Edward Anthony Spitzka 37 
The paracentral gyre is about 4 em. in length, its dorsal margin is in- 
dented by the central, the inflected, and by an intraparacentral piece which 
joins the paracentral over a vadum. 
The orbital surface is very much fissured, rather more so than on the 
right side; the mesorbital gyre is narrow, the postorbital quite distinct. 
FISSURES OF THE PARIETAL AND OCCIPITAL LOBES (LATERAL SURFACE).— 
(For the sake of convenience and clearness, the features of the parietal 
and occipital lobes are described together.) 
+ 
The Postcentral Fissural Compler.—The postcentral fissural complex, com- 
prised of the postcentral and subcentral segments in this instance, is a 
continuous fissure, and anastomoses with the sylvian fissure ventrally, 
and with the parietal fissure caudally. The main portion of the post- 
central describes an angular course more or less parallel with the central, 
its dorsal end bifureating to embrace the caudal limb of the paracentral. 
The whole course of the fissure so much resembles a duplication * of the 
eentral fissure, that only a careful study of its relations to the other 
fissures in its neighborhood can settle all doubts. 
The transpostcentral is independent. 
The parietal fissure springs from the postcentral over a deep vadum, 
passes caudad in an angular course, anastomosing with the intermedial, 
a transparietal and the paroccipital. The transparietal is a long fissure 
which crosses the dorsi-mesal margin to anastomose with what possibly 
represents Wilder’s adoccipital. 
The paroccipital presents the usual zygal shape, with the stem curved 
laterad. Its cephalic ramus joins the parietal over a deep vadum, The 
caudal ramus is unusually long (27 mm.). 
The intermedial fissure is of zygal type, and joins both the episylvian 
and the parietal. By these anastomoses there exists a confluent series of 
fissures by means of which one may trace a course from the sylvian to 
the paroccipital in two ways: one by way of the subcentral-parietal anas- 
tomosis, the other by the episylvian-intermedial-parietal. 
The complex of fissures in the angular and post-parietal gyres is diffi- 
cult to describe. One prominent fissure (called by Schafer (in Quain’s 
Anatomy) the ‘ ascending second temporal,’ but whose origin is probably 
traceable to the primitive exoccipital) is confluent cephalad with the super- 
temporal just where the latter changes its course in the dorsal direction. 
Its situation is not unlike that in the other Eskimo brains, particularly 
that of *‘ Nooktah,” and the right half of “ Kishu.” <A tri-radiate fissure, 
doubtless an exoccipital segment (Figure 1, EOP) curves around the caudal 
ramus of the paroccipital, and is separated from the postealearine by a 
narrow gyre. 
MESIAL SURFACE.—The precuneal fissure is a zygon, not confluent with 
any other fissure. Further dorsad there is a fissure joining the occipital, 
which traverses the dorsi-mesal margin, previously alluded to as a pos- 
sible adoccipital. 
*A similar condition misled Sperino in his description of the brain of the Anato- 
mist Giacomini. See the author’s paper, Phila. Med. Jour., August 24, 1901. 
