96 
(title unknown) in Papers from the Department of Marine Biology 
of the Carnegie Institution, Vol. 9. p. 71-—-96. There is no reason 
to enter on a discussion of these papers. Only the interesting ex- 
periments by Crozier, proving the unpalatableness of the brightly 
colored Nudibranch Chromodoris zebra should be mentioned. 
Explanation of the Plate I. 
Figures 1, 2, 5 and 6 represent different species probably of the genus Thecla, 
showing a less specialized stage of development of the false head. 
All from the island of Taboga, Panama. 
Fig. 4. Thecla acis Dru., from St. Cruz, West Indies. This is doubtless the 
species, in which I observed this habit of simulating a false head 
in the posterior end during a visit to the West Indies in 1906. A 
notice of the matter is found in ,,Geografisk Tidsskrift" 1908, 
Bd. 19, p. 49. ; 
Fig. 7... Thecla phaleros L. Taboga, Panama. 
Fig. 3, 8 and 9. Thecla battus Cram. Fig. 3 is the female (slightly damaged), 
Fig. 8 the male, and fig. 9 the upper side of the same. All from 
Taboga, Panama. 
Fig. 10. Gynæcia dirce L. Taboga, Panama. 
Figures 11—12, Thecla marsyas L Taboga, Panama. 
172 1OF/. 
