MARINE PROTOZOA FROM WOODS HOLE. 
453 
6. Right margin of peristome straight as far as the anterior end; 5 rows ventral cirri; 5 anal cirri Genus Oxytriclia 
Right margin of peristome curved I 
7. Five rows or less of ventral cirri 8 
More than 5 rows of ventral cirri Genus Urostyla 
8. Membranelles normal; 5 to 10 anal cirri; no caudal cirri Genus *Amphisia, p.453 
Membranelles normal; 5 to 10 anal cirri; 3 caudal cirri Genus Stylonychia 
Membranelles very large and powerful; adoral zone not continued to mouth; 5 anal cirri Genus Actinotricha 
Genus EPICLINTES Stein ’62. 
(Stein ’62, ’64, ’67; Mereschowsky ’79; Gruber ’87; Biitschli ’88.) 
Very active, contractile, colorless forms of rather small size. In the fully expanded condition the 
hody is oval and long, with its greatest width in the center or at the front half of the body. The pos- 
terior end is always drawn out into a relatively long 
tail, which is extremely elastic. The peristome is 
short and stretches around the front end of the ani- ' 'SN^ 
mal. In the frontal region are from one to three 
rows of cirri. The ventral surface is covered with 
longitudinal rows of cilia, the number of rows being 
in dispute (6 to 7 according to Stein ; 9 according to 
Mereschowsky and Rees). Some of these cilia pro- 
ject from the lateral edges and from the posterior 
end, where they are slightly elongated. The anus is 
dorsal and placed at the beginning of the posterior 
process. Macronucleus probably double. Movement 
is rapid and restless, the tail process contracting to 
jerk the body backward. Salt water. 
Epiclintes radiosa Quenn. Fig. 50. 
Synonym: Metro, radiosa Quenn. 
The body is elongate, slightly narrowed anteri- 
orly, and drawn out posteriorly into a long, retractile, 
tail-like portion. Five large cirri extend outward 
from the anterior extremity. The caudal portion 
may be extended to a distance equal to twice the 
length of the body or contracted to half the length. 
The peculiar nervousness of this form made it ex- 
tremely difficult to study, and the oral region was 
imperfectly made out. The anterior cirri appear to 
line the upper left border of the peristome, which is 
marked by a row of large cilia. The peristome begins 
upon the right side of the anterior end and passes 
backward and to the left, narrowing at this point. 
The mouth is very small and difficult to see. It is apt 
to stay in one locality under zooglcea, switching back 
and forth with great vivacity, or hanging on by the posterior cilia while the anterior end stretches 
out in the surrounding medium. Nucleus and contractile vacuole were not observed. Length 45//. 
Fig. 50. — Epiclintes radiosa- 
Genus AMPHISIA Sterki ’78. 
(Sterki ’78; Kent ’81; Biitschli ’88.) 
The body is plastic and soft, colorless or slightly tinged with yellow or red. In form it is oval or 
elongate, the posterior end is rounded and slightly reduced in diameter, but does not form a distinct 
tail. The anterior end is also rounded and similarly reduced in width. There are two rows o-f 
marginal cirri ( Randcirren ), which may be placed some distance front the edge, and two or three rows 
of ventral cirri between them. There are from 3 to 5 frontal cirri of larger size than those of the ventral 
rows, and from 5 to 10 anal cirri. (The genus Holosticha is similar in all respects save the presence 
of frontal cirri.) The macronucleus is double; the contractile vacuole is central and on the left 
