PLATE XIII. 



Fia. Page. 



1. Halec eupterygins (Dixon); imperfect head and abdominal region, left 



lateral aspect. — A Turonian zone; near Maidstone. B. M. no. 32336. 

 ng., articulo-angular ; hr., brancliiostegal rays; cl., clavicle; cl., 

 dentary; do., dorsal fin; mpt., metapter jgoid ; inx., maxilla; |)c/., 

 post-clavicle; j^ct., pectoral fin; jiIik, pelvic fin-supports and portion 

 of fin; ])mx., premaxilla ; pop., preoperculum ; smx., supramaxilla. 53. 



2. Ditto ; imperfect head, right lateral aspect. — A Turonian zone ; Lewes. 



Mantell Collection (B. M. no. 4285). ecpt., ectopterjgoid ; hm.,]ijO' 

 mandibular; p/., palatine ; (/»., quadrate; .sv;/., sclerotic ; other letters 

 as in fig. 1. 5] . 



3. Ditto ; cranial roof, upper aspect. — Zone of Holasfcr suhglohosns ; 



Hailing, Kent. Harford Collection (B. M. no. P. 5662). epo., 

 epiotic ; eth., restored outline of mesethmoid ; //■., frontal; ixi., 

 parietal; socc. , supraoccipital ; ,'^j)/a, supraorbital ; tsvy., probably squa- 

 mosal ridge. 51. 



4. Ditto; portion of hinder part of cranial roof, upper aspect, twice nat. 



size. — Probably zone of Holasfer snhglobosus ; Burham, Kent. 

 Enniskillen Collection (B. M. no. P. 4537). Letters as in fig. 3. 51. 



5. Ditto; remains of jaws, left lateral aspect, and imperfect mandible (5 a), 



inferior aspect. — English Chalk. B. M. no. P. 9252. s., mandibular 

 symphysis; other letters as in figs. 1, 2. 53. 



6. Ditto; remains of jaws of right side, outer aspect. — English Chalk. 



Enniskillen Collection (B. M. no. P. 3657). Letters as in fig. 1. 53. 



7. Ditto ; left premaxilla, inner aspect. — Chalk ; Brighton. Capron Collec- 



tion (B. M. no. 49750). 53. 



8. Ditto ; left opercular apparatus, outer aspect. — Probably from Burham. 



Mrs. Smith's Collection (B. M. no. 49111). d., clavicle ; op., oper- 

 culum; pel., postclavicle ; pop., preoperculum; sop., suboperculum. 53. 



9. Ditto ; left post-temporal, outer aspect. — A Turonian zone ; Lewes. 



Enniskillen Collection (B. M. no. P. 3657rO. 54. 



All the figures, except 4, of the natural size. 



