521 
Hodgetts. — A New Species of Spirogyra. 
starch-grains. Not infrequently certain individual cells of a filament are 
curiously coiled, making \-i turns, although otherwise quite normal, and 
sometimes observed in conjugation. Photos 4, 6 , and 7, PI. XXII, show 
examples of these coiled cells. Coiling of the filaments of various fila- 
mentous Algae has been recorded by W. and G. S. West, the specimens 
H -shaped connecting-clamp between contiguous pairs of cells (the process is described in the text), 
x 500. (Somewhat diagrammatic.) 
Text-fig. 4 Spirogyra colligata, sp. nov. Ends of two contiguous cells which have been 
pulled apart, showing the H -shaped clamp-connexion retained on the end of the left-hand cell. The 
gelatinous sheath with its fibrillar structure is shown (in the other figures it has been omitted).* x 500. 
(Somewhat diagrammatic.)' 
Text-fig, 5. Spirogyra colligata, sp. nov. Terminal conjugation. Only the end of the empty male 
gametangium is shown. x 400. (Somewhat diagrammatic.) 
occurring in the plankton of lakes, and the coiling considered to be 
* a limnetic character developed to augment the floating capacity of the 
filament \ l This view can hardly be applied to the coiled cells of the 
present Alga, since the filaments occurred, amongst other . filamentous 
forms, at the shallow margin of a pond, and generally in less than 12, inches 
of water. Moreover, in the present case the coiling was generally limited 
1 W. and G. S. West, in Proc. Royal Soc., B., vol. lxxxi, 1909, p. 195. Coiled filaments have 
been recorded in species of Mougeotia , Anabaena, Lyngbya , and Melosira . 
