422 Scientific Intelligence. 
No trace of such a secretion has been detected in the genera Cari- 
naria, Firola, poe or in any of the numerous perforating Aceph- © 
ala, such as the Pholas. 
Oni 
Journal for 1869, p. 280, Prof. C. A. White has published an arti- 
re 
believe “that no doubt is entertained that the posterior portion of 
this mollusk is keenly sensitive to light 
vi of his “Observations on the Genus Unio.” N e 
that Mr. Lea was anticipated, by fourteen or fifteen years, in a few 
lines, by Prof. 8. S. Haldeman, in his “ Fresh-water Univalve Mol- 
lusea,” Phy 
us (Gmelin) to be suddenly withdrawn, when subjected 
le experiment.” The 
the same author, publi in the Iconographic Ency- 
ology, p. 69. (New York, 1850). “The extremity [of 
