26 



E. TRINKAUS 



Fig. 1 Dorsal (above) and palmar (below) views of the Cough's Cave 1 metacarpals and proximal manual phalanges; x 0.9. 



This surface gracility is reflected in a metacarpal 3 robusticity 

 index [midshaft height * breadth)"' / articular length] of 13.1 for 

 Gough's Cave 1 . This value is below that of the Le Peyrat 5 right 

 metacarpal 3 [15.0 (Patte, 1968)] and the mean of a modem British 

 sample [14.4 ± 1.2, N = 38 (Musgrave, 1970)]. 



The metacarpal 2 base has a large concave surface for the trap- 

 ezoid bone, accompanied by facets for the trapezium and capitate 

 at right angles to each other and close to 45° from the diaphyseal 

 axis. The angle of 50° for the capitate facet is close to the mean of 



a recent Euroamerican sample [56.0° ± 9.3°, N = 53 (Niewoehner 

 et fl/., 1997)]. In conjunction with this oblique orientation of the 

 Gough's Cave 1 metacarpal 2 / capitate articulation, Gough's Cave 

 1 possesses a large and projecting metacarpal 3 styloid process. 

 The index of styloid projection (styloid projection vs. metacarpal 

 3 articular length) for Gough's Cave 1 is 6.6. This value is close to 

 the mean for a recent Euroamerican sample of 7.4 [± 1.7, N = 33 

 (Niewoehner et al., 1997)] and below that for the Le Peyrat 5 right 

 metacarpal 3 [8.6 (Patte, 1968)]. The metacarpal 5 base combines 



