8 Prot , 
PROTOZOA. 
either vacuolated or reticulated. The group appears to present more 
affinities to Heliozoa than to any other Protozoa. 
Fodophrya, sp. indet., (12) p. 303, pi. xx. fig. 5. 
- Fodophrya fixa, var. algirensis, 1. c. p. 308, = P. libera^ Perty. 
Hemiophrya^ Kent. Defined by Maupas, (12) p. 323. It should con- 
tain Fodophrya gemmipara, and five other species. 
Hemiophrya gemmipara^ 1. c. pi. xx. figs. 16 & 17. Maupas confirms 
Hertwig’s statement of the penetration of the tentacles into the body. 
This is the species described by Eobin as P. lijnghii. 
Acineta mystacina, (9) p. 533, pi. ix. figs. 1-18, figured as A. mystacina, 
var. carchesii. In destroying the Vorticellids, it attaches itself to their 
stems, and will kill individuals of twice its own size. Fission begins by 
the nucleus dividing into halves, and producing two vacuoles; the 
protoplasm then itself divides, and the halves separate ; one half and 
one vacuole are generally larger than the others, and appear usually to 
divide again into two. Suckers are emitted by the fission-products before 
they separate. 
Acineta mifulae^ Mereschkowsky, (13) p. 215, pi. xii. fig. 11. A. divisa, 
Fraipont, is perhaps only a variety of this species. 
Acineta^ (13) p. 217, list of the described marine species. 
New Genera and Species. 
Peritricha. 
The following genera and species are described as new by Kent, (10) 
pp. 621-720, pis. xxxi.-xl., with references to pi. xlix, in pt. 6 (1882). — 
[Kent deals with some accepted Peritrichous genera, as Heterotricha, 
below] : — 
Petalotricha, p. 627. Based on Tintinnus ampulla and spiralis, Fol. 
Differs from Tintinnus in restriction of cilia to distal area, and their 
abnormal arrangement in two heterogeneous series, the one upon lappet- 
like projections of the peristome. 
Arachnidium, p. 637. Differs from Mesodinium in the absence of the 
supplementary leaping setae, and in having the oral circle of cilia 
developed into long tentacular processes. Found in salt and freshwater. 
Includes A. globosum, convolutum, spp. nn., and Halteria bipartitum, 
Fromentel. 
Telotrochidium, p. 643. Based on Vorticella crater if or mis, Muller. 
Free-swimming; two circles of cilia; mouth-opening behind anterior 
circle ; arms posterior ; increasing by longitudinal fission. Freshwater. 
Scyphidia fromentelli. 
Spirochona tintinnabulum. 
Stylochona, p. 662. Differs from Spirochona in possession of distinct, 
rigid pedicles. Marine, S. nebalina, coronata. 
Rhabdostyla, p. 664. Differs from Vorticella in rigidity and non •• 
contractile character of the pedicle. Freshwater, R. sertularium, longipest 
spp. nn., and Epistylis brevipes, Claparede & Lachmann, &c. 
Pyxidium, p. 666. Differs from Opercularia in having the individuals 
solitary. Freshwater. Based on P. cothurnoidea, sp. n., and Scyphidia 
inclinans, Miiller. 
