PYCNODONTIDJE. 
281 
Generically Indeterminable Cretaceous Pycnodonts. 
The following species represented in the Collection have been 
founded upon very fragmentary evidence and cannot as yet be 
generically determined. 
Acrotemnus faba 5 Agassiz. 
1837-44. Acrotemnus f aba, L. Agassiz, Poiss. Foss. vol. ii. pt. li. p. 203, 
pi. lxvi. a. figs. 16-18. 
1887. Ccelodus faba, K. A. von Zittel, Handb. Palseont. vol. iii. p. 249. 
Type. Group of five teeth ; British Museum. 
A generic and specific name based upon the specimen mentioned 
below. The teeth are smooth and bean-shaped, each with a sharp, 
keel-like coronal summit overhanging a slight indent which has a 
feebly-crimped inferior margin. They may perhaps be the principal 
lower teeth of a species of Ccelodus. 
Form. § Loc. Senonian : Sussex. 
4584. Type specimen ; Chalk, Lewes. The largest tooth measures 
0 - 014 in width. Mantell Coll , 
Pycnodus scrobiculatus, Eeuss. 
1845. Pycnodvs scrobiculatus, A. E. Reuss, Yerstein. bolim. Kreideform, 
pt. i. p. 10, pi. iv. figs. 15-25. 
1845. Pycnodus rostratus, A. E. Eeuss, ibid. p. 10, pi. iv. fig. 37. 
1845. Pycnodus semilunaris, A. E. Eeuss, ibid. p. 10, pi. iv. figs. 43-45. 
1856. Pycnodus scrobiculatus, C. E. Fischer, Allg. deutsche Nat. Zeit, 
n. s. vol. ii. p. 138, figs. 8-16. 
1856. Ctenoptychius?, C. E. Fischer, ibid. p. 138, figs. 17-20. 
1874. Pycnodus semilunaris, St. Zarecznego, Sprawozd. Komisyi. 
Fizyjograf. Galicyi, vol. viii. p. (128), pi. i. fig. 4. 
1875. Pycnodus scrobiculatus, H. B. Geinitz, Palaeontogr. vol. xx. pt. i. 
p. 301, pi. lxv. figs. 22-32. 
1878. Pycnodus scrobiculatus, A. Fritscli, Rept. u. Fische bohm. 
Kreideform. p. 22, pi. ii. figs. 6, 7. 
1893. Pycnodus scrobiculatus, A. S. Woodward, Geol. Mag. [3] vol. x. 
p. 492, pi. xvii. fig. 7. 
Type. Detached teeth. 
The teeth of this form are tumid and coarsely punctate, apparently 
almost conical when unworn. They are of very small size, and 
have hitherto been found arranged only in three longitudinal series 
on a narrow vomer. The median and lateral teeth are about equal 
in size, and the latter are truncated at their outer border. ’*/ 
Form. 4* Log. Cenomanian (Lower Planerkalk): Kosstitz, Bohemia ;/ 
Galicia. Senonian : Sussex and Kent; 
