Algae of the English Lake District. By Wm. West. 735 
Genus Cylindrocapsa Reinsch. 
C. conferta sp. n. Figs. 40-42. 
C. cellulis indivisis quadrato-ellipsoidicis, fere latius quam 
longius, confertis, cum tegumentis hyalinis circiter binis 
circumvelatis. 
Lat. cell. 21-26 fa ; long. cell. 12-20 fa ; diam. tubul. 
24-30 fa. Bn. 
The cells bad very firm walls and were filled with intensely green 
granulose contents. The crowded subangular cells seem to dis- 
tinguish this from any other species hitherto described. 
Genus Sciadium A. Br. 
S. arbuscula A. Br. Bn., Crummock Water. 
Genus Opliiocytium Nag. 
0. cochleare (Eich.) A. Br. B., Bn., R., Hk., Crummock Water. 
*0. majus Nag. Bn. 
Genus Dictyosphaerium Nag. 
D. Ehrenbergianum Nag. Bn., Angle Tarn, Crummock Water. 
D. reniforme Buln. Bn. 
Genus Dimorphococcus A. Br. 
D. lunatus A. Br. Long. cell. 12-17*5 fa; crass, cell. 6*5- 
7*5 fi. Fig. 39. Bn. Scenedesmus radiatus Reinsch (Algenfl. 
des Mitt, von Frank., p. 81, t. vi. f. vi.) is probably a smaller form of 
this species, with more rounded apices. 
Genus Tetracoccus gen. n. 
Cellulae parvse, globosae vel subglobosae (nonnumquam 
subangulares), virides, regulariter quaternae et propinquae, 
familias parvas irregulares, libere natantes, forma ntes, cellu- 
larum 20-80 ; subfamilia singula quaterna Hlis delicatis 
hyalinis subcurvatis sublaxe conjuncta, non-radiatim (forsan 
reliquae membranarum cellularum seniorum) ; contentum 
chlorophyllosum cellularum cum granulis magnis paucis ; pro- 
pagatio cellularum divisione planitiei in duas directiones alter- 
nans, et atque fit cellulis filialibus quattuor in cellula matri- 
cali ortis. 
T. botryoides sp. n. Figs. 43-48. 
Character idem ac generis. 
Diam. cell. 3 *8-5 *7 fa; diam. famil. 30-57 fa. Bn., not 
unfrequent. 
The nearest genus to this is Dimorphococcus A. Br., but this 
genus has its quaternate cells of two forms, which character gives 
rise to the generic name, and the four cells composing these dimorphic 
groups are somewhat irregularly joined together by short, broad , 
hyaline processes ; these characters do not apply to Tetracoccus . 
