MARINE PROTOZOA FROM WOODS HOLE 
429 
Exuvieella marina Cienkowsky. Fig. 19. 
A smaller form than the preceding, more elliptical in outline, with a thinner shell and with large 
granules throughout the endoplasm. The nucleus is spherical and subcentral in position and possesses 
a distinct central granule. This may be a small variety of E. lima. 
Genus GYMNODINIUM Stein ’ 78 . 
(Bergh ’81; Kent ’81; Pouchet ’83, '85; Entz ’84; Schtitt ’95.) 
The general structure of thes& forms is similar to that 
of Glenodinium; the most striking and positive difference 
is the absence of a shell. The animals are, as a rule> 
spherical, yet they may be pointed at the two ends or at 
one of them. They are also frequently flattened dorso- 
ventrally. The transverse furrow may be either circular 
and straight around the body or may describe a spiral 
course, passing even twice around the body. The flagella 
arise near cross-furrow or, in some cases, in longitudinal 
furrow. Chromatophores may or may not be present 
and food-taking is holozoic, in many cases at least. In 
some cases ectoplasm and endoplasm can be distin- 
guished. Fresh and salt water. 
Gymnodinium gracile Bergh ’82, var. sphaerica, n. 
The body is divided by the transverse furrow into a 
shorter anterior and a longer posterior part. The longi- 
tudinal furrow is broader at the posterior extremity than 
at the cross-furrow. The structural feature upon which this new variety is made is the unvarying 
plumpness of the body, making it almost spherical, except for a slight flattening dorso-ventrally. The 
nucleus is large and ellipsoidal, with characteristic longitudinal markings of chromatin. The endo- 
plasm is evenly granular, with a number of large ingested food bodies. The color is brown, not rose-red 
as in Bergh’s species, nor is the Woods Hole form as large as the latter. 
Length of body 68// ; width 55//. Common. 
Fig. 20 . — Gymnodinium gracile, var. sphserica. 
Genus GLENODINIUM (Ehr.), Stein ’83. 
(Bergli ’82; Biitschli ’86; Pouchet '85; Daday’86.) 
Small globular forms with two distinct furrows, one transverse around the body, the other longi- 
tudinal upon the face only. The shell is soft and structureless with a distinct aperture near the meeting- 
point of the two furrows. The endoplasm usually, but not always, contains a bright red “eye-spot.” 
Fresh and salt water. 
