PROTOZOA. 
797 
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II 
Spocics 2. 
JB. alveolata (Diij.). 
Subspecies, E. enclielys^D. envhclys (Elir.= 
Trincma acinus (Duj.). 
E. maryaritacca— Cyphoderia maryaritacea 
(vSchlumb.^. 
var. ? E.haltica— Layynis haltica (Schiiltze). 
» I ^ 
Ij?? I— f 
GW 
Species 1. 
Cadium caudatum (Wall.), 
yar. C, marinum (Bailey). 
1^- 
Species 1. 
E, protciformis (Ehr.). 
Subspecies 1. 2). mitriforjnis (Wall.), 
var. a. D. acuminata (Ehr.). 
„ /3. D. sjnralis (Leclerc). 
„ V. n. pyriformis (Pertj). 
,, 0 . D. laycniformis (Wall.). 
Subspecies 2. X>. ylobutaris (Duj.). 
var. a. E. tuhercidata (Wall.). 
„ (3. E. acideata (Ehr.). 
„ y, E. corona (Wall.). 
Subspecies 3. E. arcclla (Ehr.). 
Subspecies 4. E. marsupiformis (Wall.), 
var. a. E. cassis (Wall.). 
Haeckel (/. c. p. 357 et seq.), in his memoir on the sarcode 
substance of the Rhizopods, arrives at the following conclusions : 
The sarcode appears as a tenacious jelly, like the white of an egg, of a 
homogeneous structure, not mixing with water, and which chemically, phy- 
sically, physiologically, and morphologically is as perfect in itself as the 
protoplasm of the animal or vegetable cell. In both divisions of the Rhizo- 
poduy the Radiolaria and the Acytliaria, this sarcode is essentially the same 
and exhibits the same fundamental vitalit}’^ ,• the apparent differences are of a 
very secondar}^ nature. The consistency of the sarcode varies in the different 
families ; but these differences, though in their extremes apparently great, 
are really unimportant. The extremest tenuity in the sarcode is met with 
among the Radiolaria in the Collidcc, JIcliosphccridcB, Splicer ozoidcc, and Col- 
lospliceridce ; the other extreme is met with among the Acanthometridee. 
When at rest the sarcode appears as a homogeneous albumen with a 
smooth surface ; but when in motion it projects in all directions a number of 
fine thread-like, often knottj’^, and anastomosing pseudopodia ; the number, 
form, size, the knotty appearance, and the anastomosing of these, the quick- 
ness, constancy, and regularity of their motion, are subject to continual, inex- 
haustible, and frequent changes. Each portion of the contractile sarcode- 
body can so alter its position that it can successively roach any other part of 
the body; hence the pseudopodia can separate or anastomose with each other 
as they will. In many Rhizopods round bodies nre found which do not 
differ chemically from ordinary cell-nuclei, supporting the assertion that 
the sarcode-body is nothing but a peculiarly loosely compacted cell. Having 
no regard to the nuclear bodies, the sarcode appears to be perfectly homo- 
geneous, without any trace of histological differentiation. The number of nuclei 
varies, according to Max Schultze, in one and the same individual at different 
times ; among the Rolythalamia the pseudopodia always have them. The 
shape of these nuclei varies ; the Acanthometridee and the MilioUdce are cha- 
