300 CLAVPOEE: 
EXPLANATION OF PLATE XXvV. 
Fic. 58. Longisection through abdomen of last stage of embryo. ev., ento- 
derm. Other letters as before. Borax carmine and Orange G. Obj. 74, oc. 4- 
tube length 153. 
Fics. 59, 60, 62. Cross-sections of ovaries of just-hatched Anurida. y., em- 
bryonic yolk; rest of letters as before. Borax carmine and Orange G. Obj. 
qs Oc. 4, tube length 15}. 
Fic. 61. Cross-section of small animal taken early in the summer. Erlich’s 
haematoxylin. Obj. 75, oc. 4, tube length 15}. 
Fic. 63. Blood corpuscles from just-hatched animal containing yolk. Borax 
carmine. Obj. 74, oc. 6, tube length 153. 
Fic. 64. Slightly oblique longisection of just-hatched male. 7. longitudinal 
muscles; fg., fat globules; zzz., intestine; 7.c., opening of reproductive organs; 
n.c., nerve cord; other letters as before. Enrlich’s haematoxylin. Obj. 8, oc. 4, 
tube length 152. 
Fic. 65. Longisection through mid-gut of just-hatched male. ez., entoderm ; 
y. yolk; cg. cavity of gut; s., sperm cells; g.e., germinal epithelium. Borax 
carmine and Orange G. Reichert, obj. 75, oc. I. 
Fic. 66. Frontal view of Petromyzon from a drawing by Dr. W. M. Wheeler. 
This shows the association of yolk with germinal cells. 
