262 Transactions of the 



amended in accordance with the author's personal experience. 

 Without exception the material furnishing these descriptions was 

 obtained from a pond of moderate dimensions on the estate of 

 Thomas Kandle Bennett, Esq., of Wentworth House, Stoke 

 Newington. 



CODOSIGA, Jas. Clark (revised). 



Bodies of animalcules ovate, one or a number seated at the ter- 

 mination of a fixed, slender, unretractile, simple or branching pedicle ; 

 the anterior and distal portion bearing a membranous, infundibular, 

 retractile collar ; the single attenuate, flexible flagellum originating 

 from the centre of the area which it circumscribes. Contractile 

 vesicles conspicuous, one or more in number. Increasing by longi- 

 tudinal fission. 



Codosiga ])uhherrima, Jas. Clk. (revised), PI. CV., Figs. 6, 7. 



Animalcules from one to as many as eight or nine in number, 

 attached to the primary pedicle through the medium of very short 

 secondary ones; surface of the body smooth, length of the same, 

 exclusive of the collar, ^ho J^am. (2 sVtf Eng. inch), breadth -^wu '^'^- 5 

 length of the primary pedicle, four or more times that of the body, 

 of the secondary ones about half its diameter. Contractile vesicles 

 conspicuous, two or more in number. 



Hab. Fresh water, attached to Myriopliyllum and Conferva. 

 Pennsylvania, U.S., Jas. Clark. Stoke Newington, London, 

 W. S. K. 



Codosiga echinata, n. sp., PI. CV., Figs. 1, 2. 



Similar to C. imlcherrima, but the individual animalcules having 

 the surface of their body beneath the collar beset with verticels of 

 evenly-disposed sty late processes. Length of the body t^tj- mm., 

 breadth -^ mm. 



Hab. Fresh water, on Myriophyllum and Conferva. Stoke 

 Newington, London, W. S. K. 



Codosiga unibellata, n. sp., PI. CV., Figs. 3, 4, 5. 



Bodies of animalcules similar in structure to those of C. pul- 

 cherrimus, but of double the length (^^^j mm.) and more elongate 

 outline, seated in groups at the terminations of a rigid tripartite, 

 bi-tripartite, or occasionally quadri-partite, branching pedicle. 



Hab. Fresh water, on Myriophyllum and Conferva. Stoke 

 Newington, London, W. S. K. 



SALPING^CA, Jas. Clk. (revised). 



Animalcules inhabiting a transparent lorica or sheath, the ante- 

 rior portion of the body provided with a membranous retractile 



