38 COCCOPHYCES. 
Hydrodictyon utriculatum. Roth. Rabh. Alg. 66. 
Size of the families (net) variable; also of the cells (forming 
the meshes) and the gonidia, according to circumstances. 
Eng. Flora v., p. 359. Harv. Man p. 140. Eng. Bot. (Ed. 
2) t. 2504. Hook. Scot ii. 80. Gray. Arrang.i., p. 300. Hass. 
Alg. 225, t. 58. . 
Conferva reticulata, Dillw. Conf. t. 97. Eng. Bot. (Ed. 1) 
t. 1687. Huds. Ang. ii. 596. Relhan Cant. 444. Hull Br. 
Fl. 331. Abbot Bedf. 275. With. iv. 132. Ray Syn. p. 59. 
Dillen. Muse. 20, t. 4, f. 14. 
In clear water. 
For the development of this species see remarks under the genus, and 
also an elaborate account in Braun on Rejuvenescence, pp. 137, 171, 190, 
197, 222, and 261. Observations by Cohn “ Der Mikroskopischen Algen 
und Pilze,” p. 109, and Pringsheim “ Danerschwirmer des Wasser- 
netzes” (Berlin, 1861). 
Plate XIV. fig. 1. a, “Water net,” natural size; 5, one of the 
“‘meshes"’ magnified; ¢, cell with microgonidia X 300, after Cohn; d, 
portion of cell with angular macrogonidia X 300, after Cohn; e, free 
macrogonidia; f, active macrogonidia x 600. 
Sub-Family 6. Opstocytinz. 
Cells cylindrical, unequipolar, at first short, then elongated, 
either variously curved and contorted, sometimes circinate, one 
or other pole attenuated into a thin, short stem, free swimming ; 
either straight or more or less curved, collected in an umbel with 
a simple stem, or being repeated, forming a composite umbel. 
Cell-contents parietal, homogenous or granular, green, sometimes 
mixed with scattered reddish or brownish globules. Propaga- 
tion by gonidia.—Rabh. Alg. Eur. iii. 66. 
Genus 27. OPHIOCYTIUM. Wig. (1849.) 
Cells cylindrical, at first short, then elongated, variously 
curved, sometimes circinate, attenuated at one extremity into 
a short, thin stem; free swimming. Propagation by division 
of cell-contents and formation of gonidia. 
Rabenhorst unites the following genus with the present, giving to it 
the characters of the sub-family, but we have preferred to follow A. 
Braun and keep them distinct. 
Ophiocytium cochleare. Br. Alg. Unic. p. 54. 
Slender, pale green, often very long, filiform, variously curved, 
circinate, or more or less loosely spirally involved; stem short, 
spine-like, acute or truncate ; contents homogeneous. 
Size. Cells -005-0075 mm. diam.; length variable. 
Archer, Micr. Journ. 1866, p. 63. Rabh. Alg. iii. 67, 
