1138 Editors’ Table. [ November, 
Fig. 19, represents an embryo of a stage similar to ours, where 
the postoral or fourth (labial) segment is quite separate from the 
rest of the head. The accompanying figure, copied from our 
memoir, also shows in a saw-fly larva (Ne 
matus ventricosus) the relations of the 
labial or fourth segment to the rest of the 
head. The suture between the labial seg- 
ment and the pre-oral part of the head 
disappears in adult life. From this sketch 
it would seem that the back part of the 
head, 7. e., of the epicranium, may be made 
Head of embryo Nema- up in part of the tergite or pleurites ofthe 
tus, showing the labial seg- ‘ : di as 
ment, occ, forming the occi- mandibular segment, since the man 4 
mr oS pda MD, wr muscles are inserted on the roof of the d 
muscle of ikai 7 wo Retains head behind the eyes. It is this segment 
oe ee. (la- which in Corydalus evidently forms the 
Faget ats occiput, and of which in most other 1- 
sects there is no trace in larval or adult life. , 
It appears, then, that the epicranium, or that piece (sclerite) A 
bearing the eyes, ocelli and antennæ and in front the clypeus E 
labrum, is formed from the original procephalic lobes, and repre 
sents the first or antennal segment, and is pleural, the clypeusand 
labrum being the tergal portion of the segment , ja 
remainder of the original or primitive segments are obsolete, 
cept in those insects which retain traces of an occiput or fourth : 
é head probably 
cephalic tergite. All of the gular region of th 
represents the base of the primitive second maxillæ. 
10: 
EDITORS’ TABLE. 
EDITORS: A. S. PACKARD, JR., AND E D. COPE. : l 
autopsy has presented reports E 
to the Anthrop™ 
The society of mutual 
the brains of several of its deceased members P 
logical Society of Paris. These reports are of great 1 of the 
being among the very few accounts which we pos ai 
structure of the brain in persons whose characters are #4 
the investigators. It is clearly the only means of 3 af 
foundations for a true physiology of the thinking Pte 
brain, which we possess. Unfortunately we are OFF i 
threshold of the subject, owing to the almost absolute B® 
