434 



The Ohio Journal of Science [Vol. XIX, No. 8, 



mittently submerged for a longer period. The photograph 

 on page 433 indicates the character of the situation. It was 

 typical of the conditions along the east side of the pond. The 

 shore was perfectly bare rock. The water was between three 

 and four feet deep and contained an abundant growth of algae. 

 Table 2 presents a list of the species found in this region. 



TABLE 2. 



The total number of species for Station 2 is markedly fewer 

 than it was at Station 1. There were no Tricoptera or Sialidi- 

 dcB. The 'Species of coleopterous larvae were fewer, although 

 adult species were more numerous. Under the circumstances 

 we would of course expect larval forms to be at least less com- 

 mon if not entirely absent. The mere fact that larvae were 

 present does not of necessity mean they had developed here 

 from the egg, since they might have migrated from Station 1. 



The greatest variety of species was found among stones in 

 the littoral zone. At Station 1 this zone came next to the Char a 

 in point of numbers, which were one less than at Station 2. No 

 record was made at this station of the number of individuals 

 for each species. However, two counts of Physa were taken. 



