8TUDV OF BRAINS OV SIX EMINENT SCIENTISTS AND SCIIOLAKS. 269 



Fissures of the Parietal a)id Occipital Lobes [Lateral Surface), llie Postcentral Fis- 

 sural Complex is an irregular zygal piece whose dorsal arms embrace the caudal limb 

 of the paracentral fissure. An oblique transparietal anastomoses with it while a caudal 

 ramus joins a parietal fissure, the subcentral anastomosing with both. The whole 

 arrangement is quite unusual and complex. There is a well-marked transpostcentral. 

 The parietal itself is short but sends off long rami dorsad and ventrad. The paroccipital 

 is separated from the parietal by an isthmus but its cephalic stipe joins the occipital. 

 The paroccipital is of the usual zygal form with long curved stipes. 



Mesal Surface. — The j^recuneal fissure is exceedingly complex and anastomoses 

 with both the paracentral and the occipito-calcarine stem. (The cuneal fissures 

 cannot be described owing to the destruction of the part.) 



Gyres of the Parietal and Occipital Lobes [Lateral Surface). — The postcentral gyre 

 is of good width and marked by numerous fissural rami and independent pieces. 

 The parietal gyre presents intricate fissure-markings. The marginal and angular gyres 

 are exceedingly well developed but less so than the corresponding areas on the right side. 



3Iesal Surface. — The intricate markings of the precuneus have already been 

 alluded to. (The cuneus cannot be described owing to destruction of the part.) 



Fissures of the Temporal Lobe (Latero-venfral Surface. — The supertemporal fissure 

 is represented by two short cephalic segments while the caudal piece, 9.5 cm. in 

 length, anastomoses with the subcentral-parietal junction over a vadum. The medi- 

 temporal is represented by several segments rich in transverse anastomoses. The 

 remaining fissures of the temporal lobe cannot be described owing to the destruction 

 of the parts. 



Gyres of the Teiaporat Lobe. — The supertemporal gyre is well defined, fairly 



sinuous and traversed by an arm of the second supertemporal fissural segment. The 



remaining gyres, so far as they can be examined, present a very complex and tortuous 



configuration. 



Right Hemic erebrum. 



Tlic Interlobar Fissures. The Sylvian Fissure aiid. its Rami. — The sylvian fissure 

 is 5.9 cm. in length, its course is moderately sinuous and the sylvian angle is 26°. 

 Its depths are as follow^s : Pre-sylvian, 16 ram. ; medi-sylvian, 21 mm. ; post-sylvian, 

 25 mm. The presylvian fissure is short, while the subsylvian attains a length of 2.5 

 cm. The episylvian ramus joins the subcentral fissure. The hyposylvian is short. 



'ihe central fssure is 10 cm. in length and its course is less sinuous than that of 

 the left side. 



The occipital and calcarine fissures could not be thoroughly examined, owing to 

 the extensive loss of the occipital portions of the l)rain. 



A. P. S.-XXI. HH. 4, 11, '07. 



