





PERCOIDEjE. 





• 





2< 









Dimensions 















Of the Lake Huron specimen. 











I 



riches 



Lines. 







Inches. 



Lines 



Length 



from tip of lower j aw to end of caudal 







Length 



of longest dorsal spine . 



. 



1 







fin 





8 



6 



j> 



„ soft rays of dorsal 



. 



1 



4 



jj 



„ upper jaw (protruded) to 







jj 



pectorals . 



. 



2 







end of scales on middle caudal rays 



7 







JJ 



first spinous ray of ditto 



. 







10J 



., 



,, anus .... 



4 



6 



JJ 



spine of ventrals . 



. 



1 







j» 



„ „ anal fin 



4 



9 



» 



soft rays of ditto . 



. 



1 



6 



>! 



„ „ dorsal . 



3 







JJ 



attachment of anal . , 



. 



1 



5 



V 



,. „ orbit . 







7i 



'2 



JJ 



third anal spine 



. 







11 



JJ 



x „ „ tip of gill-cover 



2 



5 



5J 



soft rays of anal 





1 



4 



„ 



„ chin to ditto . 



2 



7 



JJ 



longest caudal rays 





1 



3 



JJ 



and breadth of orbit . . 







6* 



JJ 



central ditto 



. 



1 



5 



JJ 



of intermaxillary 







8* 



J) 



tail from behind dorsal and 



anal 







JJ 



labial .... 







8* 



fins to base of caudal 



. 



1 



8 



JJ 



lower jaw .... 







11 



jj 



„ to extremity of ditto . 



3 







JJ 



attachment of dorsal 



3 



5 



Greatesi 



height of body 



. 



3 



9 



JJ 



., of spinous part of ditto 2 



2i 



Diameter of tail, vertically, at base of caudal 







11 



[9.] 1. Trichodon Stelleri. (Cuvier.) Steller s Trichodon. 



Family, Percoideae. Genus, Trichodon. Cuvier. 



" Trachinus trichodon. Pall., Zoogr.,t. iii., p. 235." Tilesius, Mem. de Petersb., 



iv., p. 466, PI. 15, f. 8. An. 1813. 

 Le trichodon de Steller ( Trichodon Stelleri). Cuv. et Val., iii., p. 154. 

 Anamchlyk. Aleutians. 



The genus Trichodon, first indicated by the unfortunate Steller, stands in Cuvier s 

 system among the Thoracic Percoidece, which have five soft rays in the pectorals, 

 fewer than seven branchiostegous rays, and two dorsals. Pallas and Tilesius, 

 suppressing Steller's genus, ranged the only known species as a Trachinus, or 

 Weever ; but the Weevers in the Baron's scheme of arrangement are Jugular 

 Percoidese, and have besides the operculum armed with a remarkable spine ; while 

 in Trichodon that bone ends in a flat point, and the preoperculum is armed with 

 four or five strong spines. The lateral direction of the eyes distinguishes Trichodon 

 from another genus of the same division with, the Weevers, namely, Uranoscopus, 

 to which its flat head and vertical mouth give it a resemblance. The position of 

 its ventrals again under the pectorals, and the want of scales, seem to ally it to 

 Cottus ; but its cheeks are not mailed by the sub-orbitars, which form only a 

 narrow border to the orbit. 



The only Trichodon hitherto discovered inhabits the most northern part of the 

 Pacific, being found both on the American and Kamtschatdale coasts, and abound- 

 ing particularly at Unalaschka. It resembles the Weevers in its habits, buries 

 itself in the moist sands at low water, and is dug up by the natives with their 



