6 University of Michigan 



MKASURE-MEXTS OF ElCiJT LaKVAK ExI'RF.SSKD I.\ lIuXlJRKD'lilS 



OF Thfjr Total Lent.tiis. 



Catalog Xumber .... 483B4 ^8385 48386 48387 4838S 48389 48390 48391 

 Total length in milli- 

 meters 158 1-50 135 130 124 95 94 80 



Tip of snout to vent. . 72.47 69.67 70.37 69.24 68.55 73-68 73.41 74.38 

 Tip of snout to ante- 

 rior margin of dorsal 5,0.32 46.67 50.37 48.47 47.59 54.21 49-47 51. 8S 

 Last gill opening to 



vent 53.48 52.00 51.85 50.77 50.00 53.68 53- 19 53.13 



Last gill opening to 



anterior margin 



of dorsal 31-33 29.00 31.85 30.00 29.04 34.21 29.25 30.63 



Tip of snout to first 



gill opening 7.60 7.33 8.15 8.08 8.06 8.42 8.52 8.13 



Tip of snout to last 



gill opening 18.99 17.67 18.52 18.47 18.55 20.00 20.22 21.25 



Tip of snout to middle 



of dorsal-caudal 



notch 94.34 89-67 91-85 93.46 9^-74 89.47 90-43 9^-25 



Height of anterior 



dorsal 0.44 0.50 0.56 0.54 0.61 0.74 0.64 0.63 



Height of posterior 



dorsal 0.95 1.33 i..]8 1.54 1.61 1.58 1.07 1.25 



Width of body just 



behind branchial 



basket 4.75 5.00 5.19 5.00 4.84 5.27 5.32 5.31 



Depth of bod}' just 



behind branchial 



basket 5.70 6.00 6.67 6.16 6.05 6.32 6.65 7.19 



Length of oral opening 3.64 3.17 4.26 3.85 3.63 3.16 3.73 4.38 

 Muscular impressions 



between last gill 



opening and vent... 51 51 51 50 50 50 51 51 



Habits of Larvae: In ^i\\\ Creek, larvae occur most abun- 

 dantlv where eddies have deposited silt in concavities of the 

 stream bed, and where the current is slow. An admixture of 

 silt and sand seems to produce the most favorable situation, 

 although larvae were collected in small numbers from gravelly 

 and pure sand bottoms. Xone were found in stiff muck. An 

 idea of their aljundance in a very favorable locality may be 

 obtained from the fact that in an hour's dredging sixty-one 

 were collected from an area not larger than 5 x 10 feet. When 

 earth containing larvae is thrown from the dredge net to the 

 bank, individuals almost immediately wriggle to the surface. 



