Notes on British Flagellates. I— IV. 35 t 
ovum given by Stein 1 in the absence of any collar at the anterior 
end, but since no cilium was present it is possible that the absence 
of the collar may have been due to contraction, subsequent to the 
casting off of the cilium. The process of the posterior end was 
also much shorter than in the form figured by Stein. 
The second species of Lepocinclis (Fig. 3, A, B), from pools in 
the salt-marshes near Stanford-le-Hope in Essex, appears to be new 
and may be called Lepocinclis saliua n. sp. This organism is oval, 
39-45/a long by 27-31/a broad, the two ends being generally equally 
rounded, although the anterior may be a little pointed and the 
posterior occasionally bears a slight knob-like protrusion; in end- 
view the cell appears quite circular (Fig. 3, E). The rigid periplast is 
provided with a steep and well-marked spiral striation, and is extremely 
resistant, persisting for many weeks after the rest of the organism 
has died away; it becomes yellow with Iodine. At the front end of 
this periplast is a more or less circular aperture (Fig. 3, A, B) which 
is continued over the surface of the organism as a narrow groove 
terminating blindly about one-third of the length of the cell from 
the front end (cf. Fig. 3, A). From the mouth of the aperture 
arises the long spirally coiled flagellum (Fig. 3, B) which is about 
twice the length of the body and during life is in constant snake¬ 
like movement. The actual progress of this form is relatively slow, 
with a slow rotation of its axis, but the flagellum continues to move 
vigorously even when the organism is at rest. A prominent oval 
eye-spot is situated a little to one side near the front end (Fig. 3, A). 
The large spherical nucleus, readily seen in the living individual, 
lies a little behind the middle of the cell (Fig. 3, B). Numerous 
discoid chloroplasts and ovoid paramylon-bodies are scattered 
throughout the cell. No reproductive stages were observed. This 
species apparently stands rather close to L. Butschlii Lemrn., which 
has the same spiral striation ; L. Butschlii , however, is not so broad 
and is gradually drawn out at the posterior end to a point. 
Brief Diagnoses of the New Forms Above Described. 
1. Isococcus nov. gen. Volvocacearum. 
Cellulae mobiliae, nudae, periplasmate spiraliter striato, tegmine 
sphaerico vel ovali paullo incrassato circumdato; cilia bina, plus 
quam duplo long, corpore cellulae, per foramina tegminis ampla 
bina, circularia vel paullo ovalia, collari exiguo munita emergentes; 
1 Cf. E. Lemmermann, “ Euglenineae,” in Pascher, “ Susswasserfiora 
Deutschlands, Osterreichs, und der Schweiz.” Heft 2, 1913, Fig. 216 (p. 136). 
