334 DISCOVERY REPORTS 



Asterionella notata Grunow ex Van Heurck. 



Van Heurck, 1881, pi. 52, fig. 3. 

 Gran, 1905, p. 119. 



Cells united to form irregular elongated chains, adhering by their thickened ends, 

 usually radiating about a common axis, but sometimes arranged about more than one 

 axis. Valves slightly broader at one end, tapering gently to a fine point at the other. 

 A faint median pseudoraphe present. Girdle simple. Chromatophores : numerous 

 cocciform bodies. Apical axis of cell, 60-96/x. Type locality Honduras. 



A neritic species common in the warmer water of the southern hemisphere. 



Observed at St. 1373. 



Genus Synedra Ehrenberg 



Ehrenberg, 1830 



The name Synedra was used first by Ehrenberg in 1830 in the following manner 

 (p. 40): "Synedra nov. Gen. affixa pedicellata saepe dichotoma, apica dilatata." 



As far as I can ascertain no species was described under this generic heading in 

 the 1830 publication quoted above. In 1832 Ehrenberg 1832, p. 86 described five 

 species of Synedra under the following epithets : S. fasciculata, S. lunaris, S. bilunaris, 

 S. balthica, S. Vina. 



In Infusionsthierchen, 1838, p. 210, Ehrenberg redescribed the genus and added de- 

 scriptions of six species, which included those previously described in 1832, either 

 retaining them with specific rank, or placing them in the synonymy of new combinations 

 there described for the first time. Synedra baltica was placed in the synonymy of 

 Synedra Gallionii, which was based on Navicula Gaillonii of Bory (Encyclopedie 

 me'thodique, 1824). Synedra lunaris and Synedra bilunaris subsequently were trans- 

 ferred to the genus Eunotia by Grunow in Van Heurck's Synopsis (pi. 35, 1881). As 

 there appears to be some doubt as to the identity of Synedra fasciculata Ehrenberg, 

 I consider Synedra ulna Ehrenberg as the type of the genus. 



Synedra auriculata Karsten. 



Karsten, 1906, p. 173, pi. 30, fig. 18. 

 Skvortzow, 1931 b, p. 112, pi. 10, fig. 2. 



Cells very long and narrow, often matted together in dense masses. The diameter of 

 the cell is uniform throughout the greater part of the length, but decreases slightly a 

 short distance from the slightly inflated apices. Apices rounded. Median pseudo-raphe 

 prominent. Short transverse striae present throughout the whole length of the cell, a 

 little more closely arranged towards the apices than in the middle area. Chromato- 

 phores: numerous cocciform bodies. Apical axis of cell 800-1200/x, transapical axis 

 4-6/x. Type locality, off the coast of South Africa. 



Observed at St. WS481. 



