EMBRYOLOGICAL. 
Gen. Sub. 47 
Mesoderm and coelome ; Pol^jaeff (402). 
Organ-forming areas ; Barfurtii (25). 
Blood, &c., origin of ; Nusbaum (378, 379). 
Origin of blood- corpuscles ; Engel (152). 
Blood and vascular endothelial are wholly hypoblastic ; Hoffmann 
(248, 250). 
The Urmund theory ; Davidoff (123). 
Ectodermic origin of skeleton : Ectodermic proliferations give rise to 
skeletal rudiments of a connective-tissue nature, which are subsequently 
in part differentiated into cartilage ; Goronowitsch (196). 
Nervous system, development of ; summary and criticism; Strasser 
(494). 
Chondrocranium and arches, development of ; Gaupp (178). 
Head, development of the ; Kupffer (304). 
Ectodermic origin of some cartilaginous structures in the head; Platt 
(401). 
Hairs and skin sense-organs ; Leydig (314). 
Vertebrate embryology ; Marshall (340). 
Bibliography of vertebrate embryology ; Minot (349). 
Gastrulation in Vertebrata and homology of germinal layers ; Repia- 
choff (417). 
Germinal layers in Vertebrates : A palingenetic invagination (inAmpfo- 
oxus ) forms the archenteron ; a coenogenetic dorsal invagination of 
ectoderm forms, according to the author, the rudiment of notochord and 
associated musculature, along with which the rudiment of the nervous 
system is also associated ; Lwoff (327). 
Import of intracellular bridges between smooth muscle and epithelial 
cells in outer germinal epithelium ; Heidenhain (225). 
Wolffian body, development of, in chick and rabbit. The duct and seg- 
mental tubules are at first solid. No evidence that the tubules form first 
and then join the duct ; Haycraft (220). 
Ganglion-ridges (Ganglienleisten) in head of birds, &c. The medullary 
plate is a composite rudiment (Anlage) ; the primary ridges form mesen- 
chyme ; in the formation of the secondary ridges the ectoderm and the 
medullary plate have an equal share ; but the most general conclusion 
seems to be the impossibility of drawing any strict line between ecto- 
dermic and mesodermic origins ; Goronowitsch (195). 
Development of reptiles ; Will (549). 
Parablast and the circulatory system in Axolotl, development and 
morphology of the ; Houssay (254). 
Pineal eye, epiphysis, and parietal nerve, development of ; Klinckow- 
strOm (282). — Origin of hypophysis ; Gaupp (179). 
Origin of nerves, organs of lateral line, &c.,in Selachii ; Mitrophanow 
(351). 
The epiphysis in tSqualus is double, being formed from a united pair of 
accessory optic vesicles ; Locy (317). 
A complete vascular system formed without circulation or blood- 
1893 . [VOL. XXX.] B 7 
