THE GREEN ALGAE OF NORTH AMERICA 79 



priority . C. spiralis, however, seems nearer allied to C. Darwinii 

 (Hook.) Kiitz., which also has the upper cells subspherical, or 

 depressed-spherical, but C. spiralis is in all probability distinct 

 from the latter. It may be a question, however, if it is distinct 

 from C. moniligera Kjellman, iSgyb, p. 24, PI. IV, figs. 17-23, 

 also from Japan. 



Page 324, for C. ANTENNINA, substitute, 



C. MEDIA (Ag.) Kiitzing, 1849^.380; C. antennina Vick- 

 ers, 1908, p. 19, PI. VIII; Collins, 1909, p. 324; Borgesen, 

 I 9 I 3 P- l( >, figs. 4-5 ; Wittr. and Nordst., Alg. Exsicc., No. 

 1439 ; not Conferva antennina Bory ; Conferva media Agardh, 

 1824, p. TOO. Filaments deep or dark green, attached in dense 

 tufts, stiff and firm, up to 40 cm. high ; basal cell elongate, in- 

 creasing from 100-150 p. diam. at base to 300-400/1 at summit, 

 2-8 mm. long,, other cells 400-500 p diam., 2-6, mostly 3-4 diam. 

 long. W. I. Brazil. 



In the West India region this species corresponds to the at- 

 tached forms of C. Linum of the Atlantic coast from Massachu- 

 setts south, and of C. melagonium from Massachusetts north. 

 The cells are longer than in either of the two last species, and 

 the basal cell is more specialized. It has generally passed 

 under the name of C. antennina, but Howe, 1914, p. 37, states 

 from his examination of the type of the latter that it has a longer 

 basal cell, with a diameter at the top of 500-580 /u., and the other 

 cells are usually only 270-400 p. diam., and ^3-1^ diam. long. 

 C. antennina appears to be limited to the Pacific Ocean ; the 

 reference to Africa, Collins, 1909, p. 324, being an error. 



Page 325, after description of forma LINUM, add, 



CONFERVA LINUM Flora Dauica, Vol. V, p. 4, PI. DCCLXXI, 

 1782, appears to be the oldest name; therefore what we have 

 considered as a form, and which is a form from the biological 

 point of view, must stand as C. LINUM (Fl. Dan.) Kiitzing, 

 1845, p. 204, while the attached form becomes forma AEREA 

 (Dillw.) .. 



Page 326, after description of C. CHELONUM, add, 



9. C. CRASSA (Ag.) Kiitzing, 1845, p. 204; 1853, p. 19, Pi. 

 LIX, fig. II; P. B.-A., No. 1864; Borgesen, 1913, p. 18 ; 

 Conferva crassa Agardh, 1824, p. 99. Filaments 500-550 p. 

 diam., cells usually about as long as broad, occasionally up to 

 2 diam., wall thick. In loose masses in shallow water, W. I., 

 Bermuda. Europe. 



