50 



SCIENCE. 



The lines represent what may be called thtjissural 

 integers, and only those junctions are shown which, 

 so far as I know, are constant in the cat. These are 

 of the rhinal with the postrhinal. and of the sylvian 

 with the point of their union ; of the superorbital with 

 the rhinal ; of the callosal with the hippocampal, and 

 with the preradical when it exists. 



The following junctions I have never observed : Of 

 the splenial with the postrhinal ; of the splenial with 

 the cruciate, which Guillot has seen once, and Krueg 

 twice. Neither have I seen the union of the anterior 

 and posterior fissures to form the " first or lowest 

 arched fissure " of the Canidae. On the contrary, as 

 stated by Krueg (2.613), an d by myself (11,229), 

 this union sometimes fails with domestic dogs ; hence, 

 in this as in many other respects, the cat presents 

 less tendency to vary. 



The following junctions are common : Of the 

 diagonal with the anterior ; of the postsylvian with the 

 supersylvian ; of the medilateral with the lunate, and. 

 with the lateral or the confinis ; of the marginal with 

 the post marginal ; and of the ansate with the lateral 

 or coronal or both. 



A junction is usually marked by a less depth of the 



compound fissure at that point, constituting a con- 

 cealed "transition convolution" or " pli de passage," 

 which may be seen by separating the sides or by 

 slicing off the cortex. 



The fissura ansata is represented by me as a slightly 

 curved line nearly at right angles with the lateral and 

 coronal, and rather nearer the former. It is true, as 

 stated by Krueg, that the apparent form of the fissure 

 is usually triradiate ; but the variations are so great 

 that no single figure would fairly represent them all, 

 and in two brains I have found the condition of things 

 shown in the figure. This fissure demands fuller in- 

 vestigation, especially with reference to its representa- 

 tion in the human brain. 



The sylvian fissure in the cat does not present the 

 complexity observed by Krueg in some dogs and in 

 Ungulata, and the " Insula" is not distinguishable. 



My paper will contain a synonymy of the fissures of 

 the cat's brain, with full references to the page and 

 figure upon which a fissure is named or represented. 

 In some cases there are 25 entries under a single 

 head, and I trust the lists may aid others in the identi- 

 fication of the fissures as described by different 

 authors. 



ABRIDGED SYNONYMY OF THE CEREBRAL FISSURES OF THE DOMESTIC CAT. 



Ar.BREV. 



Flower, 1869. 

 Leuret, 1839. 

 Huxley \ 1861, 1872. 



An , 



A. 



C. . 

 Cf. 



c>. 



Cr 

 Di. 



1-1. 

 H. . 



Crucial. 



Hippocampal. Den- 

 tate, H., 1861. . . . 



I. .. 



Ml. 

 Mr. 



01. 



Per. 



1'... 



I'mr. 

 I Yd . 

 Pr... 

 Ps... 



1'rrd. 

 R. .. 



Sfl .. 

 Sp... 



So. 

 Ss. 



s.. 



In. 



Callosomarginalis, 



(Fl. & H). 

 Supraorbital, (Fl). 



Sylvian. 



Owen, 1868. 



Wilder, 1873. 



Ant. branch of ectosyl- 



vian Ant. upright of ectosylvian. 



Callosal 



Part of medilateral Part ot medilateral 



Coronal Coronal 



Frontal Frontal 



Part of falcial. 



Hippocampal. 

 Lateral 



Part of medilateral . 

 Marginal 



Lateral 



Part ot medilateral. 

 Ectorhinal 



Post, branch of ectosy.'- 

 vian Post, upright of ectosylvian. 



Part of ectorhinal. 

 Postsylvian 



Part of ectorhinal. 

 Part of falcial 



Supercallosal 



Part of rhinal 



Part of supersylvian. 



Part of rhinal. 



Supers-, h lan 

 S\ Iviat) 



Presylvian 



Postsylvian & supersylvian. 

 Sylvian 



Krueg, iS 



Ansa'a 



Anterior. 



Confinis. . . 

 Coronalis . 

 Cruciata . . 

 Diagonalis 

 Genuahs. . . 



Hippocampi. 

 Lateralis 



Medilateralis.. . 

 Suprasplenialis 



Olfactoria 



Postcruciata . . . 



Postica 



Postsplenialis. 



Rhinalis post. .. 

 Suprasylvii post. 



Rhinalis. 

 Rostralis 



Splenialis. . 



Prassylvii .. 

 Suprasylvii 

 S\ Ivii 



Adopted in the p 



resent 



paper. 







An. 



Anterior 



A. 



Callosalis 



C. 



Confinis 



Cf. 



Coronalis 



Co. 



Cruciata 



Cr. 



Diagonalis 



Di. 





Fl. 



Hippocampalis. 



H. 



Lateralis 



L. 



Lunata 



Lu. 



Medilateralis. . . 



Ml. 



Marginalis 



Mr. 



Olfactoria 



01. 



Postcruciata . . . 



Per. 



Postica 



P. 



Postmarginahs. 

 Postradicalis. . . 

 Postrhinalis.. . . 

 Postsylviana. . . 

 Preradicalis.. . . 



Rhinalis 



Subfalcialis .... 

 Splenialis 



Superorbitalis. . 

 Supers) lviana. . 



Sylviana 



Intermedia 



Pmr. 



Prd. 



Pr. 



Ps. 



Pnd. 



R. 



Sfl. 



Sp. 



So. 



Ss. 



S. 

 In. 



The foregoing is an abridgement of this synonomy 

 limited to writers who have made special additions to 

 the technical nomenclature, and excluding those who 

 have employed phrases or vernacular names, or who 

 have adopted the names of other writers in purely 

 physiological papers. Notwithstanding the impor- 

 tance of the contributions of Flower, Huxley and 

 Leuret, the technical names employed by them are so 



few that they may be given in a single column. It is 

 due to Krueg to state that several of the names now 



given had been already used in his paper on the Un- 

 gulata, in which he included a diagram of a dog's 

 brain. 



The principles of anatomical nomenclature are 

 hardly identical with those of taxonomy, but it seems 

 right that priority should prevail excepting when the 

 name implies an incorrect or doubtful homology, or 

 is practically very objectionable. Hence, Owen's 

 "Postsylvian" should not be displaced by Krueg's 

 "Suprasylvi posterior," or his "marginal," by "su- 



