640 General Ne tes. | June, 
pubic cartilage of Lacertilia and with the marsupial bones of the 
Mammalia, and believes to be homodynamic with the episternum 
(Wiedersheim) of the Anura and the pair of substernal bones 
found at the anterior extremity of the sternum of some mammals, 
and even in man. These elements are, therefore, styled by M. 
Albrecht pre-omosternum and pre-pelvisternum respectively. The 
element existing behind the pelvisternum in the Lacertilia is simi- 
larly styled post-pelvisternum, while the xiphisternum of the Anun 
is the fost-omosternum. These parts are considered by M. Al- 
brecht to be formed by the ventral parts of the limb bones, and 
thus are not homologous with any part of the costosternum, which 
is composed of copulz that link together the ribs. 
The pelvisternum of the Mammalia had been noticed by twoor 
three authors prior to M. Albrecht’s paper. 
ScaLes, FEATHERS AND Hairs.—The idea current among 
of Natural History. Mr. Jeffries considers 
Pe : s formed long before the 
smooth mucous layer, an epitrichial layer, an 
mediate layer of parenchymatous cells. In 
sides of the toes of many birds. Scuta bear page a toh bave 
appendages—scales never do, thus pointing to nm ` nal core, 
a mucous layer and outer horn coat with a me 
ir differ. 
the preter a 
epiderm of a large papilla. A hair does not ae : 
mucous cells, while a considerable portion a + hers aod scales 
of them. The supposed homology between i uyat absenti 
seems to fail before the facts that the ed eike 
the latter, and that Studer has shown laci : Me J eis aro 
i f uins is a fa . $ theo 
nature of the remiges of peng f the dermal l appe Fie At 
higher vertebrates, and asserts that the pean of any of the | 
phibia is a strong argument against the 1 
mmiais- 
avian appendages with those of reptiles oF mamm 
