PLATE XVIII. 
Fig. Page 
1. Pholidophorus caudaJis, sp. nov. ; left lateral aspect,— 
Lower Lias; Lyme Kegis. [P. 3664.] 457 
2. Ditto ; left lateral aspect.—Ibid. P. 3864 a.] 458 
3. Leptolepis macrophthaknus , Egerton; right lateral aspect. 
Oxford Clay ; Christian Malford. [46344.] 508 
4. Thrissops portlandicus, sp. nov. ; left lateral aspect, with 
tail partly restored from counterpart.—Portland Stone ; 
Isle of Portland. [P. 5538,] 525 
