Fig. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic, 
Fie. 
Fic, 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
Fic. 
THE ENTEROPNEUSTA. 677 
17. Pt. flava, var. saxicola. Dorsal view, slightly enlarged. 
18. Balanoglossus parvulus. Anterior end from dorsal surface. x 6. 
19. Pt. flava, var. gracilis. Preserved specimen from Minikoi. x 3. 
20. Pt. flava, var. parva. Section through collar cord, The dorsal and ventral walls of the 
central lumen shew a tendency to stick together. x 85. 
21. Pt. flava, var. parva. Section similar to above but from another specimen. The central 
lumen shews a marked tendency to occlusion and the lateral gland cells (g/.) are strongly 
developed. x 85. 
22. Balanoglossus parvulus. Section through proboscis pore. x 45. 
23. Willeyia bisulcata. Section through collar cord. x 85. 
PLATE XXXIX. 
24. Balanoglossus parvulus. Section through collar. x 45. 
25. Pt. flava, var. laccadivensis. Section through proboscis. x 45. 
26. Pt. flava, var. parva. Section through anterior collar region. x 20. 
27. Pt. flava, var. maldivensis. Section through edge of left genital pleura, x 85. 
28. Pt. flava, var. saxicola. Unusual dorsal root formed by pigmented outgrowth from collar 
cord and glandular ingrowth from epidermis. These two portions fuse a few sections further 
back. x 85. 
29. Willeyia bisulcata. Section through proboscis towards its hinder end. The dorso-ventral 
muscles (mdv.) are seen converging to the minute vermiform process of the stomochord. x 45. 
30. Pt. flava, var. saxicola. Small portion of inner surface of genital pleura shewing ingrowth 
from epidermis forming gonad, x 110. 
31. Pt. flava, var. saxicola. Section through tip of a genital pleura shewing epidermal ingrowth 
forming gonad. x 180. 
32. Pt. viridis. Section through proboscis, x 20. 
PLATE XL. 
33. Pt. flava, var. parva. An immature gonad shewing ectodermal connection, and quantity 
of mucus inside. x 180. 
34. Spengelia maldivensis. Section through collar canal just anterior to its opening into the 
first gill pouch, Ventral to it is the blind diverticulum of the first gill pouch of which the 
internal opening is marked by an asterisk *. x 85. 
35. Pt. flava, var. parva. An immature gonad in which the ectodermal connection is occluded 
by a mucous plug. x 180. 
36. Pt. flava, var. laccadivensis. From young specimen (anterior hepatic region) shewing very 
young gonad connected with the ectoderm. x 410. 
G.I 87 
