INFUSORIA. 
Trot. 1 1 
General Anatomy, &c. 
The contractile vacuole is connected (25) with a “ vestibule ” and a 
“ reservoir,” which lie between it and the exterior in some Vorticella’. 
[Cf. Acineta rmjstacina^ supra.] 
Paranuclei : an asexual fission of them occurs in Spirocliona (27). 
Difference in nature of nuclei in Opalinm from those of other Infusoria 
(32) ; they being bags of liquid in this case, and more resembling cell- 
nuclei. 
Parasitism observed within VorticeJla microstoma and V. campanula, 
and in nucleus of Oxytricha, fallax (30). In this case, the parasites were 
probably some of the lower Thallophytes. They have no contractile 
vacuole ; they break up the nucleus while passing from the monad- to 
the cell-form, and cleaving ; nucleus may be extruded ; the parasites 
show vibratory motions when free. 
Distribution. 
Forel (antea,p. 9) mentions Ophrydium versatile, Carchesium polypinum 
Zoothamnium arhuscula, and Stentor cceruleus, from shallow parts of the 
Lake of Geneva, and Vorticella convallaria, from a greater depth. 
Gremma (10) mentions Acineta tuherosa, E., Colpoda pigerrima, Cohn, 
Nassula jflava, Cl., Euplotes charon, E., Stylonychia sp., Carchesium sp., 
as taken during his Aralo-Caspian researches. ” 
Carter (in “ Arctic and Antarctic Sponges,” vide Spongidd) mentions 
Ijogotia viridis and Frcia ampulla from Smith’s Sound, Capo Napolorm, 
50 fathoms. 
New Genera and Species. 
Peritricha. 
Tintinnus mitra, Gremma (10), p. 76, pi. ii. fig. 9. 
Epistylis steini, Wrzesniowski (31), Warsaw and Rugen. 
Zoothamnium cienhowshii, id. 1. c. p. 278, pi. xix. figs. 16 & 17, E. coast 
of Rugen. 
Hypotricha. 
Hclosticha, id. 1. c. p. 278. Based on the species of Ooiytricha which 
show continuous infra-ciliation. 
Oxytricha pernix, id. 1. c. p. 273, pi. xix. figs. 10 & 11. 
Oxytricha hessleri, id. 1. c. p. 275, pi. xix. figs. 12-15. 
Heterotricha, 
Climacostomum longissimtm, Gremma (10), p. 74, pi. ii. fig. 7. 
7'richonympha, Leidy (28), p. 147. T. nympha. Anterior part of body 
clothed with cilia of more than length of body ; no mouth observed. 
Habitat, intestine of Termes flavipes. 
Pyrsonympha, id. 1. c. p. 148. P. vertens. Perhaps a larval form of 
preceding ; no evident cilia or mouth. Habitat, as preceding. 
1877. [voL. XIV.] c 6 
