 
      
      "Rana esculenta. The brain. A, from above; B, from below. ch. opt, optic chiasma; HH, cerebellum; Hyp,…
 
      
      "Chondrocranium of Frog (Rana esculenta). y, girdle-bone or os en ceinture; EO, exoccipital; PrO, proötic;…
 
      
      "Rana esculenta. Urinogenital organs of the female. N, kidneys; Od, oviduct; Ot, its coelomic aperture;…
 
      
      "Rana esculenta. Urinogenital organs of the male. Ao, dorsal aorta; Cl, cloaca; Cv, post-caval vein;…
 
      
      "Rana esculenta. Pelvic girdle from the right side. G, acetabulum; Il, P, ilium; Is, ischium; Kn, pubis."…
 
      
      "Rana esculenta. The shoulder girdle from the ventral aspect. Co, coracoid; Co', epicoracoid; Cl, clavicle;…
 
      
      "Dissection of tadpole. DL., Lower lip; H., ventricle of heart; DE., oesophagus; NA., head kidney; A.,…