TFIK Dl'^n^'vLOPMENT OF PALUl'lNA VIVIPAI.'A. 148 



Fig. 12. — Transverse section 11ironf;li llie pn.sferior ret^inu of tlie visceriil 

 hump of an emhrvo bclongin;,' to Sfage 1). X 119. 



Fig. 13. — Transverse section tlirougli tlie posterior region of the visceral 

 hump of an embryo belonging to Stage E. x 119. 



Fig. 14. — Another section from the same series but passing tJirougli tlie 

 anterior region of the visceral hump, and showing ths great anterior or riyiit 

 exteiLsion of the manth; cavity. X 119. The section of ihe overhanging 

 foot,/:, is introduced iicre in its relative position, but is omitted in Fig. 13. 



Fig. 15.— Transverse section tiirough the posterior region of the visceral 

 hump of an embryo belonging to Stage F. x 119. 



Fig. 1G. — Transverse section tlirongh the posterior region of the visceral 

 hump and foot of an embryo belonging to Stage G. x 119. 



Fig, 17. — Transverse section through Ihe posterior region of the visceral 

 hump and foot of an embryo belonging to Stage H. x 119. 



Figs. 18 and 19. — Transverse section tiirough the " neck " region of t he 

 same stage, showing the twist of the visceral connectives, x 119. 



Fig. 20. — Transverse section through the visceral hump of the monstrosity 

 shown in Fig. 10, Plate 8, in tlie region of the kidneys, x 87. 



Fig. 21. — Another section of the same series passing through the opening 

 of the kidney duct into the mantle cavity, x 87. 



Fig. 22.— Transverse section through the stomach of tiie same embryo just 

 behind the opening into it of the oesophagus. X SO. 



Fig. B. — View of an embryo belonging to Stage B from the right side, x 

 70. 



Fig. C. — View of the right side of an embryo belonging to Stage C. x 

 70. 



Fig. Ci. — View of Ihe ventral surface of an embryo slightly older than the 

 last. X 70. 



Fig. D. — View of the left side of an embryo belonging to Stage D. x 70. 



Fig. E. — View of the left side of an embryo belonging to Stage E. x 70. 



Fig. El. — View of the right side of the same. X 70. 



Fig. E^. — Dorsal view of the same, x 70. 



Fig. Y. — View of the left side of an embryo belonging to Stage F. x 70. 



Fig. G. — View of the left side of an embryo belonging to Stage G. x 70. 



Fig. M II. — View of the left side of Monstrosity II. x 70. 



Fig. M III. — View of the left side of Monstrosity III. x 70. 



