THE FISSUEAL PATTERN. 



501 



Table showing Poub Methods of Enumebatiks the " Aechbd Gtbi." 



LOCATIOH. 



Next the mesal border of the hemisphere 



Between the P. lateralis and the av/persyhi- \ 

 ana and postsylviana ) 



Between the JF. superayhiana and the an- ) 

 terior and postica \ 



Between the F. anterior and postica and the | 

 F. Sylmana j 



Leurct 



(Leuret et 



Gratiolet), 



A, 380. 



Fourth . . 

 Third.. . . 



Second. . 



First . . 



Ferrier, A, 

 145. 



mower, 38, 



479. 



First 



Second.. . 



Third.. . . 



Fourth . . 



Third... 

 Second.. 



r First.. 



Mivart, B, 



Superior. 

 Middle. 



Inferior. 



§ 1364. The Angular Oyrus. — This name is applied to a fold of the hemisphere in 

 man and monkeys. By a few writers it has been given also to the caudal portion of what 

 Leuret called the third arched convolution. As indicated below (§ 1369), we do not think 

 the homologies of the fissures or folds are suflSciently well determined to warrant the 

 application of this name to the Camivora. 



§ 1365. The Fissural Pattern. — The fissures of the cat, dog and fox can be homolo- 

 gized in most respects, yet they differ to such an extent as to be readily distinguishable. 

 If we could accurately determine the arrangement of fissures which is common to all 

 domestic cats and peculiar to them, we might be able to define the fissural pattern of the 

 species. 



In view of the inadequacy of our knowledge, we have thought best to confine the dis- 

 cussion of the fissural pattern to a brief statement of what appear to be the constant and 

 the inconstant fissural characters of Pelts domestiea. 



§ 1366. Constant CJiaracters. — (1) Presence of the following nineteen fissures : anterior, 

 anmta, caMosalis, eoronaZis. cruciata, diagonaMs, flmbrim, hypocampm, lateralis, marginalia, 

 olfactnria, postica, postrhinalis, postsylviana, rhinalis, Syhiana, splenialis, superorbitalis. 



(2) Pissura Sylmana rather short, forming not more than one third nor less than one 

 eighth of an imaginary line coinciding therewith and extending from its ventral end to 

 the dorsal margin of the hemisphere. 



(8) Nine fissures are so placed with reference to the Sylvian as to form three irregular 



arches dorsad of the Sylvian, corresponding with the more regular arched fissures of the 



fox and wolf ; the first consists of the postica and the anterior, the diagonalis often being 



^continuous with the latter ; the second, of the postsylviana and supersyhiana ; the third, 



of the lateralis, with the medilateralis when present, the ansatn and coronalis. 



(4) Absence of a fissure (F. ectolateralis of CanidiE) between the caudal portions of the 

 lateralis and the supersylvian. 



(5) Disconnection of the dorsal ends of the anterior aad postica. 



(6) Independence of the P. olfactoria. 



(7) Independence of the dorsal ends of the anterior, postica, superorhitalis and 8yh>iana ; 

 of the ventral ends of the hypocampm, eoronalis and medilateralis ; of the caudal ends of 

 the splenialis and postradicalis (when present) ; of the lateral end of the cruciata; of the 

 mesal end of the ansata. 



