234 



Chlorophycece 



R. botryoides (Schmidle) Lemm., forma quadriseta (Lemm.) Chod. is 

 known from the plankton of Lough Beg, Londonderry, Ireland ; diarn. of 

 cells 39-6 fi ; length of bristles 2360 p. ; fig. 102 B and C. 



Genus Lagerheimia Chodat, 1895. The cells are solitary, 



ellipsoid, or subcylindrical with 

 rounded extremities, and with a 

 firm cell-wall. There are four bristles 

 arranged in diverging pairs at each 

 pole, or disposed one at each pole 

 and two equatorially. Each bristle 

 has a wart-like thickening at its 

 base. There is a single parietal 

 chloroplast with one pyrenoid. The 

 multiplication is by autospores. 



L. subglobosa Lemm. is known from 

 Lough Gartan, Donegal, Ireland (diam. of 

 cells 5'5 9'4/x; length of bristles 10'5 

 13 p; fig. 103 D and E), and L. genevensis 

 Chod. from the south of England (diam. of 

 cells 3 p. ; length of cells 9 10 p, ; length of 

 bristles up to 16 p ; fig. 103 A 0). 



Genus Chodatella Lemmermann, 

 1898. This genus only differs from 

 the preceding one in the absence of 

 the swellings or wart-like thicken- 

 ings at the base of the bristles. 

 The cells are solitary, ellipsoid, and 

 furnished with four or many elon- 

 gated bristles, which are sometimes 

 radiating and sometimes curved. 

 There may be one or several parietal 

 chloroplasts, with or without pyre- 



Fig. 103. A C, Lagerheimia 

 genevensis Chod., after Chodat ( x 

 about 850). D and E, L. subglo- 

 frosaLemm.; D, after Lemmermann 

 (x520); E, from Lough Gartan, 

 Donegal, Ireland ( x 450). F and 

 G, Chodatella breviseta W. & G. S. 

 West, from Lough Gartan, Ireland 

 ( x 450). H and I, Ch. ciliata 

 (Lagerh. ) Lemm. var. amphitricha 

 (Lagerh.) Chod. (x450); H, from 

 Skipwith Common, E. Yorks. ; I, 

 from near Bowness, Westmoreland. 

 auts, autospores. 



noids. The genus differs from Oocys- 

 tis in the absence of the polar thickenings and the presence of the 

 long spine-like bristles. 



Ch. ciliata (Lagerh.) Lemm. var. amphitricha (Lagerh.) Chod. [ = Ck. 

 radians (West) Lemm.] occurs in several localities in the British Islands ; 

 length of cells 818 /x; breadth 413-5 M ; length of bristles 12 20 /x; fig. 

 103 H and I. Ch. breviseta West & G. S. West is known from Lough Gartan, 

 Donegal, Ireland; length of cells 12 12'5/x; breadth 8 9'5/x; length of 

 bristles 11-5 17"5 M ; fig. 103 F and G. 



