CESTKACIONTIDiE. 
333 
1882. Acrodus falcifer, C. Hasse, Natiirl. Syst. Elasmobr., Besond. 
Theil, p. 191, pi. xxiv. figs. 12-14, pi. xxv. figs. 15-21. 
1887. Acrodus (?) falcifer, A. S. Woodward, Geol. Mag. [3] yoI. iv. 
p. 104. 
1887. Acrodus falcifer, K. A. von Zittel, Handb. Paleeont. vol. iii. p. 76, 
woodc. fig. 72. 
Type. Imperfect skeleton, with dentition ; Palaeontological 
Museum, Munich. 
Extremities of the principal lateral teeth rounded or acute: 
coronal surface with a longitudinal keel, and the superficial markings 
feebly reticulate. 
The cuspidate anterior teeth are well seen in the type specimen, 
though not distinctly indicated in the published figure. 
Form. Sf Loc. Lower Kimmeridgian (Lithographic Stone): Ba¬ 
varia. 
^38004. Plaster cast of type specimen, the original from Solenhofen. 
Purchased , 1864. 
37014. Imperfect portions of the skull and other cartilages, with 
the vertebral column and broken dorsal fin-spines of a 
smaller fish about 0*29 in length; Solenhofen. The spe¬ 
cimen is referred to Acrodus by C. Hasse, Xeues Jahrb. 
1883, vol. ii. p. 66. Haberlein Coll. 
The following dorsal fin-spines, from the Kimmeridge Clay of 
Weymouth, probably pertain either to this or an allied species : 
43287, 43567. Two short broad spines, the exserted portion of the 
largest, when perfect, measuring about 0*025 in length. 
Purchased, 1871, 1872. 
41878. Much smaller narrower spine. Purchased , 1S69. 
Cestracion sulcatus* sp. nov. 
1843. Strophodus sulcatus, L. Agassiz, Poiss. Foss. vol. iii. p. 176 (name 
only). 
Type. Detached teeth, shown, of the natural size, in PI. XIII. 
figs. 11, 12. 
An imperfectly known species, the coronal contour of the prin¬ 
cipal teeth gently rounded, with angular or abrupt extremities ; 
superficial reticulations very coarse, longitudinal keel generally 
indistinct, sometimes with a furrow on one side. 
Form. 4' Loc. Cenomanian; Kent. 
