P22 LOCY, 
Nore. — Since the above article left my hands I have returned to the study 
of the structures described with a large collection of Elasmobranch embryos 
embracing stages which exhibit the early condition of the accessory optic vesicles, 
and also stages that show their later transformations. I have confirmed my 
observations previously made, and, further, I have been able to trace with cer- 
tainty the anterior pair of accessory vesicles into the pineal outgrowth. It is 
therefore necessary to modify my statement above, that the structures are all 
transitory. It thus appears from my later observations that the pineal outgrowth 
arises from two pairs of vesicles that are homologous with those giving rise to the 
lateral eyes. 
Lake Forest UNIVERSITY, 
November 2, 1893. 
