PISCES. 171 



PTYCKOOUS (continued)— 



oweni, F. Dixon, Geol. Sussex, 1S50, p. 364, pi. xxxi, f. 2 ; J. 



Morris, Cat. Brit. Foss., 1854, p. 342 ; A. S. Woodward, Cat. 



Foss. Fishes B. M., pt. i, 1889, p. 138, pi. v, f. 8. 

 LOC. U. Chalk ; Kent and Sussex. [Tooth ; Brit. Mus.] 

 paucisulcatus, Dixon, v. Ptychodus latissimus. 



polyg"yrus, L. Agassiz, Poiss. Foss., Feuill., p. 55 (1835), and 

 vol. iii (1839), p. 156, pi. xxv, f. 4-1 1, pi. xxv 0, f. 21-23; 

 W. Buckland, Geol. and Mineral., ed. 2, 1837, vol. ii, p. 48, 

 pi. xxvii/; F. Dixon, Geol. Sussex, 1850, p. 363, pi. xxx, f. 9, 

 pi. xxxi, f. 10; J. Morris, Cat. Brit. Foss., 1854, p. 342; 

 S. J. Mackie, Geologist, vol. vi, 1863, p. 161, pi. ix; A. S. 

 Woodward, Quart. Journ. Geol. Soc, vol. xliii, 1887, p. 127, 

 ] pi. x, f. 11, and Cat. Foss. Fishes B. M., pt. i, 1889, p. 143, 

 pi. v, f. 7. [Varieties are named P. concentricus, P. 

 viarginalis, and P. sulcatus, g.z>.] 



'Teeth allied to Diodon' G. A. Mantell, Foss. S. Downs, 1822, 

 p. 231, pi. xxxii, f. 23, 24. 



Ptychodus latissimus, L. Agassiz (errore), Poiss. Foss., vol. iii 

 (1843), P- 1 57j pi- xxv a, f. 8 ; F. Dixon, Geol. Sussex, 1850, 

 descr. to pi. xxx, f. 1, 2. [Tooth ; Oxford Mus.] 



LOC. U. and L. Chalk ; Sussex, Kent, Essex, and Hampshire. 

 [Teeth ; Brit. Mus. (pars).] 



rugrosus, F. Dixon, Geol. Sussex, 1850, p. 362, pi. xxxi, f. 5 ; 



J. Morris, Cat. Brit. Foss., 1854, p. 342 ; A. S. Woodward, 



Cat. Foss. Fishes B. M., pt. i, 1889, p. 136, pi. v, f. 1-3. 

 Ptychodus altior, F. Dixon (non Agassiz), Geol. Sussex, 1850, 



p. 362, pi. xxx, f. 10. 

 LOC. U. and L. Chalk ; Kent, Sussex, Surrey, and Yorkshire. 



[Tooth.] 



spectabilis, Agassiz. v. Protosphyraena (fins of). 

 sulcatus, named variety of P. fiolygyrus (L. Agassiz, Poiss. Foss., 

 vol. iii (1839', P- !5 6 )- 



PTYCHOLEPIS, L. Agassiz, Poiss. Foss., vol. ii, pt. ii (1843), 

 p. 107. 

 bollensis, L. Agassiz, Neues Jahrb., 1832, p. 142, and Poiss. 

 Foss., vol. ii, pt. ii (1843), P- Ic, 8> pi- lviii b ; W. C. William- 

 son, Phil. Trans., 1849, p. 444 ; J. Morris, Cat. Brit. Foss., 

 1854, p. 342. 

 LOC. L. Lias ; Lyme Regis. U. Lias ; Whitby. [Fish ; Brit. 

 Mus.] T. 



curtus, P. M. G. Egerton, Ann. Mag. Nat. Hist. [2] vol. xiii, 

 1854, p. 435, and Figs, and Descript. Brit. Organic Remains, 

 dec. viii (Mem. Geol. Surv., 1855), no. 8, pi. viii ; J. Morris, 

 Cat. Brit. Foss., 1854, p. 342. 

 LOC. L. Lias ; Lyme Regis. [Fish ; S. H. Beckles Coll.] 



