Explanation op plates 20. 21. 22. 
31 
Plate 20. V. I. p. 215. 
Head of the Mosasaurus, or Great Animal of Maestricht. 
(Guvier.) 
Plate 21. V. I. p. 221. 
Pterodactylus longirostris in the lithographic .slate of 
ichstedt. (Cuvier and Goldfuss.) 
la this Plate, and Plate 22, the same letters and figures 
esignate the corresponding Bones in the different Animals 
to which they are affixed ; they are copied chiefly from the 
feUres and Explanations of Dr. Goldfuss, in his Beitrage 
zur Kenntniss verschiedener Reptilien der VorweU. 
P- Cavitas narium. 
A. Cavitas intermedia. 
©. Orbita. 
a. Maxilla superior. 
ti- Vel os nasi vel inter-maxillare ? 
0. Operculum nasale. 
^1- Aut os frontis anterius vel nasale? 
Os frontis proprium. 
fi Os parietale. 
Os petrosum. 
H- Pars basilaris ossis occipitis. 
h- Pars lateralis. 
I- n* ^y^^Panicum s. quadratum. 
, ^"‘^^“’^ti^Posterius. 
h Os mastoideum. 
Os zygomaticum. 
Aut os lacrymale vel superciliare ? 
Annulus orbitalis. 
Oorpus ossis sphenoidei. 
^ '"^oessus transversus ossis sphenoidei. 
Os pterygoideum. 
