436 
R. T. Young 
F. The primarily imdifferentiated character of the cestode germ cell 
is indicated by the presence of flame cells in developing festes. 
References. 
1909. Beckwith, Cora Jipson. Preliminary report on the eaxly history of the egg and 
embryo of certain hydroids. Biol. Bull. XVI : 183 — 192. 
1904. Child, C. M. On amitosis in Moniezia. Anat. Anz. XXV : 545 — 558. 
1907. Studies on the relation between amitosis and mitosis. I. Development ot 
the ovaries and oogenesis in Moniezia. Biol. Bull. XII: 89 — 114. II. Develop- 
ment of the testes and spermatogenesis in Moniezia. Biol. Bull. XII : 175 — 224. 
III. Maturafion, fertilization, and cleavage in Moniezia. Biol. Bull. XIII: 
138 — 160. IV. Nuclear division in the somatic structures of the proglottids 
of Moniezia. Biol. Bull. XIII: 165 — 169. V. General discus^ion and conclu- 
sions concerning amitosis and mitosis in Moniezia. Biol. Bull. XIII: 169 — 179. 
1910. The occurrence of amitosis in Moniezia. Biol. Bull. XVIII: 109 — 119. 
1911. The method of cell division in Moniezia. Biol. Bull. XXI: 280 — 296. 
1917. CoNKLix, E. G. Mitosis and amitosis. Biol. Bull. XXXIII : 396 — 416. 
1909. Gouqh, L. H. The anatomy of Stilesia centripunctata. Vet. Bact. Lab., Trans- 
vaal Dept. Agric., Pretoria: 113 — 131. 
1909. Griggs, R. F. Some aspects of amitosis inSynchytrium. Bot. Gaz. XLVII : 127 — 138. 
1913. Harmax, Mary T. The method of cell division in the sex cells of Taenia teniae- 
formis. Journ. Morph. XXIV: 205 — ^243. 
1914. Hegxer, R. W. The germ cell cycle in animals. Macmillan. 
1907. Jaxicki, C. VOX. Über die Embryonalentwickhmg von Taenia serrata. Zeitschr. 
f.wiss. Zool. LXXXVII: 685—725. 
1911. Morse, M. Cestode cells in vitro. Science (N. S.) XXXIV : 770 — 772. 
1912. Pattersox, J. T. and Wiealax, H. L. The uterine spindle of the polyclad 
Planocera inquilina. Biol. Bull. XXIII: 271 — 292. 
1911. Rich.ards, A. The method of cell division in the development of the female sex 
Organs of Moniezia. Biol. Bull. XX: 123 — 178. 
1907. Stevexs, F. L. Some remarkable nuclear structures in Synchitrium. Ann. Myc., 
V: 480—484. 
1913. Youxg, R. T. The histogenesis of the reproductive organs of Taenia pisiformis. 
Zool. Jahrb. XXXV^ : 355—418. 
1919 a. The degeneration of yolk glands and cells in cestodes. Biol. Bull. XXXVI : 
309—311. 
1919 b. Association of somatic and germ cells in cestodes. Biol. Bull. XXXVI: 
312—314. 
Description of figures. 
Fig. 1 — 15 are foto-micrografs, all but 6 from sections, 6 from a smear. Figs. 5, 
6, 7, 9, 13 and 14 have been retouched; the rest are natural. The remaining figures are 
all from fresh preparations (25, 39 and 41 after staining with methyl green). All except 
20 and 22 are camera drawings; the latter are free-hand Sketches. Magnifications 
figs. 1-4, 6, 8, 10 X 700 ; 23, 24 and 25 x 500; 16—19, 21, 26—43 x 800 ; 5 and' 7, 
X 1250; 9, 11—13, 15 x 1000; 14 x 1700. 
