634 
Fig. 2. 
of uriniferous tube ; a’, its cavity; a!/, glomerule ; b, blood- 
Laid June 12, opened Aug. 13, 1855. 
Windpipe, 500 diam. ; a, fibrous connective tissue ; 
Malpighian body from the kidney, 500 diam. ; a, wall 
vessel, artery ? 
Fig. 3. 
b, c, ring of cartilage; b, central cells; c, cells at the 
Hatched in Oct. 
Fig. 4. Portion of the lung, 250 diam.; a, outer wall; a’, a’, 
edge. Period of laying unknown. 
partitions; b, , bloodvessels; c’, interior wall of the par- 
titions; c!/, incipient partition in profile ; e, mucous mem- 
brane ; e/, e/, mucous membrane of an incipient partition ; 
J, lateral and downward projection of the larger parti- 
tions ; fig. 4a, a, surface of the lung; 4, bloodvessel; d, 
incomplete large partition; 250 diam. Laid June 18, 
opened Sept. 3, 1855. 
Fig. 5. End of the lung, showing the pigment cells follow- 
ing the courses of the bloodvessels, 25 diam. Period of 
laying unknown, opened Sept. 2, 1852. 
Fig. 6. Cartilage cells from the windpipe of fig. 5; 500 
diam. 
Fig. 7. A bronchiole of the lung surrounded by bloodves- 
sels, 500 diam. Period of laying unknown, opened Aug. 
28, 1852. 
Fig. 8. Pigment cells from the surface of the lung, 500 
diam.; the same as fig. 7. 
Fig. 9. 
brane ; fig. 9a, the same, seen through the round cells on 
A bronchiole of fig. 5; a, cells of the mucous mem- 
the surface of the lung; 500 diam. 
Fig. 10. Portion of fig. 5; a, bronchioles; }, musculo- 
fibrous partitions; c, bloodvessels; 300 diam. 
Fig. 11. Portion of fig. 5 still more magnified, 500 diam. ; 
a, cells of the mucous membrane; b, a partition nearest 
to the surface of the lung; }/, a partition lying deeper. 
Fig. 12. 
outer wall; 4, mucous membrane. Laid June 21, opened 
July 31, 1855. 
Fig. 13, and 13a. 
urinary bladder, 500 diam. 
Fig. 14, 
nary bladder (fig. 13 and 18a); fig. 14a, outermost cells 
End of the lung when very young, 250 diam.; a, 
Cells of the mucous membrane of the 
Cells of the interior muscular layers of the uri- 
of the muscular layers, 800 diam. 
Fig. 15. Inner ends of the cells (fig. 13, 13a) of the mucous 
membrane, 500 diam. 
Fig. 16. Mesh of muscular fibres of the urinary bladder, 40 
diam. 
Fig. 17. Contents of the bladder, 500 diam. 
Fig. 13 to 17 are drawn from the same specimen, just 
hatched, the period of laying of which was unknown. 
Fig. 18. Cells of the epidermis on the right, and the pig- 
Laid 
ment layer on the left; from beneath, 500 diam. 
June 21, opened Oct. 17, 1855. 




EXPLANATION OF THE PLATES. 
PLATE XXI. 
[Drawn from nature, by H. J. Clark.] 
Fig. 22, 28, 24, 25, 26, 30, from Chrysemys picta; fig. 27, and 
28, from Nanemys guttata; the others from Chelydra ser- 
pentina. 
Fig. 1. 
of the cesophagus, 500 diam. 
Fig. 2. 
esophagus, 500 diam. 
Fig. 3. Surface of the cells of the mucous membrane of the 
stomach, 800 diam. 
Fig. 4. Single cells of fig. 3, 800 diam. ; fig. 1 to 4, from the 
same animal; age not ascertained. 
Fig. 5. 
500 diam.; a, inner cells; b, columnar cells. 
Profile of the inner cells of the mucous membrane 
Columnar cells of the mucous membrane of the 
Section of the mucous membrane of the esophagus, 
Period of 
laying unknown, opened Aug. 30, 1852. 
Fig. 6. Inner surface of the esophagus, 500 diam.; the same 
as fig. 5. 
Fig. 7. Single cells of fig. 5, a, 500 diam. 
Fig. 8. Group of cells from fig. 6, in water, 500 diam. 
Fig. 9. Profile outline of fig. 8, to show the relations of the 
two strata of cells, 500 diam. 
Fig. 10. Epithelial cells at the base of the tongue, 500 
diam. Period of laying unknown. Just hatched. 
Fig. 11. Transverse section of a fold of the csophagus, 
500 diam.; a, inner cells; b, columnar cells; c, round 
cells ; d, inner muscular coat; the same as fig. 10. 
Fig. 12. 
800 diam. ; the same as fig. 10. 
Surface cells of esophagus, with vibratile cilia, 
Fig. 13. Very elongated cells from the muscular coat of the 
esophagus, 800 diam.; fig. 13a, a single cell of fig. 13, 
1100 diam.; the same as fig. 10. 
Fig. 14. Inner surface of the stomach, 300 diam.; a, en- 
trance to the glands ; 0, outlines of the glands; fig. 14a, 
14b, 
Period of laying unknown, 
open aperture of one of the glands, 500 diam.; fig. 
the same shut, 500 diam. 
opened Sept. 9, 1852. 
Fig. 14ce. Profile of the epithelial cells of the stomach, 500 
diam. ; fig. 14d, and 14e, surface view of fig. 14c, 500 
diam. ; fig. 14f, and 14, the same as fig. 14d, altered by 
water; 149, a, a single cell with its lateral mesoblast, 500 
diam. Period of laying unknown, opened Aug. 30, 1852. 
Fig. 15. Surface of the stomach, looking into the glands, 300 
diam. ; fig. 15a, mouth of a gland, 500 diam. ; a, epithe- 
lial cells of the stomach; 6, mouth; fig. 16, lower half 
of a gland, outside view; fig. 16a, transverse section of 
fig. 16 ; fig. 16b, longitudinal section of fig. 16 ; 500 diam. ; 
the same as fig. 1 to 5. 

