Occasional Papers of the Museum of Zoology 9 



Table of Characters of Five Specimens of Cot tits ricci 



Lake Michigan Huron Superior 



Specimen (data given 



below) I 2 3 4 5 



Dorsal rays VIII, 17 VII, 17 VII, 16 VII, 17 VIII, 18 



Anal rays 13 14 13 13 I3 



Pectoral rays 17 16 16 16 16 



Depth (approxi- 

 mate) 5.7 7.0 7.0 5.6 6.7 



Head 3.35 3.2 3.3 3.25 3.0 



Eye 5-6 4-6 4-7 5-5 4-4 



Upperjaw 2.9 3.4 3.1 3.4 3.3 



Length of preoper- 



cular spine from 



angle of ridge, 



into eye l.o i.o i.o 0.8 i.o 



Length to base of 



caudal 87 43 48 41 33 



Prickles: Absent (i) ; weak, few below lateral line (2); absent 

 (3) ; coarse, extending one-third distance from lateral line to anal base 

 (4); coarse, investment complete (s). 



Data for Specimens Similarly Numbered in the Above Table 



I. — Mouth of Chicago River, Chicago, Illinois; collected by Emil W. 

 Youngren, March i, 1909; loaned by the Chicago Academy of Sci- 

 ences. 



2. — Lake Michigan, near Chicago, Illinois; deposited in the Field 

 Museum through the city water system, from the intake about two 

 miles out in the lake. 



3. — Lake Michigan, off Ludington, Michigan; collected by Dr. R. J. 

 Seymour; loaned by Mr, T. L. Hankinson. 



4. — Near Port Huron, Michigan, at the southern end of Lake 

 Huron; loaned by Mr. T. L. Hankinson. 



5. — Lake Superior, from west end of Ambre Harbor, Michipicoten 

 Island; collected by Dr. H. V. Ogden, September, 1901. 



