PLATE XVI. 



Fig. Page. 



1. Leptotrachelus elongatus (Agassiz) ; imperfect distorted fish without fins, 



the type specimen, and its counterpart (1 a), with part of the palato- 

 pterygoid arcade enlarged one and a half times (1 b), and four scutes 

 enlarged four times (1 c). — Probably from a Turonian zone ; near 

 Lewes. Mantell Collection (B. M. nos. 4132-33). d., two dorso- 

 lateral scutes in side-view, showing uncinate spine, four times nat. 

 size; ecpt., ectopterygoid ; /., anterior scute of lateral line, inner 

 aspect, four times nat. size ; pi., palatine, incomplete in front ; 

 v., ventro-lateral scute, inner aspect, four times nat. size. 70. 



2. Ditto ; head exposed from above, with its counterpart (2 a), one and a 



half times nat. size. — Probably from a Turonian zone ; Lewes. 

 C apron Collection (B. M. no. 49793). eth., mesethmoid; fr., frontal; 

 pa., parietal; pi., palatine; pmx., premaxilla; ptt., post-temporal; 

 s., dermal scutes ; socc, supraoccipital ; sq., squamosal ; x., probably 

 a sclerotic ossification. 70. 



3. Ditto ; inner view of hinder half of cranial roof, one and a half times nat. 



size. — Probably from a Turonian zone ; Mailing, Sussex. Willett 

 Collection no. 115, Brighton Museum. Letters as in fig. 2. 70. 



4. Ditto ; head, superior and left lateral aspects. — Zone of Micraster 



coranguinum; Bromley, Kent. B. M. no. 43574. d., dentary; eth., 

 mesethmoid; Inn., hyomandibular ; mpt, metapterygoid; orb., orbit; 

 pmx., premaxilla. 71. 



5. Ditto ; imperfect rostral part of cranium and palatines, upper aspect. — 



English Chalk. Wetherell Collection (B. M. no. 43098). Letters as 



in fig. 2. 71. 



6. Ditto ; fragment of palatine, oral aspect showing bases of attachment for 



teeth, one and a half times nat. size. — Chalk; Sussex. Dixon Collec- 

 tion (B. M. no. 25803). 71. 



7. Ditto ; caudal vertebras, right lateral aspect. — Probably from a Turonian 



zone; near Lewes. Mantell Collection (B. M. no. 4134). //., haemal 

 arch; v., neural arch. 72. 



8. Ditto; three ventro-lateral scutes immediately behind pelvic fin, inner 



aspect, from same specimen as fig. 2. 73. 



Figures of natural size, except when otherwise stated. 



