PLATE XVII. 



Fig. Page 



1. Histionotus angularis, Egerton; fish with imperfect dorsal fin, lacking 



greater part of caudal region, nat. size. — Middle Purbeck Beds; 

 Swanage. The type specimen. Egerton Collection (B. M. no. P. 577). 

 c/., clavicle; d., dentary ; mx., maxilla; pa., parietal; pop., pre- 

 operculum ; ptt., post-temporal; scl., supraclavicle ; st., supra- 

 temporal. 77. 



2. Ditto ; nearly complete fish, with crushed cranium and distorted tail, 



nat. size. — Ibid. Dorset County Museum, Doixmester. br., branchi- 

 ostegal rays; d., dentary; iop., interoperculum ; vix., maxilla; op., 

 operculum; pa., parietal; pel., post-clavicular scales; pop., preoper- 

 culum; sop., suboperculum. 77. 



3. Ditto ; roof of skull, two-and-a-half times nat. size. — Ibid. British 



Museum, no. P. 5935. co., upper circumorbitals ; fr., frontal; pa., 

 parietal. 77. 



4. Ditto. Supposed palatine or ectopterygoid, Avith comparatively stout 



teeth, three times nat. size. — Middle Purbeck Beds ; Tisbury, Wilt- 

 shire. Cunnington Collection (B. M. no. 46421). 78. 



5. Ditto ; inner view of three flank-scales, one traversed by the slime-canal 



of the lateral line (/.), two-and-a-half times nat. size, and (5 a) a flank- 

 scale, outer face, three times nat. size. — Middle Purbeck Beds ; 

 Swanage. Enniskillen Collection (B. M. no. P. 3614). 79. 



6. EnclteJijoJcpis andrewsi, A. S. Woodward; nearly complete fish, two-and- 



a-half times nat. size, with a dorsal fin-support (6 a) enlarged twelve 

 times, and some scales (6 b) enlarged fifteen times. — Middle Pur- 

 beck Beds ; Teffont, Wiltshire. The type specimen. Rev. W. R. 

 Andrews Collection (B. M. no. P. 6303). 81. 



7. Encltelijolepis pectoralis (Sauvage) ; nearly complete fish, twice nat. size, 



with a dorsal fin-support (7 a) and a scale (7 b) enlarged ten times. — 

 Upper Portlandian ; Savonnieres-en-Perthois, Meuse, France. The 

 type specimen. British Museum, no. P. 7359. 81 



8. CEonoscopus sp. ; right maxilla, outer view, nat. size. — Middle Purbeck 



Beds; Swanage. British Museum, no. 33477. 



