PALMELLACEJE. 17 



" This species, nt all events, would appear to be distinct, the cells 

 being two to three times smaller than those of T. lubrica and T. gcla- 

 t insa . ' ' H assail. 



This is a doubtful species, which no one bat Hassall appears to have 

 seen. 



Plate VI. Jig. 4. Fragment magnified, after Hassall. 



GENUS 11. BOTRYOCOCCUS. Kutz. (1819.) 

 Thallns botryoid (or like a hunch of grapes), irregularly 

 lobed, mucous, involved in a tliin parent ineinltrane (?). Cells 

 ovoid or elliptic, unite.] in families, which are densely packed 

 within a thin diffluent tegument. 



Represented in Europe by a single species. 



Botryococcus Braunii. K>i(z.sp.'2. 



Small, free swimming, green, at length becoming pallid or 

 reddish-brown. 



SI/K. C.-lls -01--0125 mm. (/?/,//.). 



K'ahh. Alg. iii. 43. Free, in Abb. Senk. t. ii. f. 27-^. 

 Archer Micr. .Jotmi., 1*7' >, p. 83. Kirch. Alg. fcfchl. p. 111. 



In moor pools. 



Specimens were found by Dr. M<>ore floating on the surface of Lnuirli 

 111. -iv in long slieets of some yards in length. .Mr. Areher remarked 

 ni><>n these " that this was not an uncommon alira in moor pools, some- 

 times coaling Huluner:_ r i d 9, and the like, with a '_'re\ ish green 



stratum, sometimes, however, unspended in the water in streaks, and 



often i.-olated. It pa-.-i-s through a red condition. More than onee, 

 \\hena single u'l-oiip of family of this alira, from gat heriirj-s kept f.-r 

 some time in the lioii-e, had tui'iieil up tinder a low power of tin; 

 microscope, he had been t< \:< lit deceived by the way in which it 



resembles some nuliolarian rhi/opod, strange as it may seem. The 

 mucous matrix containing the families..!' e.'lls seems not unfri'qiienily 

 to give otT rathei long, lilit'orm jirolonira: ions, \\hicli standout more or 

 less radiantly, looking nt unlike p.-eiulopodia and these are Undoubted 

 rhizopoda containing chlorophyll. It mi'-clit, indeed, l>e a t,'ood examplo 

 of two objects with no atlimty in any respect to each other, still supt r- 

 ficially simulating one another. 1 ' Micro. Journ., 1870, p. 88. 



Plate I'll. /?//. ~. a, family group ; !>, sin<_rlo family ; c, undergoing 

 segQieutatiou ; d, free mature cells. All magnified 4uo diameters. 



GENTS li>. APIOCYSTIS. A7///. (1849.) 



Thallus small, vesicular, fixed by a stem-like base. Cells 

 globose, scattered, or sometimes 8 disposed in a circle ; contents 

 homogenous, or delicately granulose, with a distinct colourless 

 vacuole ; tegument thick, dissolving into a homogenous gela- 

 tine, cells dividing alternately in all directions. Propagation by 

 mobile gonidia, which are globose, and furnished with a pair of 

 vibratile cilia. 



This genus consists of a single species, unless the variety linearis of 

 Niigeli is entitled to rank as specifically distinct. 



D 



