COSMARIUM. 23 



plankton of Loch Bairness, Inverness ! Skye ! 

 Plankton of Loch Fadaghoda, Lewis, Outer Hebrides ! 



IRELAND.- -Xear Grlenties, Donegal ! Foxford and 

 Achill Is., Mayo ! Jar Connaught, and near Round- 

 stone, Gralway ! Carrantuohill, Kerry ! 



G-eogr. Distribution.- -Austria. Australia. 



We find this form much more abundantly than the type, 

 and in the smaller upland bog-pools it not infrequently 

 occurs in large quantity. It is one of the smallest forms of 

 the species and is well characterized by its broader isthmus 

 and rounded sinus. A punctate form of it is known from the 

 plankton of Loch Bairness, Inverness (i-ide West & Gr. S. West, 

 - Further Contrib. Plankton Scott. Lochs/ 1905, p. 499, t, 7, 

 f. 6) ; length 21-22 /z, breadth ll-5-13ju; breadth of isthmus 

 7-5 n (PI. LXVII, fig. 10). 



Forma elongata West & a. S. West, (PL LXXV> 



fig. 10.) 



C. moniliforme forma elongata West & G. S. West, Some Desni. U.S. 1898, 

 p. 311 [" lat. 11 /i " is a misprint for lat, 17 /T, t. 17, f. 14. 



Cells elongated ; semicells broadly elliptical with 

 the long axis longitudinal; vertical view circular. 



Length 38-42 /A ; breadth 17-20 p.; breadth of 

 isthmus 47 />c. 



IRELAND.- -Ballynahinch, Galway ! 



Geogr. Distribution.- -United States. 



Yar. subpyriforme var. not: (PL LXVII, fig. 5.) 



Semicells somewhat angularly obovate, lateral 

 margins in the lower part slightly flattened, and with 

 the apex also very slightly flattened. 



Length 40 p. ; breadth 20 p. ; breadth of isthmus 7*7 p.. 



ENGLAND.- -Xew Forest, Hants ! 



Var. limneticum var. nov. (PL LXVII, figs. 6, 7.) 



C. moniliforme forma panduriformis Heimerl forma 6 West & G. S. West, 

 Further Contrib. Freshw. Plankton Scott. Lochs, 1905, p. 500, t. 7, f. 4, 5. 



Cells often rather large, semicells very faintly pro- 

 duced at the apices which are slightly angular; isthmus 



