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Show l 6 6 DR. P. L. SCLA'lER ON THE [Mar. 4, PLATE XV. Fig. 5. The sac fully developed around the larva, which is cut through ventral sucker, s.v., rudimentary seminal vesicle at base of penis ; cm., circular musculature; l.m., longitudinal musculature; skr., ventral sucker. Other letters as in previous figures. X 130. Fig. 6. The Cercaria as it occurs in Mytilus. From a specimen stained in toto. CM., cuticle; m., mouth; a.s., anterior sucker; p.s., posterior sucker; ph., pharynx; s.gl., salivary glands; ce., oesophagus ; dig., digestive caeca; ex., excretory system; ex.p., pore of same; pe., penis; te., testes; v.d., vasa deferentia. X 130. Fig. 7. The same, in longitudinal section, pa., parenchyma; pa.n., nucleated subcutaneous layer of same; int.ep., intestinal epithelium, in surface view; g.p., genital pore; cm., circular musculature; l.m., longitudinal ditto. m.f., muscle-fibre in parenchyma; n.c, supra-cesophageal nerve-commissure Other letters as in fig. 6. X 130. PLATB XVI. Fig. 8. Dead Cercaria in Mytilus, with three centres of calcification. X 130. Fig. 9. Section of the muscular mantle-margin of Tapes, showing the Sporocysts with contained Cercariae. m., musculature of Tapes; sp., sporocyst; cer., Cercaria; ex., excretory tubes; dig., digestive caaca; pe., penis; s., ventral sucker of same. Fig. 10. Pressure preparation of the Cercaria from Sporocyst in Tapes. The specimen was examined alive, so sexual organs are not visible, e., eyes; t.p., tactile papilhe ; dig., digestive caeca; ex., excretory system. X 700. Fig. 11. The adult worm from (Edemia nigra L., River Villaine. s.v., seminal vesicle; ov., ovary; ut., uterus; g.p., genital pore. Other letters as in fig. 6. Stained in toto. PLATE XVII. Fig. 12. Mytilus edulis L., Piel, Lancashire. Photo of a thin slice or "Schliff" through centre of pearl, showing calcified Trematode as nucleus. X 25. Fig. 13. Ditto. Pearl formed in sac vacated by Trematode. A few granules of residual matter have calcified to form nucleus. X 25. Fig. 14. Ditto, showing several centres of calcification in the Trematode. X 25. Fig. 15. Ditto, double pearl, one of constituents being formed around Trematode, the other as in fig. 13. X 25. Fig. 16. Pearl from Margaritifera margaritifera Linn., N e w Guinea, showing imperfectly calcified Trematode, with radially arranged prisms. X 25. 2. List of the Parrots represented in the Society's Collection in January 1902, with Remarks on some of the Rarer Species. By P. L. SCLATER, D . S C , F.R.S., Secretary to the Society. [Received February 20, 1902.J (Plates XVIII. & XIX.1) The birds in the Society's Parrot-house having been lately re-arranged and the duplicates and " deposited " specimens having been moved to another place, I have thought it worth while to prepare a list of the species of Psittacidae now represented in the Collection, which may be useful in future years, and to add to it a few notes on some of the rarer forms. It may be observed that the 147 specimens of Parrots now For explanation of the Plates, see p. 171. |
