PLATE X. 



Fig. Page 



1. Sardiiiioides ilhistrans, sp. nov. ; imperfect, vertically cruslied fish, upper 



aspect, the type specimen ; also lateral view of head of the same 

 (1 a), and some hinder al)dominal vertebrae (1 h). — English Chalk. 

 Enniskillen Collection (B. M. no. P. 3977). hr., branchiostegal rays; 

 do., dorsal fin-rays; rjio., ej^iotic ; eth., mesethmoid ;_/'., dorsal fin- 

 supports ; /)■., frontal; md., mandible; imv., maxilla; na., nasal; 

 op., operculum; jxt., parietal; 2)cf., pectoral fin; piv., pelvic fin; 

 pm.i'., premaxilla ; po'p., preoperculum ; |)/f., postfrontal; sni.v. 1, 2, 

 supramaxillfe ; socc, supraoccipital ; sop., sid)operculum ; spb., supra- 

 orbital. 34. 



2. Anlojnis flameiitoKu.'<, Cuvier ; left lateral aspect of head Avitli opercular 



apparatus, and upper view of skull (2 a). — Recent Fish, ng., articulo- 

 angular ; ao., antorbital ; co., circmnorbital ring; d., dentary; 

 hri)., hyomandibular ; ioj)., interoperculum ; pf<>., pterotic ; j^tf., post- 

 temporal; qii., quadrate; -s/., supratemporal ; ,9//., symplectic ; other 

 letters as in fig. 1. 33. 



3. AcrognatJins hoojys, AgasBiz; distorted head and trunk, upper aspect (in 



part) and right lateral aspect (3 a), the type specimen. — Chalk ; 



LcAves. Mantell Collection (B. M. no. 4304). ((., anal fin ; d., 



dorsal fin; 7;;,''., maxilla; pet., pectoral fin; piv., pelvic fin; rpi., 

 quadrate. 36. 



All the figures of tlie natural size. 



