69 



Corvlhi'olchtliys Danckcr, in Fauna Siid- 

 west Australiens, Pisces, 1909, p. 237. 



Corythokhihys Dunckcr, Mitt. a. d. 

 natmh. Mus. Hamburg XXXII. 1915, 

 p. 72. 



Body short, rather stout. 

 Shields rough, with the edges 

 more or less prominent and 

 smooth, slightly crenulated, by 

 exception serrated. Snout slen- 

 der, straight, equal to postorbi- 

 tal or remaining part of head; 

 its ventral profile forming a 

 straight line with ventral pro- 

 file of head ; its dorsal profile 

 abruptely rising to orbits, which 

 are prominent. The dorsal pro- 

 file of the head rising abruptely 

 in its orbital part, forming an 

 angle with the snout; the front 

 and eyes prominent. Occiput 

 and nuchal shields with a 

 distinct median, more or less 

 scalloped crest. Supraorbital 

 ridges continued on occiput. 

 Operculum crossed by a com- 

 plete longitudinal keel. Supe- 

 rior cristae of tail and trunk 

 discontinuous; inferior cristae 

 of trunk and tail continuous; 

 median cristae of trunk and 

 superior cristae of tail subconti- 

 nuous. Intermedial shields (scu- 

 tella) present as also a prae- 

 nuchal and one nuchal shield. 



the name Coryth'dichthys of Kaup ought 

 to be changed. Dumkril has already 

 shown that it was derived from x^pt/$, 

 t/o? helmet and <%5r:/; fish and therefore 

 more correct than the innovation of 

 Jordan & Snyder. 



Fig. 30. 



Corythoichthys crcnulatits M. Web. 



X 4- 



