Manchester Memoirs, Vol Ix. (1916), No. % 



—- HM. 



Text-fig. 4. — Rhizodopsis sauroides (Williamson). Dorsal and 

 right lateral aspects of a head showing the dorsal surface of the 

 pterygoids and palatines, of the chondrocranium and the hyomandi- 

 bulars. XI}. IIm., Hyomandibular ; P.Sc.C, ridge of the chon- 

 drocranium over the posterior vertical semicircular canal ; Pt., 

 Pterygoid; II., foramen for the optic nerve ; Sc.P., Sclerotic plates. 



