Table 2.

Hypoglossal canals of fossil crania compared with the human and ape samples

Specimens	Canal area (mm2) SD	Compared with Pan troglodytes	Compared with Homo sapiens
Skhul 5	20.15	t  = 3.80; P < 0.0001	t  = 0.14; NS
La Ferrassie 1, La Chapelle aux Saints	15.59  (1.16)	t  = 2.05; P < 0.01	t  = 0.49; NS
	[16.41 and 14.77, respectively]
Kabwe	19.00	t  = 2.58; P < 0.02	t  = 0.29; NS
Swanscombe	24.52	t  = 5.49; P < 0.0001	t  = 0.79; NS
Sts 19, Stw 187, Stw 53	9.21  (1.61)	t  = 0.520; NS	t  = 2.303; P < 0.025

Values are for one-tailed Student’s t tests based on comparisons of total, combined-sex samples. 

NS, not significant.