Protozoa and Rotifera at Havana, III. 335 



Section Oligotmcha. 



Family HALTERIIDiE. 



Strombidium C. & L. 



Free-swimming, colorless, yellowish, or green, usually 



persistent in shape, globose, pyriform, or urceolate, usually 



narrowed or pointed behind ; anterior end convex, encircled 



by the adoral zone, the oral end of which follows a ventral 



excavation back to the mouth-opening towards the middle of 



the body ; without cilia except a few on the ventral surface, 



either irregularly scattered or in a short oblique row. 



70. S. claparedi Kent. 



Rare ; taken in September and December in the river and 

 Thompson's Lake. 



Halteria Duj. 



Free- swimming, colorless, persistent in shape, more or less 

 globose, anterior end feebly convex, adoral zone about as in 

 Strombidium, to which the genus is closely allied. Surface 

 with a number of long stiff bristles or springing hairs, irregu- 

 larly scattered or gathered into an equatorial zone. By 

 means of these bristles the animal progresses with a succes- 

 sion of quick springing or leaping movements, as indicated 

 by the name of the genus. 



71. H. grandinella 0. F. Mull. 



This peculiar species was of frequent occurrence from June 

 to September, and a few were seen in January and February. 

 It was very generally distributed. 



Family TINTINNID^. 

 Tintinnopsis Stein. 

 Lorica chitinous, usually campanulate, structureless ; nu- 

 merous foreign particles imbedded in its outer surface, mostly 

 grains of sand. 



72. T. illinoisensis Hempel ('96).* 



Found in April and May, in company with Codonella cra- 

 tera, in towings from the Illinois River, Thompson's Lake, 



♦Subsequent studies by Dr. Kofoid indicate that this form is not specifically dis- 

 tinct from Tintinnidiumjluviatile Stein. 



