PLATE VII. 



Fig. Page. 



1. Hoplo'pteryx leivesiensis (Maiitell) ; inner aspect of left mandibular sns- 



pensorium, ptery go- quadrate region, hyoid arcli, and other bones. — 

 Zone of TerehratuUna gracilis; Cuxton, Kent. Harford Collection 

 (B. M. no. P. 5689). ch., ceratoliyal; ecpt., ectopterjgoid ; cjjh., 

 epiliyal ; ////, hypoliyal; km., hyomandibiilar ; ih., interliyal (stylo- 

 liyal) ; mpt., metapterygoid ; oj)., part of operculum; ^j/., palatine; 

 jj/^., post-temporal ; (/u., quadrate ; sc/., supraclavicle ; n//., symplectic. 18. 



2. IIo]}lo^)terijx snperlus (Dixon) ; head with opercular apparatus, right 



lateral aspect. — Vrobablj zone oi BhyncJioveUa eurieri; Hailing, Kent, 

 B. M. no. 41104. ao., antorbital ; (/., part of dentary ; fr., frontal; 

 ioj)., interojjerculum ; ?»,*'., part of maxilla; oj)., operculum; pmx., 

 part of premaxilla ; jwp., preoperculum ; qu., quadrate; sop., sub- 

 operculum. 21. 



3. 4. Ditto ; two scales, outer aspect, the ornamented exposed area to the 



left.— Chalk; Kent. B. M. no. 33486. 22. 



5. Ditto ; inner view of overlapping scales, showing tuberculations. — A 



Turonian zone; Southeram, Lewes. Dixon Collection (B. M. no. 

 25959). 22. 



6. Homoiwtus dorsalis, Dixon ; imperfect trunk, left lateral aspect, with scale 



{6a) enlarged twice. — Zone of Micraster coranguiimm; Gravesend, 

 Kent. Bowerbank Collection (B. M. no. 39074). a., anal fin; c, 

 caudal fin; cl., plate of clavicle; d., dorsal fin; 'plv., pelvic fin. 27. 



7. Ditto ; imperfect fish, left lateral aspect. — Zone of Micraster corangui- 



num ; Northfleet, Kent. B. M. no. 33230. md., portion of mandible ; 

 O'p., portion of operculum; other letters as in fig. 6. 27. 



8. Homonotus rotundns, sp. nov.; distorted small fish, right lateral aspect, the 



type specimen. — Zone of Hulaster sidjglobosvs ; Page's Pit, Westwell, 

 near Charing, Kent. Harris Collection (B. M. no. P. 315). Lettering 

 as in fig. 6. 28. 



All the figures, except 6 a, of the natural size. 



