THE GENERAL SUBJECT. 
Prot. 2 
closes the aperture of the lorica when the animalcule is retracted. In- 
cludes P. pusilla, affinis, cartcri , spp. nn., and Cothurnia operculifera , 
5. -Kent, 1869, C. pyxidiformis, D’Udekem, C. furcifer , Hutton, C. socialis , 
Gruber. 
Pachytrocha, p. 729. Resembles Pyxicola, but fleshy pad is deve- 
loped beneath the peristome in place of a corneous operculum. For Pachy- 
trocha cothurnoides , sp. n., inhabiting fresh-water. 
Platycola , g. n., p. 731. Resembling Vaginicola, but lorica decumbent. 
Typo, V. decumhcns , Ehrenborg. P. longicollis , sp. n., also V. mollis , dila- 
tata , regularise truncata , striata , and gracilis, De Fromontol. 
Ophionella , g. n , p. 734. Allied to Ophrydium, but animalcules singly 
inhabiting a mucilaginous sheath. Type, O.picta , sp. n., fresh-water. 
Ophrydium sessile , sp. n., fresh-water. 
IIYPOTRICIIA. 
The Order Hyjwtricha is regarded as occupying the summit of the 
graduated scale of ciliate complexity, with relation to the diverse modi- 
fications and specialized character of the appendicular organs. 6 families 
are recognized, viz., 1. Litonotidce , S.-K. ; 2. Ghlamydodontidce , Stein, pt. ‘ r 
3. Dysteriidce , S.-K. ; 4. Peritromidce , Stein ; 5. Oxytrichidce, Ehrenberg ; 
6. Euplotidce , Ehrenberg. The members of the genus Glaucoma are 
regarded as representing developmental phases only of Aspidisca and 
other allied Hypotricha. The following new genera and species are 
described — 
Cypridium, g n., p 754. Includes Dysteria lanceolata, spinigera , acule- 
ata , and crassipes of ClaparMo and Lachmann ; all theso differ from tho 
typical Hysterics in tho simply tubular character of their pharyngeal 
armature. 
Plagiotricha , g. n., p. 771. Separated from Oxytricha with reference 
to the oblique distribution of the ventral setae. For 0. strenua, Engel- 
mann, and 0. affinis, Stein. 
Schizosiphon, g. n., p. 778. Animalcules resembling Stichotricha , but 
forming social colonics, and building up a compound zoothecium. Based 
on the Stichotricha socialis of Gruber. 
Opisthotricha , p. 785. Frontal, ventral, and anal styles as in Oxytricha , 
supplemented by a variable number of tail-like caudal setae. For Oxy- 
tricha parallela and 0. similis, Engelmann. 
Litonotus wrzcsniowslcii — L. folium, Wrczsniowski, nec Dileptus folium, 
Dujardin. 
TENT A CU LIFER A . 
The title of the Tenlaculifera introduced by Prof. Huxley (“ Anatomy 
of Invertebrata,’’ 1877) is here maiutained in place of that of the Suc- 
toria originally proposed by Claparede and Lachmann, in recognition of 
the fact that in many recently discovered members of the group, suctorial 
processes may be partly, or even altogether, wanting. The term Suctoria 
is at the same time retained for the distinction of that section or Order 
in which suctorial tentacles are represented, while that of Actinaria is 
