284 



NORTHERN ZOOLOGY. 



Dimensions. 







No 



• 1, 



Nc 



.2. 



Dr.Gaird- 



ncr's 

 measurem. 







lu. 



Lin. 



In. 



Lin. 



In. Lin. 



Lengtr 



from tip of snout to extremity of tail 



27 







23 



6 



54 



a 



„ curvature of tail (excluding caudal) 



22 



G 



19 



2 



45 



a 



,, end of dorsal .... 



19 



81 



17 







39 



a 



„ end of anal .... 



19 



6 



17 



3 



38 9^ 



t> 



„ beginning of dorsal . . 



17 



1 



14 



91 



33 0* 



a 



,, anus ..... 



15 



H 



14 



2 



33 



)> 



„ end of ventrals 



15 







13 



?i 







a 



, f beginning of ditto 



14 







12 



71 



29 



a 



„ nape including first dorsal shield 



6 



2 



6 











it 



,, nape excluding ditto 



5 



3 



5 



2 



11 



» 



„ pectorals ..... 



5 



9 



5 



9 



12 



it 



„ posterior edge of gill-openings . 



5 



9| 



5 



8 







3> 



,, edge of operculum 



5 



7 



5 



41 



10 1 



J) 



,, temporal spiracles . 



3 



10 



3 



8 



6 7 



JT 



„ posterior edge of orbit 



2 



H 



2 



lOf 







?l 



„ anterior ditto .... 



2 



3 § 



2 



6 







11 



,, posterior end of vomer . . 



2 



4 i 



2 



61 







J? 



„ angle of posterior sub-orbitar 



3 



2 



3 



31 







„ 



„ superior nasal orifices . 



1 



81 



1 



91 



2 7 



J) 



of pectorals ....... 



4 







3 



4 



7 



)> 



ventrals ........ 



2 



2 



1 



7 



4 4 



)1 



attachment of ditto ..... 



1 



2 



1 













attachment of anal ...... 



1 



4 



1 







2 8 



it 



its longest rays ...... 



2 



4 



2 







4 



it 



attachment of dorsal ...... 



2 



7 1 



2 



2 



6 



it 



its longest rays ...... 



2 



3" 



1 



81 



3 



It 



longest lower rays of caudal .... 



3 







2 



7 







» 



lower lobe of ditto ...... 



3 



6 



3 



1 



5 



tt 



upper lobe of ditto ...... 



5 



10 



5 



2 







Breadth of pectorals ....... 



2 



9 



2 



7 



5 5 



tt 



between nostrils — upper orifices .... 



1 



2 



1 



2 



2 5 



tt 



between eyes ....... 



1 



91 



1 



9 



3 6 



tt 



between anterior orbitar bones ..... 



2 







1 



10 



3 9 



t> 



between temporal spiracles ..... 



2 







1 



10 



3 9 



n 



between surfaces of scapular bones .... 



2 



7 



2 



4 







Circum 



ference of body where thickest .... 



9 







8 







18 



[118.] 2. Acipenser rubicundus. (Le Sueur.) Ruddy sturgeon. 



Acipenser rubicundus. Le Sueur, Ph. Tr., Philad., New Series, i., p. 388, pi. 12. 



This sturgeon, which was very imperfectly known to Pennant and other writers 

 who have mentioned Canadian animals, was first established as a distinct species 

 by M. Le Sueur, who found it in lakes Ontario, Erie, Huron, and Michigan. 

 The individuals inhabiting the three latter sheets of water are of course cut off 



* This measurement was probably made by Dr. Gairdner to the anterior edge of a shield incumbent on the dorsal 

 which is nearly opposite to the posterior verge of the vent. 



