PLATE XXV II. 



Fig. Page. 



1. Pachyrhizodus subulidens (Owen) ; bead from left side, (1 (/) from above, 



and (1 b) from below, with (1 c) hinder view of right clavicle, two 

 thirds nat. size. — Zone of Schloenbachia varians; Barton, Cambridge. 

 Sedgwick Museum, Cambridge, ao., antorbital; Int., basibranchial ; 

 br., branchiostegal rajs ; d., dentary; eph., epihyal ; epo., epiotic ; 

 fr., frontal; mx., maxilla; pa., parietal; po., postorbital; /'"/>., pre- 

 operculum ; ptf., postfrontal (sphenotic) ; so., suborbital ; socc, 

 supraoccipital ; sq., squamosal. 1^'.'. 



2. Ditto; type specimen, anterior half of left maxilla, outer and (2a) 



upper views, with (2 b) part of oral face enlarged twice. — Zone of 

 Holaster subglobosus; Cherry Hinton, Cambridge. Sedgwick 

 Museum, Cambridge. \-\K 



3. Ditto ; right maxilla, inner view, and (3 a) part of right dentary, outer 



view. — Zone of Holaster subglobosus; Sussex and (3(c) Hailing, 

 Kent. B. M. nos. P. 1808 and 3GG35. 130. 



4. Ditto; scale of B. M. no. P. 1808. 131. 



Unless otherwise stated, figures are of the natural size. 



