1886.] 



MICEOSCOPICAL JOURNAL. 



85 



ovate ; pharyngeal passage long, tub- 

 ular, curving toward the right-hand 

 side and extending to the centre of 

 that border, apparently ciliated ; nu- 

 cleus band-like, convolute, subcen- 

 tral ; contractile vesicle posteriorly 

 placed, with a channel like 

 diverticulum extending to the 

 centre of each lateral border ; 

 endoplasm colorless, trans- 

 parent, or containing numer- 

 ous dark granules ; anal ajDer- f " 

 ture in close proximity to the^^ ^^ 

 conti"actile vesicle. Length 

 of body j\^ to_ gJ^) inch- 

 Habitat. — Standing water 

 with decaying vegetation. 



Occasionally a posteriorly 

 developed emargination is 

 temporarily developed, due 

 probably to the position of 

 the anal aperture. Conju- 

 gation has been frequently 

 observed, union taking place 

 by means of a poitionof the 

 antero-ventral region, and ap- 

 parently involving the oral 

 aperture, the zooids then 

 swimming with the ventral 

 surfaces parallel. No trace 

 of the animal chlorophylle 

 which so crowds the subcuti- 

 cular region of A. emargi- 

 iiata Stokes, is here visible, 

 the endoplasm being almost 

 hyaline. 



Strombidinopsis acumi- 

 nata^ sp. nov. (Fig. i6). 



Body elongate-ovate, sul)- 

 cylindrical, slightly con- 

 stricted anteriorly, less than 

 three times as long as broad, 

 somewhat gi1)bous posteri- 

 orly, that extremity termi- 

 nated by a short, conspicu- 

 ous, eccentric acumination ; an- 

 teriorly somewhat laterally curved, 

 the frontal border centrally elevated, 



the oral aperture surrounded by a 

 slight depression and followed by a 

 conical, longitudinally plicate pha- 

 rvnx ; adoral ciliary wreath circular, 

 the cilia but slightly longer than those 

 of the general surface ; contractile 



New Fresh-water Infusoria.* 



\csicle near the posterior extremity ; 

 endoplasm granular. Length of body 

 4 \~^ ^^ e^lo^ inch. Habitat. — Standing 



Fig. 1,2. Physoiuonas etotigata. 

 F^'g 3. 4> 5- Tetriitnitus variubLh. 

 Fig. 6, 7 Urceolus sabulnsus. 

 Fig. 8 Chrysopyxis triangulnris. 

 Fig. 9. Ck. macrotriichela.. 

 Fig. 10. Ch. ampuUacea. 

 Fig. II. Prorodon limnetis. 



Explanation of figures. 



Fig, J2. Trachelophyllum clavatunt. 

 Fig, 13. Perispira strophosoma. 

 Fig. 14. Lacryniaria teres. 

 Fig. 15. Leucofihrvs curvi/ata. 

 Fig. 16, Strombidinopsis acuminata. 

 Fig. 17. Vorticella Floridensis. 

 Fig. 18. Cothurnia Canthocampti. 



