332 THE AMERICAN NATURALIST [Vol. XLII 



found, and one or more have not as yet been identified 

 with certainty. Some additional facts as to distribution 

 and habits are likewise to be reported. (2) Systematic 

 Determinations of Local Ccelenterate Animals, as related 

 to the Biological Survey now in Progress. The survey 

 has brought to light a number of new species of hydroids 

 and medusa^, and a few hitherto quite unrepresented in 

 the fauna of the region. Some account of these may be 

 found in some recent " Notes on the Ccelenterate Fauna 

 of Woods Hole." 7 Others remain to be determined. 

 Dr. Hargitt accompanied many of the dredging expedi- 

 tions made, and thus personally collected most of his 

 specimens in the living state, as they came up in the 

 dredge. Opportunity was thus afforded for obtaining 

 data as to color, etc., which are of much importance in 

 such determinations. (3) The manuscript of the cata- 

 logue of local fauna and flora, so far as this relates to the 

 Coelenterata, was criticized and revised as to nomencla- 

 ture. (4) Some living specimens of the fresh-water 

 medusa, Limnocodium, were received from the Bureau of 

 Fisheries. A brief notice of these has already appeared 

 in Science (November 8, 1907). A fuller account of this 

 most interesting medusa is ready, and will appear in the 

 near future. 



George T. Hargitt, teacher of zoology, Syracuse (N. 

 Y.) High School (now graduate student in Harvard).— 

 Studies of the Embryology of the Hydromedusa. The 

 work on the embryology of the ccelenterates has been 

 most often limited to two phases, viz., the place of origin 

 of the germ cells and development of the medusa or 

 gonophore; and the late cleavage of the egg, with the 

 formation of the germ layers and the development of the 

 planula and polyp. While attention has been so largely 

 confined to the early cleavage and maturation of the egg, 

 the results have been rather unsatisfactory and inconclu- 

 sive, and often conflicting. The work under way is an 



