of the second cavity of the stomach of Platanista gangetica from the
area of the so-called “ cup-shaped bodies,” one of these latter being
shown, sunk within the tissues, among which are somewhat wavy glands.
Enlarged about 20 diameters.
Eig. 2. The same membrane of second stomach of Platanista shown on its free
mucous surface, and exhibiting the “ cup-shaped bodies ” in transverse
section. Magnified about 20 diameters*
„ 3. A transverse section of portion of the gland which lies outside the stomach
of O. brevirostris, viz., between its second and third cavities {see
Pl. XXVII, figs. 5, 9, and fig. 7) x 8 diameters : v., part of one of the
large blood-channels cut in its longitudinal direction and v* a smaller
tributary blood-vessel ; g. g., the proper gland substance.
„ 4. A section of one of the glands from the outside and root of the lung of P.
gangetiea. I t shows both large and some of the smaller blood-channels
and a mass of the gland substance proper in which here and there are
open spaces x 10 diameters : at c. a few of the lymph corpuscular bodies
are shown much more highly magnified.
„ 5. A portion of the so-called “ pulmonary gland ” found in the pericardial
region of Orcella, as seen in section. Various large irregular-shaped
vascular areas (v.) are obvious, the glandular substance surrounding
these and marginally at r. ; some of the fibres of the retiform tissue are
noticeable. Enlarged x 10 diameters.
„ 6. A vertical section exhibiting the glandular structures in the walls of the
mucous membrane of the larynx of O. brevirostris : g., superficial glandular
body ; g.,* glands situated in the sacculations of the larynx.
„ 7. A perpendicular section through the eustachian or guttural pouch of
Plata/nista. This exhibits the superficial papillæ-like folds of the
mucous membrane with their imbedded glands, the crypts, submucous
tissue, and muscular fibres in cross section. Enlarged about 10
diameters.
„ 8. A much more highly magnified view of a small portion of the preceding
preparation: g., glandular follicles ; c., connective tissue with corpuscula;
m., muscular fibres in cross section.
„ 9. A superficial view of a small piece of the inner free mucous membrane of
the gravid uterus of Orcella, This shows a bare spot, passing through
which is a dichotomously branched utricular gland u. g., capillary
vessels being obliquely directed beneath its branches. Magnified about
12 diameters.
„ 10. A transverse section of a segment of the ovary of the foetal Orcella brevirostris,
magnified about 6 diameters : o., ovigerms forming a peripheral
cortical zone; g. v., Graafian vesicle ; sp„ space where Graafian follicle
has fallen out ; s., stroma of medullary part.
„ 11. Segment of the ovary from the gravid female Orcella brevirostris. This
( 17 )
transverse section cuts through a corpus luteum {c.l.): o., ovum: f ,
empty follicle from which the ovum has escaped (possibly in making
the section); stroma of the ovary; p.b., pale band described in text.
Magnified 12 diameters; a., a highly magnified representation of the cells
composing the medullary stroma.
Eig; 12. A vertical section of a small piece of the chorion of Platamsta cutting
through {b.) a bare spot, on either side of which are villous processes
(v. p.), capillary vessels (v.) penetrating these. Magnified 12 diameters.
„ 13. Superficial view of a bare spot of the chorion of P. ga/ngetica, with the
blood-vessels injected. Enlarged about 10 times natural size.
„ 14. A small portion of the chorion from the non-gravid horn of the uterus of
Orcella brevirostris. Shown in vertical section, and enlarged 6 times
natural Size.
„ 15. A little piece of the amnion of Platamsta exhibiting the so-called grey
bodies {g. b.) in situ, in the otherwise granular membrane: x 25 diameters
: a., three of the club-shaped, crystalline constituents composing the
grey bodies, and highly magnified.
16. A section of the gland-like body (or hippomanes) from the allantois of the
Gangetic Dolphin {Platanista). The various-shaped crystalline particles
are distributed throughout the meshes of the corpuscular network.
Highly magnified.
PLATE XXXVIII.
Chiefly devoted to a microscopical exposition of the female genital passages
and cavities and the utricular glands of Plata/nista and Orcella.
Eig. 1. A section through the wall of the uterus of the foetal Platanista. Enlarged
about 6 times natural size.
2. A segment of the previous section, highly magnified : g., glandular and
epithelial layer, u. being the utricular glands; c., connective tissue or
submucous layer ; m., muscular coat ; fv., jibrovascular layer ; fs., fibroserous
investment.
3. A segmental section of the wall of the common cavity of the uterus of
Orcella brevirostris : m.f., mucous folds and free villous surface ; u. g.,
utricular glands ; v., vascular area in the connective tissue. Enlarged
8 diameters.
4. A portion of a vertical section of the corun of the uterus of the virgin Platanista.
Enlarged about 18 diameters. This shows a plentiful development
of utricular glands : g., glandular and epithelial layer ; c., connective
tissue and capillaries ; m.f.s., muscular, fibrovascular, and serous
layers.
5. A section through the wall of the virgin uterus of Orcella, and wherein no
utricular glands are visible. Enlarged about 8 times natural size.