Prot. 1 
PROTOZOA. 
BY 
Stuart 0. Ridley, M.A., F.L.S., F.R.M.S. 
THE GENERAL SUBJECT. 
Chief Works. 
1. Maggi, L. Esame protistologico delle acque di alcuni laghi italiani 
Bo'l. scient. ii. [1880] p. 33. 
Gives classified lists of the Protista (including Bacteria 2 kndi DlatomacecBy 
up to Ciliata) of the Italian Lakes Briuzio, Yarese, Como, Pusiano, 
Annone, Garda, Idro, Candia ; and discusses the general aspects of the 
fauna and the geological causes which have brought Ceratium furca and 
Peridinium spiniferum into the lakes. 
2. . Primo esame protistologico delT acqua del Lago di Loppio 
(Trentino). Op. cit.m. 
Enumerates the leading species of Flagellata, Diatomncecr, and Cilio- 
Jlagellata of the Lake of Loppio in Trent, and mentions the occurrence 
of Oxytricha there. The marine form, Ceratium furca, = Peridinium 
lineatum, occurs here as in other fresh- waters. 
3. . Intorno ai Protisti ed alia lora classificazione. Op. cit. ii. p. 107, 
and iii. pp. 16 & 48. 
Distinguishes the Monera from Bacteria by the non-homogeueous cha- 
racter of their protoplasm, terming the ultimate elements composing 
the one class of organism ‘ metaplasson,’ and ‘ hetero- ’ or ‘ alloplasson,’ 
and those composing the other {Bacteria) ‘ protoplasson ’ or ‘ homoeo- 
plasson ’ ; an ‘ ectoplasson ’ and ‘ endoplasson,’ corresponding to ‘ ecto- ’ 
and ‘ endoplasm,’ occur in the former. These two forms of life are 
termed, morphologically, ‘ plastidules,’ in opposition to cells and cytodes. 
The various developments of these elements are made the subject of a 
philosophical discussion on the homologies of the Animal Kingdom in 
connection with the plastidule theory. 
4. . I Protisti e le acque potabili. Op. cit. iii. p. 79. 
Described as a preface to a course of lectures on the stndy of the 
Protista as connected with surgery and medicine. The author discusses 
