( 839 ) 



uliicli al (li(^ sanu' linie is llic hrojHlcsl, procivds from llio crus 

 i'liiiiicimi <»r llic coi-piis slrialiim and lornis in Cnhiio lli(> |H'inci|)al 

 mass of this ,i!;aniJ,lion. 'I'lie middle elexation corresponds lo llie ci'iis 

 melai-liinicum of (lie eorinis slrialnm. Il disappeai's willi (lie se|)ai*alion 

 of (lie liemisplier(\s. In (li(> lamina (erminalis i( iiieels (he lioiiiolo,i>-ons 

 opposile prominence. I( is inlerrnpled l»v llu^ anlerior commissure. 

 The most nuMÜal and smallest ele\a(ion only heconies \isihle hefore 

 the lamina (erminalis and is a( (irs( \r\-\ (la( : (hen il rises |)re((y 

 stee[)ly fron(ally hnl rtMiiaiiis narrow, f'rom llie iKniioloii'ons opjiosite 

 elevation il remains separati'd l)y llie shallow median Hoor ^roox'c. 

 Following' the serieus farlluM- in a fronlal direction, the two hemis- 

 |)liei'es S|)li( linally \vi(hiii r(>acli of Ihe median groove of (lic Hoor 

 and (he mos( medial cdexalion coalesces hefore llie foi'amen Monroi 

 with the npper portion of Ihe medial wall, corresponding prelh' 

 accurately to the margo pallii medialis iulernus. 



From this description we must conclude that also this most medial 

 elevation can hy no means he interpreted as the cms epirhinicnm 

 in ?Iis' sense. 



The ojitic thalamus projects in the following sections between the 

 middle and lateral ridge just mentioned. More sharpl}' developed 

 than in preceding stages a longitudinal groove on the outer surface 

 of the thalamencephalon (sulcus fastigialis (lialami) is no\v \isil)le 

 dividing the |)ointed cresi of the optic Ihalamiis from the hroad 

 liasal mass of this ganglion. 



It is situated somewhal higher than llie al»()\e menlioned groo\e 

 ;;, which for the rest is now much less dislincl. P. and »/ ai-e no longer 

 cleai'ly divided. Inslead of lliem \ve lind a liroader groo\e, which 

 doubtless must he designated as sulcus Monroi. 



The hind hi-ain |)i-esenls no peculiarities. 



ReN'iewing the whole of llie |)eculiarities in IIm' dexcdopmcMil of 

 the brain of 'J'arsiiis thai have been noted in IIk^ preceding |)ages, 

 a far-reaching agreement with llie dexclopment of Ihe brain of Ihe 

 primates is obvious. The essential diHerences are sufüciently explained 

 by the rather pronounced niacrosmatic charactei- of the bi-ain of 

 Tarsiiis. It is much more dil'licull lo delermine llie relalioiis of the 

 Tarsius brain in the descending direclion. ( ariii\"ores and Ungulates 

 are out of the (pieslion. The developnienl of llie brain of ('hiro|)lei-a 

 is unfortunately loo little known as y(>( bii( cerlain analogies are 

 certain, \c\-\ great is also tin» agreeuHMil willi (he dev(do|nnen( of 

 lli(3 brain of Kodeiils. only one innsl nol consider \]\c brain of Ihc 

 i-abbil as (he (ypical represenlalivc of (he brain of ivodeuls, as is 

 often done. As the rodent brain iji its turn is not far distant in its 



