66 
CHIMiEROTOEI. 
Ischyodus quenstedti, Wagner. 
1857. Chimcera ( Ischyodon ) quenstedti, A. W agner, Gelehr. Anz. k. bay. 
Akacl. vol. xliv. p. 288. 
1862. Chimcera ( Ischyodon ) quenstedti , A. Wagner, Abh. matli.-pliys. 
Cl. k. bay. Akacl. Wiss. vol. ix. p. 286, pi. i. fig. 1. 
1887. Ischyodus quenstedti, J. Riess, Palaeontogr. vol. xxxiv. p. 6, pi. k 
figs. 1-5, pi. ii. figs. 1-7. 
Type. Greater portion of skeleton; Palaeontological Museum, 
Munich. 
A species almost equalling I. townsendi in size, the trunk attaining 
a total length of 1*5. Mandibular tooth with a gently wav}" oral 
margin, a short post-oral margin almost parallel to the symphysial, 
and the beak short; anterior and posterior outer tritors small, 
undivided; median tritor large, extending backwards from a point 
in advance of the anterior outer tritor, and only separated from the 
posterior outer tritor by a very narrow space. Palatine tooth with 
each of the tritors well developed, except the median, which is very 
small; none subdivided. 
Form. Sf Log. Lower Kimmeridgian (Lithographic Stone) : 
Bavaria. 
38005. Plaster cast of dorsal fin-spine of the type specimen, de¬ 
scribed and figured by Wagner, Abh. math.-phys. Cl. k. 
bay. Akacl. Wiss. vol. ix. pi. i. fig. 1; Eichstadt. 
Purchased , 1864. 
37021. Remains of the head and anterior portion of the trunk of a 
male individual of moderate size, preserved in counterpart 
slabs, and displaying the dentition, frontal spine, and 
dorsal fin-spine ; Solenhofen. The teeth are considerably 
crushed and not one satisfactorily exhibits the oral aspect. 
The frontal spine is also crushed, but evidently large, 
broad, widening proximally, and provided in the distal 
half with a tuft of recurved, subulate denticles. The 
dorsal spine resembles that already figured by Wagner. 
H'dberlein Coll. 
Ischyodus avitus (Meyer). 
1860. Chimcera (Ganodus) prisca, H. von Meyer, Neues Jahrb. p. 212 
(name subsequently withdrawn). 
1862. Chimcera (Ganodus) avitci, H. von Meyer, Palaeontogr. vol. x. 
p. 87, pi. xii. 
1887. Ischyodus avitci, J. Riess, Palseontogr. vol. xxxiv. p. 14, pi. i. 
figs. 6, 7, pi. ii. fig. 8. 
