Exviot SmituH, Braz of Archeocett. 51 
quite visible as a small umbilicate area in part of the ‘‘ desert 
of Broca (fig 3, a.d.), wherefore it follows that in the 
early embryo the olfactory bulb and peduncle develop as in all 
” 
region 
other mammals. Moreover, in all Odontoceti traces of the py- 
riform lobe are found even in the adult; and in the brain of 
Kogia greyt the rhinal fissure and the typical (macroscopically 
only) pyriform lobe are retained in a form as clearly defined as 
that of any macrosmatic mammal (fig. 4). Professor HASWELL, 
in describing this brain’ emphasises the fact that ‘‘the most re- 
Fic. 4.—Ventral aspect of left hemisphere of Cogza greyt. Reduced approxi- 
mately one-half. a.d., corpus striatum (area desert); 4.0., place occupied by 
bulbus olfactorius in feetus; /.7.@., fissura rhinalis anterior; /.7.2., fissura 
rhinalis posterior; /7.4., lobus pyriformis. 
markable feature of the [basal] region, and perhaps of the 
whole brain, is in the great depth of the ectorhinal fissure, a 
feature marking off the present form very strongly from 
Delphinus”’ (p. 438). Since his illustrations do not properly 
delineate this interesting conformation, Professor HAswELi 
1 W. A. HASWELL, ‘‘On the Brain of Grey’s Whale (ogia greyz),” ‘Lin- 
nean Society of New South Wales Proc.,’ vol. 8, 1883 (publ. 1884), pp. 437-439, 
pl. XXI. 
