Lake Maxinkuckee, Physical and Biological Survey 95 



10. DINA FERVIDA (Verrill) 



A species mainly characteristic of the lake region of the north- 

 ern United States and southern Canada, represented in the collec- 

 tion from several points. The habits so far as known are essen- 

 tially similar to those of E. punctata. 



"Nov. 30, '00," eleven specimens ; "Long Pt., Nov. 1, '04," sev- 

 eral with D. parva and E. punctata, two have four pairs of eyes 

 like Verrill's type; "near Outlet, Dec. 13, 1904," two specimens; 

 "near Inlet, in Chara, 4-5 ft., Dec. 24, 1904," two specimens ; "near 

 Inlet, Dec., 1904", two. 



11. DINA PARVA Moore 



Little is known of this species, which was first taken in Minne- 

 sota and appears to be abundant in Lake Maxinkuckee. Nothing 

 is known of its habits. 



"Long Pt., Nov. 1, '04, with others," many specimens with D. 

 fervida and E. punctata; "Long Pt., Dec. 7, 1904," a large num- 

 ber, most of which are pigmented; "on shore on dead turtle and 

 shrew, Oct. 29, 1906," numerous small specimens. 



THE PROTOZOANS AND CCELENTERATES 



No special attention was paid to the Protozoa of the lake ; only 

 those forms were noted which thrust themselves upon our notice. 



The protozoan life of the lake is not conspicuous except for a 

 few forms which are found in such abundance as to attract atten- 

 tion. 



The list of species identified is a short one, not because these 

 organisms are rare at the lake, but because no one of the party en- 

 gaged in the study of the lake was especially interested in or fa- 

 miliar with them. An attempt was made to collect and preserve 

 all forms that attracted the attention, but these were naturally only 

 a small proportion of the species present. It so happened that 

 the plankton, which should have contained a number of these or- 

 ganisms, was submitted to two different experts, one interested in 

 Algse, the other in Crustacea, with the result that such Protozoa 

 as there were went by default. 



Forms of doubtful affinity, by some placed among Algse and by 

 others as animals, such as Peridinium, Ceratium and Volvox, are 

 included, Volvox especially exhibiting characters which strongly 

 suggest a position in the animal series. 



Following are our notes upon the few species identified : 



