113 
latter var. he added some words (’?the frond is rough, 
with a few scattered and very minute granules’"), by 
which the description fits to fig. ' 8 f. in Brit. Desm. 
t. 4, but not to the fig. of ß truncatum, Ralfs’ not 
taking up his name ^truncatum’^ seems to prove, that 
he regarded figure and description of it incomplete 
or incorrect; and therefore this name ought not to 
be used. Ralfs’ ß in Brit. Desm. is called var. den¬ 
ticulatum by Kirch n. 
Cosmarium qtmdratum was established by Ralfs 
in Ann. Mag. Nat. Hist. 14 p. 395 t. 11 f. 9 a. 
dextra, a. sinistra and b (side view). These figures 
were copied in Hassall’ s Brit. Freshw. Alg. t. 86 f. 
11 and 12; fig. 12 is called •’Var.” in the explana¬ 
tion of the plates, but in the text p. 367 no such 
var. is described. (Fig. 12 b., which is a copy of 
Cosm. Cucurhita Ralfs 1. c., is sketched here by a 
mistake). In Brit. Desm. Ralfs did not add or change 
anything of importance in the description, but ”slightly 
protuberant” in stead of ”a single protuberance”. Fig. 
9 a. sinistra and 9 b. are reproduced on tab. 15 as 
fig. 1 c. (”var.” in explanation of the plate) and 1 b. 
If the fig. 9 a. dextra in Ann. Mag. corresponds to 
fig. I a. in Br. Desm., it is a good deal al¬ 
tered in conformity to the better description, which 
is not impossible, the figg. in Ann. Mag. not being 
very well executed (e. g., the original drawings were 
diminished on the plates). Lund ell, who had not 
seen Ann. Mag. N. H. 14, refers fig. 1 c. to his 
Cosm. sinuosum and Hassall’ s fig. 12 (with?) to his 
Cosm. binerve; but as Hass all’s fig. 12 is identical 
with Ralfs’ 9 a., there is left, in following Lundell, 
for the original Cosm. quadratum Ralfs 1844 only 
fig. 9 b., which represents the cell in side view; but 
this fig. 9 b. belongs certainly to the same species 
as fig. 6 a. Consequently there is no figure left for 
C. quadratum- sensu strict. and therefore, it is as well 
Bot . Not . 190r,. 8 
