REVIEWS. 
COMPARATIVE ANATOMY AND MEDICAL Zo6LoGy.*— As its title pur- 
ports, so do we find its contents. The ‘‘Outlines” are carefully drawn 
and well filled oN, and the student of comparative anatomy will find it 
a hand-book t will be convenient at all times. It is gratifying to 
find so Seaan view of classification as the author here presents. 
He seems to je: i fully the various subdivisions among animals, 
though we disagree with him in his adopting Leuckart’s class Cælenterata. 
It seems to us that Agassiz has never made a clearer point than in his 
A h e of the class value of Polyps and Acalephs, and he (Agas- 
siz) excuses the readiness with which German naturalists acquiesce in 
uckart ingi N 
Teeth, Digestive System, etc., he passes in each case from the lowest to 
the highest animals, mentioning briefly the characters under rani 
possessed by both. us, for example, under Kidneys, we have: ‘* Myri- 
apoda, —Kidney composed of long convoluted tubes,” etc. « Arachnida, 
several coeca empty into intestinal canal,” etc. 
In a work of this character requiring the collation of. so many facts, it 
would not be surprising to find a few mistakes or oversights, and we 
tected. A nervous ganglion has Pte recognized by Fritz Miiller among 
ri i 
has quite conclusively shown, we think, that in the minute nerve termini, 
at the extremity of the upper tentacles of land inoperculate pulmonates 
is seated the sense of smell. It is stated also (evidently a slip of the pen) 
` that fresh-water snails carry their eyes at the tip of the tentacles, whereas 
it is just the reverse, and that marine species carry their eyes at the outer 
base of the tentacles; this is true with several important exceptions. The 
is dimeult to distinguish them apart, but that the presence of the vibrat- 
ing otolites will afford a distinction. Would not another reason be found 
in the external position of one, and the internal position of the other? 

*Outlines of Comparative Anatomy and Medical Zoöl Tein A 
M.D. J. B Lippincott & Co. 19. pp. 190, Svo. a 
) 
