CHROOCOCCACE, 215 
Merismopedia ventriculi. Robin Veg. Par.t. 1, f.8 
Thallus mucous-membranaceous, firm, whitish or yellowish ; 
families composed of numerous cells (8-4096); cell-contents 
pale bluish. 
Size. Cells 008 mm. diam. ; families -03-:05 x -016--02 mm. 
Rabh. Alg. Eur. ii., 58. Kuchenm. Par. p. 18, t. 1. 
Merisnopedia Goodsir’, Husem. de Anim. p. 18. 
Surcina ventriculi, Goodsir in Edin. Med. and Surg. Journ. 
1842, p. 430, t. 57. Welcker in Quart. Journ. Micr. Sci. viii., 
p. 168. 
In the human stomach, &c. 
Doubtfully included here. Recently authors have classed it with 
Schizomycetes in preference to Algz. 
Plate LXXXVII. fig. 6. a, cells magnified 400, }, cells very 
highly magnified. After Robin. 
Merismopedia renis. (Hepw.) Rabh. Alg. Fur. 11., 59. 
Families composed of from 8 to 64 cells. 
Sizz. No dimensions given, 
Sarcina renis, Hepworth in Micr. Journ. v. 1857, p. 1, 
with woodcut. 
In the human kidneys, 
This very obscure -organism, like the last, is included here with con- 
siderable doubt. It may be said that nothing more is known of it than 
the meagre diagnosis above given. Sarcina osstum, Stephens, Ann. Nat. 
Hist. ser. 2, vol. xx., p. 514, is equally uncertain. 
Plate LXX XVII. fig.7. Cells very considerably but indefinitely mag- 
nified. After Hepworth. 
Genus 89. TETRAPEDIA. Reinsch. (1867.) 
Cells compressed, quadrangular or triangular, equilateral, 
becoming subdivided into quadrate or cuneate segments, or 
rounded lobes, either by deep vertical or oblique incisions, or 
by wide angular or rounded sinuses. 
«Amongst unicellular Alge falling under the class Chlorophyllacee, 
forms with specially figured cells—that is, otherwise than globular, ellip- 
soidal, or cylindrical, with more or less abruptly or broadly rounded ends 
—are, as is well known, numerous; but amongst such plants belonging 
to the class Phycochromacee, so frequently found in the same situations 
associated with the foregoing, so far as ] am aware, not until recently has 
attention been drawn to any examples ofa specially figured outline. 
‘It does not appear, until the genus Tetrapedia was founded by Professor 
Reinsch for two new and singular exceedingly minute chroococcaceous 
forms, that examples of specially figured forms were known in this family 
of Alge. 
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