368 MANTON COPELAND 
tially normal, the other somewhat distorted, a condition of the 
olfactory apparatus which might well allow stimulation of suffi- 
cient strength to call forth a response as described above; one 
weak in character, in which discrimination between the two pack- 
ets was less marked than normally. 
The tests here recorded show that the puffer approaches and 
bites a packet containing concealed food many more times than 
it does one filled with cheese cloth; secondly, that these reac- 
tions cease when the olfactory apparatus is rendered inoperative 
(although pieces of meat are eagerly taken when seen) and, thirdly, 
that the ability to discriminate between the two packets is re- 
gained when the olfactory apparatus again becomes functional. 
I, therefore, conclude that Spheroides maculatus responds to a 
stimulation of its olfactory apparatus by substances in dilute 
solution emanating from concealed dogfish meat, and, that it 
discovers hidden food by the sense of smell. 
BIBLIOGRAPHY 
Parker, G. H. 1910 Olfactory reactions in fishes. Jour. Exp. Zodl., vol. 8, 
pp. 535-542. 
1911 The olfactory reactions of the common killifish, Fundulus hetero- 
clitus (Linn.). Jour. Exp. Zoél., vol. 10, pp. 1-5. 
SuEetpon, R. E. 1911 The sense of smell in selachians. Jour. Exp. Zodl., vol. 
10, pp. 51-62. 
