LIFE-CYCLE OF " CYSTOBIA " IRREGULARIS (mINCH.). 95 



■36. SiEDLECKi, M. — "Ueber die gesclileclitliclie Veniielirung tier Mono- 

 cjstis ascidise," •Bull. Ac. Cracovie,' 1900, pp. 515-537, Pis. I 

 and II. 



37. "Etude cytologique de la Coccidie de la Seiche," 'Ann. Inst. 



Past.,' vol. xii, pp. 799-836, three plates, 1898. 



38. ''Etude cytologique de Adelea ovata, Sclin.," op. cit., 



vol. xiii, pp. 109-193, Pis. I— III, 1S99. 



39. Wilson, E. — "The Cell in development and inheritance," 'Columb. 



Univ. Biol. Ser.,' vol. iv, 1900. 



40. Woodcock, H. M. — "On Cystobia irregularis (Minch.) and allied, 



' neogamous ' Gregariues " (preliminary note), 'Arch. Zool, exp.,' 

 N. et. B. (4) vol. ii, pp. 125-128, 190i. 



DESCRIPTION OF PLATES 1—6, 



Illustrating Dr. H. M. Woodcock's paper on " The Life-Cycle 

 of 'Cystobia' irregularis (Mincli.), together with Observa- 

 tions on other 'Neogamous' Gregarines." 



All figures with a high magnification were drawn as the sections appeared 

 under either the Zeiss apochrom. I'-IO N.A. 3 mm. lens, or the similar 2 mm. 

 one, with different compensating eyepieces. All figures, excepting fig. 6, were 

 drawn with the aid of the camera lucida. 



Reference Letters. 



a. or am. Loose wandering cells, amoebocytes, etc. a. g. Albuminoid 

 grannies (lenticular grains), bl. or bl. v. Blood-vessel, c, c'. Layers of con- 

 nective tissue, c. a. Nuclei: of cellular aggregation, c. e. or c. ep. Coelomic 

 epithelium, c. n. Nuclei of same. c. w. Cyst wall. ci/pl. Cytoplasm. 

 e. Outer epithelial layer, e^ Inner invaginated one. ect. Ectocyst. en. 

 Endocyst (or endospore). ep. Attaching epithelium, ex. Exospore. /. Frag- 

 ments of karyosome. fi. Eluid contents of lumen. /. I. Fibrous layer of tissue. 

 G. Gregarine. g. Albuminoid grains or lumps, i. m. Common or investing 

 membrane, h. Karyosome. /. l^. Limits of cup-like investment, lum. (orl.). Lumen 

 or cavity, i.itf. Longitudinal muscle. Z.»i. Limiting membrane. »/. or m. Z. 

 Muscle layers, vies. Mesentery attaching gut. N. Nucleus (of parasite), u. «^ 

 Nuclei of epithelial layer, n. of c. w. Nuclei of cyst-wall (vascular epithelium). 

 p. Tip of protrusion, p.g. Paraglycogen grains, r. ,5/. Minute refractile granules. 

 ret. Reticulum, s. Septum, s. r. Sporal residuum, sp. Spores, sp. c. 

 Spongy cells (loose tissue), sp. n. Sporoblast nuclei, st. or A. st. Stalk of 



