new Infusoria from American Fresh Waters. 449 



the specific name. I have not observed the act of reproduction ; 

 but the presence of two individuals in one lorica suggests 

 fission or budding, the usual method in the order being by the 

 formation of a ciliated embryo. In another remarkable 

 undescribed species of this genus reproduction takes place by 

 encystment and the subdivision of the entire body into bifla- 

 gellate organisms. As I have thus far seen this form only 

 in its encysted condition, I prefer to observe the arrangement 

 of the tentacles before describing it. 



Acineta, urceolata, sp. nov. (PI. XV. fig. 7.) 



Lorica urceolate, widest and compressed anteriorly, the 

 walls thin, readily taking the form of the enclosed animalcule, 

 the posterior extremity continued as an attenuate, very short, 

 hollow pedicle one eighth to one tenth as long as the lorica, 

 the frontal margins separated by a narrow cleft-like fissure, 

 widened and rounded at the lateral borders ; enclosed body 

 almost filling the cavity of the lorica, and attached to it 

 posteriorly by a prolongation continued through the pedicle ; 

 endoplasm granular ; tentacles capitate, a fascicle issuing from 

 each lateral angle of the anterior fissure ; nucleus oval ; con- 

 tractile vesicle spherical, single. Length of lorica, including 

 pedicle, ^fo inch. 



Hah. Standing water, with various aquatic plants. Tren- 

 ton, New Jersey, U. S. A. 



EXPLANATION OF PLATE XV. 



Fig. 1. Stylonychia notophora, X 480. 



Fig. 2. Opisthotricha emurginata, X 500. 



Fig. 3. Urostyla trichogaster, X 187. 



Fig. 4. Podophrya brachipoda, X 480. 



Fig. 5. Solenophrya inclusa, x 480. 



Fig. 6. Solenophrya pera, X 420. 



Fig. 7. Acineta urceolata, X 480. 



Fig. 8. Tillinajtavicans, X 550. 



Fig. 9. Tillina injlata, X 550. 



Fig. 10. Lacrymaria truncata, X 280. 



Fig. 11. Anisonema emurginata, x 1000. 



Fig. 12. Entosiphon ovatus, X 900. 



Fig. 13. Colpidium truncatum, x 450. 



Fig. 14. Petalomonas carinata. Transverse section- 



Diagram. 

 Fig. 15. Zygoselmis acus, X 1350. 

 Fig. 16. Heteromila mutabilis, X 1200. 

 Fig. 17. Vorticella octava, :< 000. 



