
than do the Myriapo s definition of the class the author says 
“ antennæ rudimentary or mandibuliform.” Th æ as proved by 
anatomy and especially embryology (see Claparéde’s great work on th 
p 
embryology of the spiders) do not exist in the Arachnids. The so-called 
antennz are the mandibles. What are the “ tentacles ” in this group, the 
palpi? Of his order Dermophysa, of which we see no necessity, the 
Demodex represents a family of the mites, and the Tardigrades are in all 
probability the types of another and the lowest family of Acarina, while 
the Sea Spiders (Pycnogonids) are traly crustaceous, as proved very sat- 
isfaetorily by the able embryological researches of Dr. Anton Dohrn. 
eer are to our mind ler than the Scorpions and Phrynidz 
cuts are for the most part indifferent, and the printing only dh 
to O 
plainly alluded to could be easily corrected, and a cheap, practical, very 
readable and exceedingly useful manual be produced, and one that would 
deserve a wide circulation. 
AN ' GUIDE. *—This is an excellent little work—one so g 
in faet, that we only wish there were more of it. It is difficult, if not im- 
* The Naturalist’s Guide in collecting and preserving objects of Natural History, with a 
complete list of the Bi p of Eastern Massachusetts. By C. J. Maynard. With Illustrations 
by E.L. Weeks. Boston: Fields, Osgood & Co. 1870. (For sale at the Naturalists’ Agency. 
Postage paid $1.90, : 
* 
