316 E. C. POLLARD. 



EXPLANATION OF PLATE XXIX, 



Illustrating Miss E. C. Pollard's notice of " A New Sporozoon 

 in Amphioxus." 



Reference Letters. 



M. Nuclei of epithelial cells, altered in form by pressure of parasites, 

 M'. Typical nuclei of normal epithelial cells. N. Nuclei of parasites, n. 

 Nucleoli, p. The parasites, v. Vacuole-like appearance. 



Figs. 1—3.— Transverse sections through post-atrioporal region of the 

 intestine of Amphioxus, showing the parasites in groups. 

 Pig. 1. Zeiss, oc. 2, obj. A. 

 Fig. 2. Zeiss, oc. 4, obj. B. 

 Fig. 3. Zeiss, oc. 2, obj. B. 

 Fig. 4. — Group of the parasites within cells, giving cup-like appearance. 

 Zeiss, comp. oc. 4, obj. D. 



Fig. 5.— Small portion of intestinal epithelium, with cells containing 

 parasites. Zeiss, oc. 4, obj. D. 



Fig. 6.— Some of the parasites from Fig. 5 under a higher power. Zeiss, 

 comp. oc. 4, homog. imm. lens. 

 Figs. 7 and 8.— Groups of parasites in intestinal epithelium. 

 Fig. 7. Zeiss, oc. 4, homog. imm. lens. 

 Fig. 8. Zeiss, comp. oc. 4, homog. imm. lens. 

 Fig. 9. — cl—f, drawn from parasites found isolated from the cell, probably 

 due to the breakage of the cell by the razor; a — c, drawn from groups of 

 parasites seen in Fig. 7. Zeiss, oc. 8, homog. imm. lens. 



Fig. 10. — a — d. Ciliate parasites occurring in the atrium of Amphioxus. 

 Nu. Nucleus. 0. Mouth. Zeiss, obj. D, oc. 2. 



