410 
Leidjaiia tiiiei u. S2). 
REFERENCES. 
Crawley, H. (1903 a). List of Polycystic! Gregarines of the United States. Proc. 
Amd. Nat. Sc. Philad. LV. 41-58. 3 PI. 
- (1903) b. The Polycystic! Gregarines of the United States (Second Contribution). 
Proc. Acad. Nat. Sc. Philad. lv. 632-644. 1 PI. 
- (1907). The Polycystic! Gregarines of the United States (Third Contribution). 
Proc. Acad. Nat. Sc. Philad. lix. 220-228. 1 PI. 
CuENOT, L. (1901). Recherehes sur revolution et la conjugaison des Gregarines. 
Arch, de Biol. xvii. 581-652. 1 PI. 
Minchin, E. a. (1903). The Sporozoa. A Treatise on Zoology edited by E. Ray 
Lankaster. 
Watson, M. E. (1916). Studies on Gregarines. Illin. Biol. Monographs, ii. 1-258. 
Pis. I-XV. 
EXPLANATION OF PLATE IX. 
c.i., epithelial cell of intestine of the host, c.w., cyst waU. d., dentomerit. ex.l., 
external transparent layer of cyst, ep., epimerit. p., protonierit. sp., spores, spd., 
sporoduct. 
Figs. 1, 2, 3, 4, 5 and 6. Different stages of trojDhozoite, attached to the epithelial cells 
of the host, or free, x 390. 
Fig. 7. A full grown sporont. x 270. 
Fig. 8. Sporont with protoplasm showing transverse folds; from a living specimen, x 390. 
Fig. 9. A young sjjoront curved, x 562. 
Fig. 10. Trophozoite with protoplasm showing transverse folds, x 390. 
Fig. 11. Young cyst from the midgut of the host, x 280. 
Fig. 12. 8iiores. 
Fig. 13. Cyst before dehiscence, x 390. 
Fig. 14. Cyst during the dehiscence, x 562. 
