542 
PROTOZOA. 
Actinosphceriiim eichhorni (Elirbg.); Schultze (11, i.). Only two layers 
can be distinguished, the cortical with fewer granula and larger alveoli, 
and the medullary with more numerous granula and smaller alveoli, but, 
in the peripheral portion, with 1-160 nucleolated nuclei ; the pseudo- 
podia are stiffened by an organic axial skeleton, the hyaline rays of which 
terminate [abruptly] in a cuneiform base against or in the surface of 
the central layer one or two pulsatile vacuoles in the cortical layer ; 
when preparing for propagation, early in winter, the pseudopodia are 
withdrawn, a gelatinous covering is secreted, and its contents divided 
into 10-30 germ-balls, each containing one nucleus, and, when mature, 
enclosed in a siliceous shell ; the young Actinosphonrium has a single peri- 
pheral layer of large alveoli and a single nucleus. Also described by 
Hertwig & Lesser (3), pp. 176-178, pi. v. fig. 1. 
Lithocolla glohosa, g. & sp. nn., Schultze (1. c. ii.), p. 389, pi. xxvi. 
figs. 6-10. Densely covered by small sand-grains, &c., held together by 
the sarcode, from which radiate delicate pseudopodia (Baltic, littoral). 
Choiulropus viridis [Zool. Roc. x. p. 530], Greeff (1), p. 27, pi. ii. fig. 18. 
Globular, filled with green, small, rod-like bodies, &c. ; pseudoi>odia 
radiating (Lahn-river). 
Asti'ococcus ru/us [Zool. Rec. x. p. 530], id. 1. c. pp. 27 & 28, pi. ii. fig. 19. 
Similar, but without green globules or rod- like bodies. 
Udiophrys variahilis [Zool. Roc. x.p. 530], id. 1. c. pp. 28 & 29, pi. ii. figs. 
20-23. Globular or discoid, with a thick, hyaline, homogeneous, cortical 
layer, with rod-like granula on the surface ; several nuclei and non-con- 
tractile vacuoles ; pseudopodia ordinarily not ramified. According to 
Hertwig & Lesser (3), identical with Heterophrys varians, Schultze (11, 
ii.), pp. 386-389, pi. xxvi. figs. 3-5; naked or surrounded by a hyaline, 
extremely delicate, structureless substauce ; three to six nuclei ; pulsatile 
vacuoles often in great number ; pseudopodia without axial skeleton ; 
sometimes withdrawing the pseudopodia and transformed into quiescent 
balls without pulsatile vacuoles, &c. {Nudearia, Cienk. ?). Cf. also 
Hertwig & Lesser (3), pp. 60 & 61, who deny the existence of the normal 
layer outside the body in those specimens which are surrounded, at some 
distance, by minute rod-like bodies. At all events, generically distinct 
from Heterophrys myriapoda, Archer ; Greeff (1), pp. 21-23, pi. i. figs.^ 8 
& 9 ; radial immersed siliceous spicula (?) in small numbers or wanting ; 
sarcode-ball filled with green globulus, surrounded by a narrow hyaline 
and a broader granular layer, from which radiate pseudopodia of two 
sizes ; also a variety with numerous, short, rod-like bodies in the outer 
layer in the place of granula. 
Heterophrys spinifera and marina (from sea-water), Hertwig & Lesser 
(3), pp. 211-217, pis. iv. fig. 4, v. fig. 3. Skeleton formed of an appa- 
rently granular, spongy, siliceous (?) substance, with numerous short 
or long, delicate, radiating spines; pseudopodia long, granuligerous, 
neither ramified nor anastomosing ; sarcodal body differentiated into 
eudosarc (with one nucleus) and ectosarc (with contractile vacuoles). 
Rhaphidiophrys pallida, sp. n., Schultze (11, ii.) pp. 377-385, pi. xxvi. 
figs. 1 & 2. No chlorophyll-balls ; the peripheral siliceous spicules are 
held together only by the pseudopodia and by slight exjiansions of their 
