us, and in Rathkca octopniicta and Li.::: id clapLadi 

 may be due to a g;radual process favored bv the thick- 

 ectoderm which may have pre\entetl the tleep-l\ in' 

 from taking an equal share in the formation of tlv 

 finally it has come to remain passive throu,i;houl th 

 formation of the bud, as in B. iiiobc. 



Medusae produced from ectoderm alone ma\ , tl 

 phylogenitally homologous with Medusa; pnxhiceil !• 

 primitive and universal cooperation of both ectodm 



Among the new forms discovered, Parvaiinnits 

 is the most degenerate free-swimming hy{h-oi(l r 

 described. It lacks tentacles, sense organs and per 

 cular system. It swims, however, with great activ 

 short lived. 



Conrlation as the Basis for Selection in Lepidopter: 

 E. Crampton, Columbia University. — Read h\- title. 



Exhibition of a Cat, Shozuing- Abnormal Phiecnicnt 

 CM. Clapp, Mount Holyoke College.— No abstract. 



The Origin and Function of the Medullary Sheath 

 Fibres: Porter E. Sargent, Krowne and Nichols Sc' 

 bridge. — Xo abstract. 



Denumstration of Pulsatile Anterior Lymph Hearts 

 Tadpoles: Henry McE. Knower. Johns 'Ho])kins Cn 

 No abstract. 



Excretory Activities in the \nehi of Castropod 

 O. C. Glaser, Johns Hopkins University. - - The i)ri 

 nary bodies of the larva of L'aseiolaria tulipa attain 



pear-shaped patches of highly \acuolated ectoderm : 

 of the definitive mouth. On account of their onn 



