666 
ZOOLOGICAL LITERATURE. 
I. INFUSORIA. 
The most important work published on this class within the 
last year is^ without’ doubt. Part 2 of Stein’s ^ Infusionsthiere^ 
(/. c.) . In the general portion he treats in some detail of the 
composition of the body of the Infusoria, of the natural limits of 
the Infusoria, and their position in the animal kingdom’ (pp. 1-23) ; 
indications of a muscular system in the Infusoria (pp. 23-33) ; 
reflections on Ehrenberg^s latest defence of his theory of there 
being many stomachs in the alimentary tract of the Infusoria 
(pp. 33-40) ; on the sexual development of Infusoria, and criti- 
cism of BalbianPs theory (pp. 40-68) ; inquiry into the conju- 
gation of Infusoria (pp. 68-73) ; on the budding form of conju- 
gation (pp. 73-83) ; sexual development in OxytrichidcB, Euplo- 
tidce, and Paramecidce (pp. 83-99) ; some new inquiries into the 
sexual development in Vorticellidce and Trichodinidce (pp. 99- 
102) ; on the genera Amphileptus and Urnula, parasites on Vor- 
ticella-^idXk^ (pp. 102-109) ; tether observations on the budding- 
process &c. in Vorticella (pp. 109-112) ; the conjugation, sexual 
propagation, and embryonic development of Vorticella campa- 
nula j V. nebulifera, V. microstoma (pp. 112-118) ; Engelmann^s 
researches on the sexual propagation of Infusoria (pp. 118-125); 
latest researches into the sexual propagation of Vorticellidce ^ 
OphrydidcBy and Trichodidce (pp. 125-131) ; sexual propagation 
in Zoothamnium arbuscula irnd Epistylis plieatilis (pp. 131-138); 
probable sexual propagation in AcinetidcCy rejection of the ^ Aci- 
neta^ theory (pp. 138-140). 
In the special portion we have a revision of the principles of 
classification and a criticism of the systems of Claparede and 
Lachmann. The families and genera are placed under the four 
orders Peritricha, Hypotricha, Heterotricha^ and Holotricha, 
Order I. Peiutricha, Stein. 
1 Fam. Ophi'yoscolecina, St. Genera : OphryoscoleXj St. ; Entodinium^ 
St. 
2 Fam, Spirochonina St. Genua SpirocJiona, St. 
8 Fam. Ophrydina, E. Genera : Laymophrya, St. ; Cothurnia^ E. ; Va- 
ginicolaj E. ; Ophrydium^ E. 
4 Fam. VorticelUnaj E. Genera : Opercularia, E. ; Epistylisy E. ; Zoo- 
thamniumy E. j Carchesiumy E. ; Vorticellay E. ; Scyphiditty Lachm. ; 
Gerduy Clap. & Each. ; Astylozooti, Engelm. 
5 Fam. XJrceolarinay St. Genera : Urceolariay St. ; Trichodhiay E. ; 
TrichodinopuSy Clap. & Each. 
6 Fam. Oyrocoriday St. Genus Gyrocorisy St. 
7 Fa-m. Cyclodmeay St. Genera : JJrocentruniy E. ; Didiniumy St. ; Meso- 
diniumy St. 
8 Fam. Tintinnodeay Clap. & Each. Genera : TintinnuSy E. ; Tintin- 
nopsisy St. 
9 Fam. Halterinay Clap. & Each. Genera ; Halteriay Duj. ; Strom- 
bidium, Clap. &; Each. 
