EXPLANATION OF PLATE XVII. 



Fig. I. — Lateral view of an intra-uterine embryo of Scohodon 



ze;albeehini. 



2. — Diagram of a dissection of an embryo of 5. wal- 

 beehmi from the ventral surface to show the con- 

 nections of the blood-vessels of the placental cord. 

 X i|. 

 ,, 3. — Appendicula of type (i) with a part of the placental 

 cord of a specimen of Scoliodoii sp, from Ce5don. 



4. — Appendicula of type (ii) found on the placental cord 

 of S. walheehmi. X 25. 



5. — Appendicula of type (iii) found on the placental cord 

 of Scoliodon sp. from Madras. 



6. — Appendicula of type (iv) found on the placental cord 

 of Scoliodon sorrakowah. 



,, 7. — Transverse section of the placental cord oiS. wal- 

 heehmi as seen with the low power of the micro- 

 scope. 

 8. — A longitudinal section of an appendiculum of 5. wal- 

 heehmi, highly magnified. 



9. — A portion of the uterus of 5. sorrakoivah opened out 

 to show the disposition of the yolk-sac placenta. 



10. — The yolk-sac placenta and the placental cord of 

 5. sorrakowah separated out to show the protru- 

 berances on the yolk-sac. 



