130 DAVIDSON BLACK 
Kappers (2) has shown that the relations obtaining between 
the lunate and transverse occipital sulci are such as to give rise 
to two distinct varieties of pattern in this region. 
In one variety the occipitalis transversus is not connected 
with the sulcus lunatus, which, is the common condition in 
Ateles (and Cebidae), and thus has been termed the ‘Ateloid 
condition.’ The second variety is characterised by a more or 
Fig. 1 Lateral view of the left side of the cerebrum of a new-born babe, 
exposed in situ. S. cent., Rolandic sulcus; S. lun., sulcus lunatus; S. interpar., 
pars intraparietalis of sulcus interparietalis (B. N. A.); S. occ., sulci occipitales; 
S. occ. inf., sulcus occipitalis inferior; S. occ. trans., sulcus occipitalis trans- 
versus; S. par. occ., sulcus (fossa) parieto-occipitalis; S. prael., sulcus praelunatus. 
less complete fusion between the lunate and transverse occipital 
sulci such as usually obtains superficially in the anthropoid apes. 
On this account Kappers has termed the second variety the 
‘Anthropoid condition.’ In the specimen here recorded it is 
evident that the ‘Ateloid condition’ obtains. | 
Van Valkenburg, in his most interesting paper on the sulcus 
simiarum in man (i), has enumerated certain definite conditions 
