418 Dr. W. C. M'Intosli 07i Pelonaia corrugata. 



diam., in fig*. 20. Its entire surface is studded with granular 

 glands. At r (fig. 2), entangled in the lining membrane^ was, 

 in each specimen, a small reddish grain, apparently of a fatty 

 nature. 



In the angle between the oral and anal openings is the opaque 

 pinkish nervc-ganghon, composed of minute, granular nerve- 

 cells. The branches have a granular appearance. 



EXPLANATION OF PLATE XII. 



Fig. 1. Pelonaia corrugata, of nearly the natural size. 



Fig. 2. View of the animal removed from its test, and enlarged under a 

 lens : a, oral aperture slit open ; b, pink anal cone ; c, oral ten- 

 tacles; c?, nerve-ganglion; e^ red pigment-specks ;/, muscular 

 sheath ; g, endostyle ; h, intestine bulged with muddy debris ; 

 i, branchial chamber ; m, oesophagus ; n, pyloric extremity of 

 stomach ; o, prominent and somewhat ])ediculated glandular 

 organs; p, stomach; r, reddish granule. 



Fig. 3. Tip of one of the oral tentacles, X 350 diameters. 



Fig. 4. Fibres from the muscular coat, X 350 diam. 



Fig. 5. Arrangement of the branchial apparatus : a, longitudinal bands ; 

 b, large circular bands ; c, slender circular bands ; e, branchial 

 spaces surrounded by rim ; /, portion of the endostyle, X 90 

 diam. 



Fig. 6. A few of the branchial spaces, with cilia at c, X 200 diam. The 

 slender circular band has been removed. 



Fig. 7' Smaller end of the larger example, as seen under a lens : a, oral 

 aperture ; b, anal aperture. 



Fig. 8. The larger specimen with its test laid open, and the parts removed 

 so as to show the rows of ova, &c. : the conical ending of the 

 muscular coat is seen at a ; b, bulla on the exterior of the latter, 

 indicating the region of the pediculated glandular organ ; c, de- 

 tached mass containing stomach &c. ; c?, d', rows of ova; e, test. 



Fig. 9. Endostyle of spirit preparation, magnified under a lens. 



Fig. 10. Cylindrical epithelium of the same, X 350 diam. 



Fig. 11. Cylindrical epithelium of oesophagus, X 350 diam. 



Fig. 12. A few loose hepatic cells, X 350 diam. 



Fig. 13. Portion of the yellowish longitudinal streaks (of liver-cells) from 

 stomach, X 350 diam. 



Fig. 14. Portions of hepatic ducts, X 350 diam. 



Fig. 15. Outline appearance of the glandular plaits in stomach, with 

 hepatic ducts, X .90 diam. 



Fig. 16. Fragment of the plaited structure under pressure, X 350 diam. 



Fig. 17. Fusiform cells from stomach, after the addition of sulphuric ether, 

 X 350 diam. 



Fig. 18. Large glands of intestine, X 350 diam. 



Fig. 19. Ova, X 200 diam. 



Fig, 20. Apex of one of the pediculated glandular organs in swollen part 

 of animal, X 350 diam. 



