1887] Zoology. 1121 
the three cords of cells already mentioned, as well as the formation 
_ of the nerve-fibres and the inner and outer medulla. Besides 
this, he gives, but with less detail, the history of the retinal— 
= or, to use the term with his significance, ommatidial—elements. 
In their history he agrees well with Dr. Kingsley. 
= Dr. Patten’s paper contains a number of other observations. 
_ He shows that the median ocellus of Vespa arises as two ocelli, 
_ Closes with some observations on the eyes of Phalangium. 
7 “seal for September, 1887, has a “ Note on a New Type of 
9 m 
interpretation of Carriere’s eye of Nereis. The author incident- 
ally makes some corrections of his former account of the eye of 
Serolis, in the Report of the “ Challenger” Expedition. — 
_Itmay be stated, in conclusion, that American students promise 
to increase the literature of the arthropod eye to a considerable 
ER as work oe now being conducted AKIA = po peers 
ureOrpions, heus, marus, and Trilobites, and po: 
on 
