60 



Fishery Bulletin 90(1). 1992 



other morphological characters is 

 Tooth W. In addition, correla- 

 tions of L. Temporal Fossa and 

 W. External Nares with other 

 characters are relatively low. 

 The rest of the characters are 

 placed in two groups. The first 

 cluster (characters listed between 

 1 and 19 at top of Fig. 2) includes 

 lengths involving the anterior 

 portion of the skull, tooth num- 

 bers, and Orbital L. The second 

 group (characters 4 to 8 as listed 

 in Fig. 2) includes a variety of 

 skull widths, dimensions of the 

 braincase, and Ht. Ramus. 



Character loadings of a prin- 

 cipal components analysis using 

 25 blocks are presented in Table 

 3. The first component explained 

 57.0% of the total character vari- 

 ance and the second 18.5% 

 (cumulative total of 75.4%). Pro- 

 jections of all blocks onto these 

 components are shown in Figure 

 3, while Figure 4 is a map sum- 

 marizing geographically the pro- 

 jections onto the first component. 

 This component, which reflects 

 general skull size, has relatively 



