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of tlie second cavity of tlie stomach of Flatanista 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. 

 Kg. 2. The same membrane of second stomach of Flatanista 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. brevirost7'is, 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 ^.* 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. 

 gangetica. It 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 <?. 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 glan- 

 dular body ; g.,^ glands situated in the sacculations of the larynx. 



„ 7. A perpendicular section through the eustachian or guttural pouch of 

 Flatanista. This exhibits the superficial papillse-like folds of the 

 mucous membrane with their imbedded glands, the crypts, sub- 

 mucous 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 hrem^ 

 rostris, magnified about 6 diameters : o„ ovigerms forming a peripheral 

 cortical zone; g.v., Graafian vesicle ; ^i?., space where Graafian follicle 

 has fallen out ; s., stroma of medullary part. 



„ 11. Segment of the ovary from the gravid female Orcella brevirostris. This 



