EU ON ATHID JE. 
309 
broad as deep, and its maximum breadth exceeding one-third the 
length of the cranium; maxillary teeth very slender, those of the 
premaxilla and dentary much stouter and closely arranged. Principal 
flank-scales about as deep as broad ; all the scales of the abdominal 
region very finely serrated, and many also equally finely pectinated. 
Form. Sf Log. Lower Ivimmeridgian (Lithographic Stone) : Bavaria. 
43003. The type specimen, in counterpart; Solenhofen. Winkler’s 
original description and figure are very inadequate and in 
part incorrect. Some further details may therefore be 
given, illustrated by the accompaning outline-sketch 
(fig. 35). The cranial roof is displaced forwards, exhibit¬ 
ing the thick parietals {pa.) and frontals (//’.), with the 
Fig. 35. 
Heterolepidotus typicas ; head-bones of type specimen, less than one half 
natural size. 
br., branchiostegal rays ; c.h., ceratohyal ; c.o., circumorbitals ; ep.h., epihyal ; 
fr., frontal; hm., hyomandibular; i.op., interoperculum ; rad., mandible ; 
rax., maxilla; op., operculum ; p.cl., postclavicle; p.op., preoperculum; 
pci., parietal; pas., parasphenoid ; pmx., premaxilla ; s.rax., supramaxilla ; 
s.o., suborbitals; s.op., suboperculum ; sq., squamosal; st., supratemporal; 
sym., symplectic; v., vomer. 
squamosals ( sq .), from the inner aspect; while the base of 
the skull occurs still further forwards, apparently com¬ 
prising the long and narrow parasphenoid (pas.) with the 
pair of vomerine bones (y.) in front. The two premaxillte 
