5S 



2. Northeastern sand area. About south end of Lake Michi- 

 gan and headwaters of Kankakee River in Ilhnois. 



3. Western and northwestern sand areas. In lUinois and 

 Mississippi river valleys, exterior to Wisconsin morainic border. 



4. Xorthern Prairie. Greater part of northern and central 

 Illinois, as far south as latitude of Wisconsin morainic border 

 in eastern Illinois. 



5. Southern Prairie. From the Northern Prairie to the Ozark 

 ridge. The life approaches that of the sand regions. 



6. The Ozark Ridge and River \'alley area. Life of south- 

 ern type, and of rough, rocky forested ground, extending up the 

 larger river valleys. 



7. Lower Austral zone. Area south of main Ozark ridge. 



"A CASE OF PHOSPHORESCENCE AS A MATING 

 ADAPTATION." 



T. W. Galloway. 



There appears periodically in certain waters of the Bermudas, 

 an annelid in which the phosphorescence is clearly a direct mat- 

 ing adaptation. 



The worms are never seen except at mating time. They ap- 

 pear at dusk, quite regularly for three to five days, at intervals 

 of approximately a month. 



The female swims at the surtace and is intermittently phosphor- 

 escent as the eggs are extruded. The males, which are deeper in 

 the water, are at once attracted, and copulation takes place with 

 wonderful uniformity and certainty. The males are somewhat 

 phosphorescent, but, so far as can be observed, this serves no 

 end in the mating. 



