Zoölogy. 895 
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thrown off decay while the animal replaces them with new. It., 
THE LEECHES OF Japan.—Dr. Whitman, in the Proceedings of 
the American Academy of Arts and Sciences (Vol. xx, 1884) 
adverted to the poor quality of the work done on the leeches, but 
his Present paper on the leeches of Japan (Quart. Jour, Micros. 
Sct, XXVI, 1886) is certainly not open to criticism as to careful- 
ness and accuracy. It deals with the species of the family Hiru- 
dinidæ, and is illustrated by exquisitely executed colored plates 
Ee) alter drawings by a Japanese artist. Besides this it contains some 
; Morphological notes and observations on habits which are inter- 
+ Sting.. Dr. Whitman shows that on each segment of a leech 
3 there are certain sense organs which are serially homologous with 
the eyes, and which besides are somewhat similar to the latter in | 
Structure, each possessing the same peculiar large clear cells. 
t the function of these segmental sense organs is, remains 
unsettled, but the experiments detailed go to show that they | | 
lave the power of recognizing the differences between light and 
darkness, and that they are not concerned with smell or taste. 
: The similarity of these to the lateral line organs of fishes in thei 
Karly stages is pointed out and the homology of the two sug- 
—-Sested. < 
MyrIAPoD Anaromy.—Mr. C. G. Bourne publishes in the Jour- ;\ 
nal of the Linnean Society a paper on the anatomy of Sphæro- ise 
* 
at is, there is a pair in each of the first three. pedigerous seg- Bo 
Se of the body, and in the remainder there are two pairs in 
Segment. Eac bee 
a S Spiral-walled tracheal tubes take their origin. The author 
Sts that both here and in Peripatus the opening to the tracheal 
-ac should be regarded as the spiracle ahd not the opening from ae 
the sac into the trachea. The paper also has some notes ona _ : 
Cormano of hearing. — | ee 
y 
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