198 (. CLIFFORD DOBELL. 
13. NERESHEIMER, H.—‘‘ Die Fortpflanzung der Opalinen,” ‘Arch. Protis- 
tenk.,’ Suppl. i, 1907, p. 1. 
EXPLANATION OF PLATE 1, 
Illustrating Mr. C. Clifford Dobell’s paper on ‘“ Some Obser- 
vations on the Infusoria Parasitic in Cephalopoda.” 
Fig. 1.—Chromidina elegans, posterior end, showing various stages in 
the formation of buds. The chromatin is alike at all stages. (Hot picro- 
acetic, borax-carmine, differentiated acid-aleohol. Leitz #5 in. x 1.) 
Fig. 2.—C. elegans. Medium sized individual, entire. Note the nuclear 
network, chromatin granules, mouth, ete. (Sublimate-alcohol (hot), Dela- 
field’s heematox.  ); in. X 1.) 
Fie. 3.—C. elegans. Living animal: stained intravitam with neutral 
red. (Lin. x 5.) The food particles, vacuoles, and mouth are well seen. 
Fries. 4, 6, 6.—Three stages in the development. of the head of C. elegans. 
4. A small individual, without a mouth. 5. A larger animal, with a small 
mouth and feebly developed chromatin sling. 6. Very large individual, with 
well developed mouth and strongly developed sling. (1; in. x 1 (enlarged to 
scale). Hot sublimate alcohol, Delafield.) 
Fic. 7.—Posterior end of C. elegans, forming segments. The animal had 
died before fixation, thus giving rise to nucleus in the form of chromidia. 
(Sublimate alcohol, Delafield, 3, in. x 1.) 
Fic. 8.—Head of Chromidina coronata, large individual. The chro- 
matin sling is well seen (cf. fig. 6). m=position of mouth. ¢=an ingested 
cell from the kidneys. Various other cell remains are also to be seen. (Hot 
picro-acetic, borax-carmine. 5}; in. X 1, enlarged.) 
Fic. 9.—Opalinopsis sepiolx. Ordinary individual, showing contractile 
vaculole (c.v.), crystalline bodies, cuticular striation, ete. Living animal. 
(Ps in. X 1.) 
Fics. 10, 11.—O. sepiole, stained, showing nuclear network. Large 
individuals. (Sublimate alcohol, Delafield. 5 in. x 1.) 
Fies. 12, 13.—Two small O. sepiolew. (Sublimate alcohol, Delafield. 
1 in. x 1.) 
