MICR 0 S COPY, &c., OF UURRENT RESEARCHES BELATINQ TO (principally Invertebrata and Cryptogamia), INCLUDING ORIGINAL COXXUNICATIONS FROM FELLOWS AND OTHERS? ZOOLOGY. A. GENERAL, including Embryology and Histology of the Vertebrata. Development of the Ovum of Arvicola arva1is.t-The following are the chief points of C. Eupffer's investigation into the alleged reverEal of the positions of the germ-layers in certain Rodents.