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Show 294 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [Apr. 20, tory organ (dart-sac) is a long cylindrical body, becomingJuner towards the posterior end; its retractor muscle has its attachment with that of the penis, close below the apex of the shell, m the body- Ca The spermatheca is of the same size as the latter, and in this specimen presents a swollen sac below, terminating in a short, thin, cylindrical point, which is buried and attached where the convolutions of the ovo-testis commence. The spermatophore is similar to that oi Austenia gigas, but rather shorter, the sac being 0*3 inch long. The cervicorn processes at the base are strong and numerous, much branched above (see Plate XXVII. fig. 8). The basal duct is 0*2 in length. Three of these were found in the spermatheca examined. List of species of Girasia. 1. hookeri, Gray (Plate XXVII. figs. 2, 3), = G. theobaldi, G.-A., Khasi. 2. crocea, G.-A., Khasi. 3. shillongensis, G.-A., Khasi. 4. , var. brunnea, G.-A. (Plate XXVII. fig. 1), Khasi.: 5. nagaensis, G.-A., Naga." 6. magnifica, Nev. & G-.A. (Plate XXIV. figs. 1, 2), Upper Burmah. 7. radha, G.-A.?, Assam. 8. burtii, G.-A.?, Assam. 9. peguensis, Th.?, Pegu. A U S T E N I A GIGAS. (Plate XXIV. fig. 8, shell.) Vitrina gigas, Benson, J. A. S. B. vol. v. (1836), p. 350. Helicarion gigas, Godwin-Austen, J. A. S. B., vol. xliv. (1875), plate iii. (animal). Vitrina gigas, Theobald & Hanley, Conch. Ind. pl. lxvi. figs. 2, 3. Helicarion (sec. Bi) gigas, Theobald, Cat. L. & F.W. Shells of B. India, p. 23, 1876. Helicarion gigas, var. minor, J. A. S. B. vol. xliv. 1875, pl. iii. (animal). Austenia gigas, G. Nevill, Hand List Indian Museum, 1878, p. 16 (no description). Shell ovate, broad, whorls about 11; apex depressed ; body-whorl large and flatly expanded, with a shining lustre; colour olivaceous, with sienna-brown, pale at apex, somewhat nacreous within. One specimen is all sienna-brown and milky-white within (Plate XXIV. fig. 9). Typical from Teria Ghat, Khasi Hills. Largest example: major diam. 1*7 inch, minor diam. 1*2 inch. Another: major diam. 1*53 ( = 3S*5 m.), minor diam. 0*95 ( = 24*5 m.). Var. minor1. Naga Hills. Shell: major diam. *84 inch (21*5 m.), minor diam. *55 inch. (18 m.). Of same form as gigas, but with a fine glassy lustre and olivaceous brown. Animal spotted. Small var. North Khasi. Shell: major diam. 1*0 inch (25*5 m.), minor diam. 0'68. Animal brown. Pale grey (dissected) var. Burmah? from G. Nevill. Shell: major diam. 0*95 inch (25*5 m.), minor diam. 0*75 (19*0 m.). 1 May be Helicarion resplendens, Nevill, J. A. S. B. 1877, p. 23. |