﻿f)6 CHIMJEROTDEI. 



Ischyodus quenstedti, Wagner. 



1857. Chimcera (Ischyodon) quenstedti, A. Wagner, Gelelir. Anz. k. bay. 



Akad. vol. xliv. p. 288. 

 1862. Chimcera {Ischyodon) quenstedti, A. Wagner, Abh. math.-phys. 



CI. k. bay. Akad. Wiss. vol. ix. p. 280, pi. i. %. 1. 

 1887. Ischyodus quenstedti, J. Riess, Palaeontogr. vol. xxxiv. p. 6, pi. i. 



figs. 1-5, pi. ii. figs. 1-7. 



Type. Greater portion of skeleton ; Palaeontological Museum, 

 Munich. 



A species almost equalling i". toivnsendi in size, the trunk attaining 

 a total length of 1'5. Mandibular tooth with a gently wavy 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 Loc. 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. CI. k. 

 bay. Akad. 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. 



Hdberlein Coll. 



Ischyodus avitus (Meyer). 



1&60. Chimcera (Ganodus) prisca, H. von Meyer, Neues Jahrb. p. 212 



(name subsequently withdrawn) . 

 1862. Chimcera (Ganodus) avita, H. von Meyer, Palaeontogr. vol. x. 



p. 87, pi. xii. 

 1887. Ischyodus avita, J. Riess} Palaeontogr. vol. xxxiv. p. 14, pi. i. 



figs. 6, 7, pi. ii. fig. 8. 



