1861.] BRAIN OF ATELES PANISCUS. 253 



anatomists as the 'Eminentia collateralis,' for an authoritative defi- 

 nition of which I will again quote Soemmering's Anatomy, " Die 

 seitliche Erhabenheit oder die langliche Seitenerhabenheit oder die 

 Nebenerhabenheit (emi?ientia lateralis, s. collateralis, s. Meckelii), 

 bildet eine wulstige Hervorragung welche vor dem Eingange in das 

 hintere and neben dem in das untere Horn des Seitenventrikels liegt, 

 und nach aussen von dem Ammonshorne sich befindet. Uebrigens 

 wird diese Benennung offenbar auf verschiedene, variabele, grossere 

 oder unbedeutendere, Erhabenheiten, die neben dem Ammonshorne, 

 in dem Bereiche des unteren Homes des Seitenventrikels vorkommen, 

 angewendet." 



" The eminentia lateralis, or collateralis, or Meckelii, is formed by 

 a rounded elevation which lies in front of the entrance into the poste- 

 rior, and beside that into the inferior cornu of the lateral ventricle, 

 and is situated external to the cornu Ammonis." 



It will be observed that Valentin, who has taken great care to col- 

 lect together the multitudinous synonyms of the parts of the brain, 

 does not enumerate " pes hippocampi minoris " among those of the 

 eminentia collateralis ; nor has the term ' pes hippocampi minoris ' 

 been ever used in this sense by any anthropotomist of authority. 



And if it be an error iu terminology to apply the name of pes ' hip- 

 pocampi minoris' to the eminentia collaterahs, it is a still greater error, 

 in point of anatomical fact, to assert that " the eminence continued 

 backwards from the pes into the posterior cornu is the hippocampus 

 minor*." If any eminence is continued backwards from the emi- 

 nentia collateralis into the posterior cornu (as sometimes happens) it 

 lies in the floor of the cornu, alongside the hippocampus minor, but 

 perfectly distinct from it. But it will perhaps be better to demon- 

 strate this elementary fact over again, though I feel that the doing 

 so necessitates an apology to those who are conversant with the ana- 

 tomy of the human brain f. 



The lower figure of the woodcut (fig. 2) represents the inner sur- 

 face of one of the hemispheres of the human brain. The contour 

 is taken from oue of Foville's Plates, but only the principal sulci 

 are indicated, — those marked /, m, and n being put in from a speci- 

 men which I dissected, so as to ascertain their true nature. Of these 

 sulci, that marked i i is the sulcus called by Gratiolet ' fronto-parie- 

 tal,' a name which involves an ambiguity, and for which I therefore 

 propose to substitute ' calloso-marginal,' as this sulcus hes between 

 the corpus callosum and the margin of the hemisphere ; k is the oc- 

 cipito-parietal sulcus (scissure perpendiculaire interne, Gratiolet) ; I 

 is the posterior part of the " scissure des hippocampes " of Gratiolet. 

 This sulcus is a very remarkable one. Commencing just in front of 



* Prof. Owen, Athenaeum, March 23rd, 1861. 



•f Compare, lor example, the well-known standard English ' Elements of Ana- 

 tomy,' hy Quain and J^harpey, where the relations of the eminentia collateralis and 

 hippocampus minor to distinct convolutions are clearly pointed out (p. 710). 

 Maiacarne (Encefalotomia Nuova, 1780, part ii. p. 67) describes the continuatioa 

 of the eminentia collateralis forwards into the descending cornu under the fanci- 

 ful name of " Gamberuolo," or greave. It appears to be more constantly of large 

 size than the continuation backward into the posterior cornu. 



