384 - The American Naturalist. 
mesotrochal larva ; possibly it may be compared to a ¢elotrochal la 
but it must be shown that the bands arise in a similar way in 
This is only a tentative suggestion. s 
In Tornaria the arrangement of two longitudinal ciliated bands 
ees throughout with the Asterid larva, as does also its i 
the mature animals, it is difficult to show more than a very di 
genetic SSA a 
As a t of these observations, we believe that the Diple ir 
the hie and lower worms, as well as molluscs. An homologiing 
the circumoral ciliated bands of Echinoderms with the cilia a 
of the other larval types cannot be carried out. 
Asterid and Echinid larva were negative. 
The author speaks of a bilateral fibre-system, united by a cross 
missure, lying in the dorsal skin under the epithelium. It 
tainly more branched. This may be regarded as a well-developed 
mal musculature.—GrorcE W. FIELD. 
PSYCHOLOGY. 
Note on Imperfect Instinct in Animals.—On a num 
occasions I have observed that the instinct of animals is someti 
shown to be imperfect, and reading Mr. George J. Romanes’s bo 
“ Mental Evolution in Animals,’’ where mention is made of w 
fection of instinct ” (page 167), his illustrations quoted recal 
interest of this subject. Regarding insects, on July 4th, 
noticed among the fireworks displayed upon an open stand, 
corner of a vacant lot in Chicago, a number of bunches of ; 
sized fire-crackers with their bright crimson covers Consp 
distributed among the other pieces of similar explosives. 
was standing close by a pretty, bright, reddish-brown 
with silver spots on the under surface of the wings, 
supposed to be the larger species of Argynnis, came flying | 
