OCR Text |
Show 1878.] LAND-SHELLS F R O M COSTA RICA. 73 Hab. Buena Vista, Costa Rica, at an altitude of 3000 feet. (Mus. Boucard.) This shell belongs to a group of Helices remarkable for their curiously toothed apertures, having as its nearest allies H. quadri-dentata, Brod., and H. auriculina, Petit. CYCLOTUS BOUCARDI, n. s. (Plate V. figs. 3, 4.) Shell widely and perspectively umbilicated, globosely turbinate, white, with a broad olive-chestnut band above and a narrower one just below the periphery, very finely longitudinally striated and crossed with rows of rugged irregular undulating oblique malleated ridges; whorls 6, convex, rapidly increasing, the last large and rounded; aperture nearly circular, white within ; peritreme simple, scarcely thickened, with a semilunar notch at the junction of the body-whorl. Diam. maj. 16 lines, min. 13, alt. 12. Hab. San Carlos, Costa Rica. A fine species with an excavated notch where the peritreme touches the body-whorl, as in Cyclotus mexicanus, Menke, from Vera Cruz. (Mus. Boucard.) BULIMUS JOSEPHUS, n. s. (Plate V. figs. 13, 14.) Shell perforate, elongately ovate, moderately solid, very finely obliquely striated, whitish, ornamented with somewhat distant irregular slightly undulating narrow olive-brown stripes, which become obsolete near the umbilical region ; spire elevately conical; sutures impressed; apex brownish yellow; whorls 6|, flatly convex; aperture ovate; somewhat effuse below ; outer lip expanded and flattened; columella triangular and flattened inwards, ending in a blunt rounded callus internally. Diam. 7 lines, alt. 16. Hab. San Jose, Costa Rica, on the trunks of acacia trees. (Mus. Boucard.) BULIMUS IRAZUENSIS, n. s. (Plate V. figs. 17-20.) Shell somewhat elongately ovate, rimate, moderately thin, longitudinally irregularly striated, shining, more or less longitudinally striped or freckled with black, and ornamented with numerous small white spots ; whorls 6, rather convex ; spire a little shorter than the aperture ; aperture oblong-ovate; lip thin, simple, tinged inside with rose-colour. Diam. 6 lines, alt. 12. Hab. Volcano of Irazu, Costa Rica, on low aromatic bushes on the eastern slope of the volcano. A variety of this pretty species occurs in which the prevailing colour is light brown, profusely sprinkled with little white spots. (Mus. Boucard.) BULIMUS NAVARRENSIS, n. s. (Plate V. figs. 15, 16.) Shell narrowly rimate, more or less elongately ovate, thin, irre- |