OF THE CEEEBETJM OF THE QTJADEUMANA. 
199 
1. That the posterior lobes, whether we understand by the term that portion of the 
cerebrum which hes over the cerebellum, or, taking our definition from internal struc- 
ture, that part which is situated behind the hippocampus major, exist in all the Qua- 
drumana, and are characterized in all by the presence of a deep longitudinal sulcus 
(calcarine) on their inner surface. 
2. That the length of this part of the brain, in relation to that of the antero-median 
portion, varies in different members of the series, but is greater in many of the Apes 
than it is in Man, and attains its maximum in the smaller members of the family Pla- 
tyrrhina. 
3. That the depth and complexity of the characteristic involution of the cortical grey 
matter surrounding the calcarine sulcus (or, in other words, that part which, according 
to its homology mth the structure so named in the human brain, must be called “ hippo- 
campus minor”) is one of the most striking characteristics of the typical Simian brain, 
as it is greatest in Cercopithecus, Macacus, Cynoc&phalus, and Cebus, less in the anthro- 
poid Apes, and least of all, in proportion to the mass of cerebral substance contained 
in the lobe, in Man. 
Appendix. 
Table showing the comparative length of the posterior lobes of the cerebrum in certain 
Quadrumana, and other Mammalia, measured upon the plan described at p. 191. 
Actual length in inches. 
Proportion. 
Antero-median 
portion. 
Posterior 
portion. 
Antero-median 
portion. 
Posterior 
portion. 
Homo (average) 
4-40 
2-35 
100 
53 
Pithecus satyrus 
2-00 
1-00 
100 
50 
Presbytes leucoprymnus 
1-50 
•70 
100 
47 
Cercopithecus pygerythrus 
1’65 
•90 
100 
54 
C. sabaeus 
1-65 
•90 
100 
54 
C. mona 
1-20 
•65 
100 
54 
Macacus silenus 
1-75 
•95 
100 
54 
M. erythraeus 
1-73 
•90 
100 
52 
Cynocephalus porcarius 
2-20 
1-25 
100 
57 
Cebus apella 
1-60 
•95 
100 
59 
Nyctipithecus felinus 
1-20 
•70 
100 
58 
Hapale cedipus 
•85 
•50 
100 
59 
H. jacchus 
•80 
•50 
100 
62 
Lemur nigrifrons 
1-00 
•35 
100 
33 
Stenops Javanicus 
•90 
•40 
100 
44 
Otolicnus ? 
•85 
•35 
100 
41 
Pteropus Edwardsii 
•79 
•18 
100 
24 
Erinaceus Europaeus 
•60 
•07 
100 
11 
Cercoleptes caudivolvulus 
1-20 
•40 
100 
33 
Felis domesticus 
1-20 
•25 
100 
21 
Canis familiaris 
1-55 
•55 
100 
35 
Equus caballus 
3-30 
1-25 
100 
35 
Sus scrofa 
2-15 
•55 
100 
25 
Dicotyles torquatus 
2-00 
•40 
100 
20 
Lepus cuniculus 
1-00 
•20 
100 
20 
