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MR. E. S. GOODRICH : RESTORATIONS OF 



shows in this region the bone stretching uninterruptedly from three centres 

 of ossification on each side, and three only : the parietal, the intertemporal, 

 and the snpratemporal. Grooves similar to those just mentioned are found 

 on the frontals, diverging from the hinder border (as figured by Pander, 

 see fig. 5), on the squamosal, and on some of the trunk scales running 

 between the lateral-line scales and the mid-dorsal line. The diverging lines 

 on the frontals do not mark off the postfrontals as suggested by Gregory; 

 these bones are distinct but small, harbour the lateral-line canal, and seem 

 just to reach the edge of the orbit. A distinct intertemporal is present. 

 A suture separates the two parietals ; but the frontals are fused superficially, 

 although the suture can be distinguished on the inner surface. In one 

 specimen a small plate and a minute nodule, possibly transparent in the 

 living, were situated in the pineal foramen. Jaekel figures several such 

 plates in Diplopterus (8). In front of the frontals the snout is covered by 

 a shield formed of small plates the outlines of which can still be distinguished 



Fig. 3. 



B 



Fig. 2. Restoration of the dorsal, A, and right side, B, of the head of Osteolepis micro- 



hpidotus, Ag., from Gregory (6). 

 Fig. 3. Restoration of the dorsal, A, and right side, B, of the head of Osteolepis macru- 



lepidotus, Ag., from Watson & Day (14). 



Lettering for fi(/s. 2 & 3: — 



D, dentary ; D.So., dermal supraoccipital ; F & Fr, frontals ; Gu, srular; I.op., inter- 

 opercular; It, intertemporal; Jit, jugal ; La, lacrymal ; Mx, maxilla; n, nostril: 

 NA, nasal; OP, opercular; PA, parietal; Pf, prefrontal; P.O. & Po.O., postorbital ; 

 Po.Fr. & Po.f., postfrontal ; P.P., postparietal ; Q.j., quad ratoju gal; Sp, splenial ; 

 Sg, squamosal ; 5. OP., subopercular ; S. T, suprateurporal ; TAB & Tb, tabulare. 



to some extent on the inner surface. Unlike Watson and Day, I find here a 

 fairly large median ethmoid between the nasals. Almost at the extreme 

 lateral edge of the rounded rostrum can usually be seen an external nostril, 

 which in some specimens is certainly surrounded by bone; while the position 

 of the lower or posterior nostril is perhaps indicated by a notch on the 



