OCR Text |
Show 1879.] MOLLUSCA O F COSTA RICA. 481 whorl somewhat broader and tbe aperture more effuse than in the Mexican specimens in the British Museum. This species is allied to G. conularis, Pfr., and G. obtusa, Pfr., the former of which is from Mexico, and the latter from Nicaragua. The Costa-Rica specimens are larger than the typical ones. The delicate concentric lines (seen through the lens) by which the whorls are crossed are characteristic of this species. The animal, which is of the same pale isabelline colour as the shell, '3 entirely retractile. 19. GLANDINA AURANTIACA, n. sp. (Plate XL. fig. 8.) Shell fusiformly oblong, moderately thin, smooth, shining, bright tawny orange, darker towards the base of the columella ; whorls 5 J, slightly convex ; spire papillose, obtuse ; sutures impressed, and of a dark purple colour; columella slightly oblique, shortly truncated in front; outer lip moderately arcuate, simple, not effuse towards the base; aperture elliptically oblong, half the length of the shell, pale rosy purple within. Diam. 5 alt. 11 lin. " From the hilly country," Costa Rica. This species, of which only a single example was found, is somewhat allied to G. isabellina, Pfr., but is smaller, of a different colour and texture, and quite smooth, with no traces of the fine concentric lines characteristic of that species; and, moreover, it has the sutures banded with purplish brown. 20. GLANDINA (OLEACINA) ANOMALA, n. sp. (Plate XL. fig. 9.) Shell elongately oblong, turreted, thin, shining yellowish olive-green, dark brown towards the apex ; whorls 7, very slightly convex, flatly longitudinally striate, the striae becoming obsolete towards the lower portion of the whorls, especially on the last; spire very large and obtuse; apex rounded, tumid; sutures strongly granulated ; columella very slightly arcuate; outer lip simple, nearly straight; aperture small, much shorter than the spire, narrowly subquadrate. Diam. 6, alt. 17^ lin. Hab. "Hilly regions," Costa Rica. This species, which is allied to G. turris, Pfr., and G. pseudo-tur-ris, Strebel, is remarkable for its large swollen obtuse spire and small aperture. The longitudinal striae do not come quite down to the sutures, as in G. turris; and the sutures are strongly granulated. 21. GLANDINA (OLEACINA) MITRIFORMIS, n. sp. (Plate XL. fig. 10.) Shell elongately ovate, turreted, moderately thin, shining, irregularly obsoletely striated, striee finer and closer on the upper whorls, olive-chestnut, with a narrow yellow zone next below the suture; whorls 5, slightly convex, the last more than half the entire length of the shell; spire short, conical, apex rather obtuse; columella slightly arcuate ; outer lip simple, nearly straight; margins united PROC. ZOOL. Soc-1879, No. XXXI. 31 |