Maskell. — On Freshwater Infusoria. 



61 



Length of lorica, exclusive of pedicle, 3^^ inch = 83 /x ; 

 width at margin ^i^ inch = 41 ;u ; length of pedicle, -^-^ inch 

 = 12 ^ usually, but reaching sometimes xyoo i^^h =; 16 u. 



Wellington, C. P. Poicles. 



The animalcule of this species very nearly resembles that of 

 A. grand is, Kent; but the form of the lorica separates it from 

 all described species. A. pocuhim, Hartwig, a saltwater infu- 

 sorian somewhat resembling it, has apparently a long pedicle. 



Acineta simplex, sp. nov. Plate V., fig. 12. 



Lorica wine-glass shaped, anterior edge not narrowed, lip 

 not reversed, posterior extremity rounded, sides nearly parallel ; 

 pedicle moderately stout, about twice as long as the lorica. 

 Animalcule occupying the anterior half of the lorica, sub- 

 spherical. Tentacles capitate, arranged in two groups of about 

 ten in each. Contractile vesicle situated on one side near the 

 anterior margin. 



Length of lorica, j^ inch = 50 yu 

 = 41 ^. 



Wellmgton, T. W. Kirk. 



Amongst the division of AcinetcB having the tentacles in two 

 groups, the nearest to this seems to he A. [/randis, Kent; but 

 the sizes differ greatly, the European species having a length of 

 to vV inch = 250 to 333 fi ; also its lorica tapers much 



width of edge, -^^ inch 



100 



more rapidly to the base, which is obtusely pointed. 



EXPLANATION OF PLATES. 

 Platk III. 



Fig. 11. Acineta elegans. 



Plate V. 



Fig. 12. Acineta simplex. 

 Fig. 13. Stentor gracilis. 

 Fig. 14. Stentor striatus. 

 Fig. 15. Trachelocerca filiformis. 

 Fig. 16. Pleuronema cyclidium. 



