Edward Anthony Spitzka 53 
question whether the tri-radiate piece at the dorsi-mesal margin repre- 
sents the inflected. It were the first instance in the author’s experience 
(based on studies especially directed to the inflected fissure in over a 
hundred brains) that the inflected were other than a simple fissure. 
The frontomarginal is represented by two segments, both running par- 
allel to the supereallosal, the longer segment joining the latter just 
ventrad of the splenium. 
The rostral fissure is 5.5 em. in length, while the subrostral is only 
slightly indicated. ¢ 
Owing to the narrowness and comparative insignificance of the mesor- 
bital gyre in this hemicerebrum, the olfactory fissure becomes visible on 
the mesial aspect for 2 cm. 
THe ORBITAL SURFACE.—Two principal, sagittally-directed orbital fis- 
sures, and several smaller segments mark the orbital surface. The 
olfactory fissure is 5 em. in length. 
GYRES OF THE FRONTAL LOBE (LATERAL SURFACE).—The precentral gyre 
is of unusual breadth and is very tortuous. Its surface area is fully twice 
as great as that of the precentral. 
The superfrontal gyre is of good width, except near the frontal pole, 
where the gyre tapers perceptibly and becomes very narrow. One of the 
paramesial pieces serves to divide a portion of the gyre into two tiers. 
Further cephalad the gyre is marked by many transverse segments and 
incisures. 
The medifrontal gyre is particularly massive and of a superior com- 
plexity. It is notable for its distinct and long medifrontal fissure. 
The subfrontal gyre is smaller than its fellow on the left side and in 
its configuration much less developed. 
MestaL SuRFACE.—The mesial surface of the superfrontal gyre, while 
well supplied with fissures is a trifle less so than on the left side. 
The limits of the paracentral, depending upon the identification of the 
paracentral rami must remain a matter of doubt for the present at least. 
ORBITAL SurRFACE.—The mesorbital gyre is unusually narrow in this 
ease. The remaining gyres may be resolved into three principal portions, 
sagittally directed, without any demarcated postorbital gyre. 
FISSURES OF THE PARIETAL AND OCCIPITAL LOBES (LATERAL SURFACE).— 
The Postcentral Fissural Compler.—The combined postcentral-subcentral at- 
tains a length of 7.5 em., is bifureated dorsally, to embrace the caudal 
paracentral limb, and anastomosing ventrally with the episylvian over a 
slight vadum. From it spring two cephalic and three caudal rami. The 
transpostcentral springing from the sylvian, is otherwise an independent 
fissure. 
The parietal is separated from the postcentral, and is confluent with 
the paroccipital. Five rami spring from it. There is a well-marked trans- 
parietal. The intermedial fissure is small. The paroccipital is a very 
irregular zygal fissure, confluent with the parietal by its cephalic ramus. 
The cephalic stipe is bifureal. The caudal stipe anastomoses with “the 
posteuneal, 
Of the exoccipital complex there may be made out one extensive seg- 
