1886.] 



MICEOSCOPICAL JOURNAL. 



97 



membrane of the mother cell ; mem- 

 branes not confluent. Mucous en- 

 velopes clear or lamellose. 



93. Genus Aphauocapsa Niigeli. 



Cells spherical, with thick, conflu- 

 ent envelopes which form a structur- 

 less gelatin. 



[Compare Aphanothece^ genus 



94. Genus Gltxocapsa Nageli. 

 Cells spherical, sometimes before 



division elongated, with thick vesicu- 

 lar membranes, single or in families, 

 the membrane of the mother cell en- 

 closing the daughter cells. Cell con- 

 tents bluish-gi'een, or red. 



Resting cells of the form and size 

 of the vegetative cells, with thick, 

 rough epispore observed in some spe- 

 cies. 



[See Gloeocystis^ genus 8.] 



95. Genus Poly cyst is Klitzing. 

 Cells spherical, united in spherical 



families which remain united in 

 grape-like inasses. 



96. Genus Microcystis Kiitzing 

 (extended) . 



Cells spherical, very many united 

 in solid, spherical families, cells 

 closely aggregated, enclosed in a thin, 

 common envelope. 



97. Genus GomphospJuvria Kiitz- 



Cells united by gelatin in spherical, 

 solid families, the inner cells spher- 

 cal, the outer ones wedge-shaped with 

 the points directed toward the centre 

 of the sphere. 



b. Division at first in three 



DISTINCTIONS, LATER IN 

 TWO. 



98. Genus Clathrocystis Henfrey. 

 Cells spherical, arranged on the 



outer sui'face of hollow balls or sacs, 

 which are afterwards ruptured in 

 places and form latticed or irregularl}' 

 lobed gelatinous expansions. The 

 cells multiply by division in the gelat- 

 inous matrix, and the latter increases 

 in extent. 



99. Genvis CoelosphcEriu7n^'-k^<i\\. 

 Cells spherical, arranged in single 



layer at the periphery of a structur- 

 less, gelatinous sphere. Occasionally 



the cells appear to be associated in 

 families, but usually the membranes 

 are confluent, and the traces of divis- 

 ion entirely lost. 



c. Division only in two di- 



rections. 



100. Genus j\Ieris>nopcdia^\eyG^n. 



Cells spherical or oblong, connected 

 in a single layer in flat, rectangular 

 families of 4-8-16, etc., b}' their con- 

 fluent membranes, in which the cells 

 are arranged in straight, longitudinal 

 and cross lines. 



d. Division only in one di- 



rection. 



loi. Genus Synec/iococcnsl>i'6.ge\i. 



Cells elongate or cylindric, with 

 thin membranes, single or in series 

 of 2-4. 



102. Genus Glai/cocystis Itzig- 

 sohn. 



Cells oblong or elliptic, with thin, 

 not gelatinous membranes, in small 

 tamilies enclosed by the expanded and 

 diflluent membrane of the mother cell. 



103. Genus Aphanothece Nageli. 

 Cells elongate, with thick, confluent 



membranes, forming a structurless 

 gelatin. 



[Compare Aphauocapsa , genus 



93]- 



104. Genus GhvotJicce Nageli. 



Cells elongate or cylindric, with 

 thick, vesicular membranes, single or 

 in spherical or elongated microscopic 

 colonies enclosed in a single vesicle, 

 with smaller vesicles within sur- 

 rounding the individual cells. Vesi- 

 cles lamellose. 



[Compare G/awcapsa, genus 94, 

 from which this genus diflers mainly 

 in the mode of growth due to division 

 in only one direction]. 

 o 



Staining Tissues in Microscopy. — 

 X. 



BY PROF. HANS GIERKE. 



'yContinued from p. 5^-] 

 229. Gibbes. On the double and 

 treble staining of animal tis- 

 sues. Journ. Royal Micr. 

 Soc, iii, 390-393. 

 After staining with picrocarmine, 



