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Show 1867.] MR. P. L. SCLATER ON LARUS FUSCESCENS. 315 DESCRIPTION OF PLATE XIX. Fig.l. Volvaria (Volvarina) pusilla, p. 303. 2. Macrochlamys minima, p. 303. 3. perlucida, p. 303. 4. Stylodonta (Erepta) rufocincta, p. 303. 5. (Erepta) nevilli, p. 304. 6. Pupa (Pagodella) ventricosa, p. 304. 7. Gibbus (Gibbulina) nevilli, p. 304. 8. (Gonidomus) newtoni, p. 305. 9. Ennea (Gulella) modesta, p. 305. 10. Cyclostomus (Tropidophora) mauritianus, p. 305. 11. scaber, 306. 12. Omphalotropis costellata, p. 306. 13. picturata, p. 306. 14. Cassidula parva, p. 306. Fig. 15. Plecotrema exigua, p. 307. 16, 16a. Nanina (f Rotula) conulus, p. 307. 17. Bulimulus (Ena) pusillus, p. 307. 18. Apicalia scitula, p. 308. 19. Colina pygmcea, p. 308. 20. Parmella planata, p. 308. 21. Bulimus (Mesembrinus) yealei, 22. Agadina gouldi, p. 309. 23. stimpsoni, p. 309. 24. Mangelia splendida, p. 309. 25. Putilla lucida, p. 312. 26. Fossarina picta, p. 312. 27. Amathina nobilis, p. 312. 28. Macrochisma sinensis, p. 312. 29,29a. Ccelopoma japonicum, p. 313. 30. Terebratula davidsoni, p. 314. March 28, 1867. George Busk, Esq., F.R.S., V.P., in the Chair. The Secretary called attention to two fine specimens of Boidce lately added to the Society's collection of living Reptiles, namely : - 1. A specimen of the Carpet-Snake of Australia (Morelia variegata, Gray), received from Queensland, purchased of a dealer. 2. A specimen of the Peruvian Boa (Boa eques, Eyd. et Soul.), from Guayaquil, presented to the Society by Prof. William Nation, of Lima, Peru, C.M.Z.S. Mr. Sclater also called attention to the specimen of Larus fuscescens, Licht. (Clupeilarus fuscescens, Bp. Consp. ii. p. 221), living in the Society's Gardens, having been purchased, when in immature plumage, in 1859, out of a vessel coming from Mogador, and pointed out how very distinct, when seen alive and in full plumage, this bird was from its near allies Larus fuscus and Larus argentatus. The three species might be diagnosed as follows:- L. argentatus. Major; pedibus pallide carneis: chlamyde cinerea. L. fuscescens. Medius : pedibus leete flavis : chlamyde nigricanti-cinerea. L. fuscus. Minor: pedibus pallide flavis : chlamyde nigricante. In his recently published • Muse'e des Pays-Bas' (Lari, p. 15), |