PSEUDOCHLAMYS. 129 
Genus 16. PSEUDOCHLAMYS Claparéde & Lach- 
mann, 1859. 
Pseudochlamys Ciararipn & Lacumann Etudes Inf. et 
Rhiz. 2 (1859), p. 448. 
Amphizonella Grurry in Arch. f. mikr. Anat. II (1866), 
p. 323. 
Test discoid, flexible when young, protecting the 
plasma-body, which contains a central nucleus and 
several contractile vesicles. 
This genus was established by Claparéde and Lach- 
mann (loc. cit.) to include a minute and highly-curious 
Arcella-like organism. Ordinarily the test is smooth, 
and, in the young state, quite transparent, but it 
becomes brown with age, most deeply coloured in the 
centre, and shading off towards the margin, sometimes 
appearing ‘‘faceted or punctate” according to these 
authors. Hertwig and Lesser (‘ Arch. fiir mikr. Anat.,’ 
1874) represent the concavity of the test, which in 
general shape resembles a watch-glass, as being closed, 
all but a central opening, by a delicate and hyaline 
continuation of the rim, completing the external 
resemblance to Avcella. Penard figures the same 
(‘Faune Rhiz. du Bassin du Léman,’ p. 181). The 
peripheral membrane is so exceedingly attenuated 
that the structure referred to is very difficult to make 
out. In the scores of empty tests we have examined, 
only in one instance did we find the faintest semblance 
of a central opening. 
1. Pseudochlamys patella Claparéde & Lachmann. 
(Plate XVI, figs. 1-9.) 
Pseudochlamys patella CLaparnpe & Lacumann Etudes Inf. 
et Rhiz. 2 (1859), p. 443, t. xxi, f. 5; CarpEnrer 
Foram. (1862, Ray Soc.), p. 25; Herrwic & Lesser in 
Arch. f. mikr. Anat. X (1874), Suppl. p. 100, t. iii, f. 1; 
F. E. Scuurze in Arch. f. mikr. Anat. XI (1875), p. 332, 
t. xvili, ff. 7-14; Atrmaw in Journ. Linn. Soc., Zool. XIII 
(1877), p. 393, f. 3; ArcHuR in Q. J. Micr. Sci. XVII, 
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