1894. ] A Blue-Green Motile Cell. IOI 
As the presence of pigment spots, character of the chro- | 
matophores and general simplicity of the cell distinguish the 
form here described from the genus Cryptomonas as understood 
by Dangeard, Stein, Cienkowsky, and primarily by Ehren- 
berg, it has seemed best to adopt the name Cryptoglena with 
the character of the genus as defined by Ehrenberg, and as 
no described species appears to be like the present form, it 
seems desirable to publish its description as: 
Cryptoglena Americana, sp. nov.—Motile cells broadly 
elliptical, 8-1oy long, 5-6 wide: cell contents blue-green 
with 6-10 disc-shaped chromatophores arranged around the 
periphery: one or two bright red pigment spots placed on 
the periphery near the middle of the cell: one end hyaline, 
slightly truncate, with a depression from which arise a pair 
of an of unequal length, the longer about as long as the cell 
is wide, : 
Non-motile cells slightly shorter and somewhat broader 
than motile cells (7-9 long x 6-7 wide), arranged in groups 
of twos and fours in a closely packed Polycystis-like colony: 
almost uniformly colored, blue-green, with 6—10 disc-shaped’ 
chromatophores and one or two brownish red pigment spots 
near the middle of the cell at the periphery: nucleus near the 
middle of the cell. ; 
Habitat: salt marshes of the Charles river, Cambridge, 
Mass., on stems of grass and larger alge. Autumn. ** 
The agreement in measurements between the non-motile 
ri of Cryptoglena Americana and the cells of the American 
form of P olycystis pallida, described by Dr. Farlow,?® is very 
teresting and suggests the possibility that this Polycystis 
pallida is really the non-motile condition of this species of 
*s a nle Ihave had the opportunity of comparing her- 
wee Specimens of the American Polycystis pallida with 
id “pean specimens of the same species and they seem to be 
entical. 
We head Pe speeimens of Polycystis pallida give very little 
pe of a cell structure as differentiated as Cryptoglena 
rar ee but specimens of Cryptoglena Americana after 
the e. tied on mica for a month gave very little indication of 
romatophores and no indication of the pigment spots. 
“The Motile 
frequent y 
Condition appears to be common all through the winter. It has 
15 itten. 
“0 met with since the above was wr 
© Marine alge of New England 28, 1879. 
