JOUHNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE IV, 



Illustrating Mr. A. G. Bourne's paper " On Certain Abnor- 

 malities in the Common Frog (Rana temporaria)." 



Fig. 1 . — Urogenital organs, ventral view. herm. Ovotestis. ie. Testicular 

 portion. ov. Ovarian portion. K. Kidney. ur. Ureter. cl. Cloaca. 

 C. Ad. Corpus adiposum. 



Fig. 2. — The ovotestis, dorsal view. te. Testicular portion, ov. Ovarian 

 portion, m.or. Mesorchium. m.o. Mesovarium. 



Fig. 3. — Ovotestis from £,ana temporaria, section passing through the 

 junction of testicular and ovarian portions, ov. Ova. sp. Seminal crypts. 



Fig. 4. — Section passing through the junction of the testis, with the rudi- 

 mentary ovary in Bufo cinereus. oy . Cells resembling ova. sp. Seminal 

 crypts. 



Fig. 5. — Dorsal view of normal vertebral column of Rana (after Ecker). 

 Fig. 6. — Dorsal view of abnormal column, Case A. 

 Fig. 7. — Ventral view of atlas vertebra. Case A. 

 Fig. 8. — Ventral view of 3rd vertebra. Case A. 

 Fig. 9. — Dorsal view of abnormal column. Case B. 

 Fig. 10. — Dorsal view of 10th vertebra, Case B. 

 Fig. 11. — Vertical elevation of same vertebra, from behind. 

 Fig. 12. — Urostyle of same frog, showing the concave facet as in the 

 normal urostyle. 



References in Figs. 5 — 12 : — at. Atlas vertebra, ax. Axis vertebra, ur. 

 Urostyle. 1 — 10. Numbers of the vertebrae. 



