Royal Microscopical Society. 263 



collar and bearing a single attenuate flexible flagellum. Lorica 

 attached, sessile or pedunculate. Contractile vesicles conspicuous, 

 one or more in number. 



Saljpinffseca gracilis, Jas. Clk. (revised), PI. CV., 

 Figs. 9, 10, 11, 12. 



Lorica cylindrical, solitary or in groups ; expanding anteriorly, 

 attenuate, in the form of an elongate hollow peduncle, or abruptly 

 truncate posteriorly. Bodies of animalcules cylindrical, rounded at 

 the two extremities. Average length of lorica ^V to ^V mm., breadth 

 xso mm., animalcules occupying one- third to one-half the length of 

 its internal cavity. 



Hab. Fresh water. Pennsylvania, U.S., Jas. Clk. Stoke New- 

 ington, London, on Conferva, W. S. K. 



Salpingssca ampJioridium, Jas. Clk. (revised), PI. CV., 

 Figs. 13, 14. 



Lorica flask-shaped, having an inflated posterior portion and an 

 attenuate narrow neck, sessile, or attached by a short pedicle. Body of 

 irregular form, adapting itself to the outline of the lorica. Length 

 of the lorica y^-o nim., breadth of the expanded base ^^o t^^- 



Hab. Fresh water, attached to Conferva. Pennsylvania, U.S., 

 Jas. Clk. Stoke Newington, Loudon, W. S. K. 



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



Body enclosed within an ovate membranous lorica or sheath, 

 to the bottom of which it is attached through the medium of a con- 

 tractile ligament; no collar; one or two flagelliform appendages 

 originating from the anterior extremity. Lorica usually peduncu- 

 late. Contractile vesicles one or more in number. 



Bicosaica lacusiris, Jas. Clk, (revised), PI. CV., Figs. 15, 16. 



Lorica elongate oval, narrowing at the anterior extremity, at- 

 tached by a short pedicle. Body rounded posteriorly, rostrate 

 anteriorly and bearing a single flagellum originating excentrically, 

 curved and rigid in extension and a shorter stylate appendage. 

 Length of lorica t^o mm., breadth ^io i^m. ; body occupying one- 

 third to two-thirds of its internal cavity. Contractile vesicles two 

 in number. 



Hab. Fresh water, on Conferva. Pennsylvania, U.S., Jas. Clk. 

 Stoke Newington, London, W. S. K. 



Bicoseeca socialis, n. sp., PI. CV., Fig. 17. 



Lorica elongate oval, half as long again as that of B. lacusiris ; 

 pedicle not exceeding one-third or half its length. Body rounded 



u 2 



