PYCXODONTIDiE. 
235 
region, and in the simpler mammillation of the teeth. The maxi¬ 
mum depth of the trunk exceeds its length. 
A relatively large specimen from the Lithographic Stone of' 
Solenhofen, in the Munich Museum, is regarded by "VVagner (Joe. cit. 
1862, p. 335) as probably a distorted example of this species, but in 
case it happens to prove distinct is provisionally named G. turgidus. 
Form. Sf Loc. Lower Kimmeridgian (Lithographic Stone): Bavaria. 
P. 3774. Fragment figured by Agassiz, loc. cit. pi. Ixix. c. fig. 4, as 
one of the type specimens; Solenhofen. Part of a 
pectoral fin shows seven basals, and this is evidently not 
the complete series. A calcified gill-filament exhibits the 
sparse denticles on one side as in Mesturus. 
Enniskillen Coll. 
37108. Nearly complete fish, partly crushed and fractured, but 
displaying the relations of the hyomandibular (Jim.) to the 
operculum (op.) and preoperculum (p.op.) as shown in 
PL XYI. fig. 3 ; Solenhofen. Hciberlein Coll. 
37813. Smaller nearly complete fish, in counterpart; Solenhofen. 
Hciberlein Coll. 
37814. A more imperfect specimen O’175 in length, in counter¬ 
part ; Solenhofen. A detached tooth resembles the form 
described by Agassiz in G. macrophthalmus. 
Hciberlein Coll. 
37106. Imperfect fish 0*14 in length, in counterpart; Solenhofen. 
Hciberlein Coll. 
P. 1623, P. 1623 a, P. 2098. Two imperfect small specimens and 
the scattered remains of a larger fish; Solenhofen. No. 
P. 1623 shows the feebly serrated abdominal ridge-scales, 
and no. P. 2098 displays the splenial dentition. 
Egerton Coll. 
P. 3769, P. 3772-73. Four imperfect examples of the trunk; 
Kelheim. Enniskillen Coll. 
Gyrodus frontatus, Agassiz. 
[Plate XYI. fig. 2.] 
1839-44. Gyrodus frontatus, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
pp. 226, 301, pi. lxviii. 
1840. Gyrodus gracilis, G. von Munster, Beitr. Petrefakt. pt. iii. p. 128, 
pi. xiii. fig. 2. [Immature fish ; Palaeontological Museum, Munich, 
and Woodwardian Museum, Cambridge.] 
