Or Say CTF pd 
1878. ] Recent Literature. 383 
The cocoon of P. gloverit differs from that of P. cecropia in 
being perhaps tougher and paler, more glistening in hue, though 
of the same form and size. It it always quite distinguishable 
from that of P. cecropia. The cocoon of P. columbia only differs 
from that of P. gloverii in its smaller size, and the more distinct 
patches of silk material scattered on the outside; it is of the same 
form as in the two other species. 
I am indebted to Mr. J. L. Barfoot for a number of cocoons of 
£. gloverit, from near Salt Lake City, Utah, and to Prof. C. H. 
Fernald and Mr. Anson Allen, of Orono, Maine, for the cocoons 
and imagoes of P. columbia. 
-——10:— 
RECENT LITERATURE. 
Huxtey’s MANUAL oF THE ANATOMY OF INVERTEBRATED ANI- 
MALS.'—The great advances, within the past ten years, in our 
knowledge of the anatomy of animals, renders the appearance of 
this book timely.. No one is better fitted than Prof. Huxley to 
prepare such a manual, which should be authoritative, compact, 
clearly written, and catholic in its treatment. This book, together 
with Siebold’s Anatomy of the Invertebrates, will form a con- 
densed library for the teacher and student. Prof. Huxley has 
made a good innovation on the plan of similar books in intro- 
ducing detailed and more or less illustrated accounts of the 
anatomy of common types of animals, so that with the aid of 
this manual the ordinary student can, in a measure, become his 
own teacher. As a body of well digested facts, clearly and 
_ elegantly stated, this book is without a rival. 
The classification we should find some fault with, as we do 
beginning of the book, and the Echinoderms near the end; the 
worms, crustacea, insects, the Polyzoa, Brachiopods and molluscs 
