1879.] MOLLUSCA OF COSTA RICA. 481 



whorl somewhat broader and the 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, h 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. 1 ] lin. 



" From the hilly country," Costa Rica. 



This species, of which only a single example was found, is some- 

 what allied to G. isabellina, Pfr., but is smaller, of a different 

 colour and texture, and quite smooth, with no traces of the fine con- 

 centric 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 granu- 

 lated ; columella very slightly arcuate ; outer lip simple, nearly 

 straight ; aperture small, much shorter than the spire, narrowly 

 subquadrate. 



Diam. 6, alt. 1 ~i\ lin. 



Hub. "Hilly regions," Costa Rica. 



This species, which is allied to G. turris, Pfr., and G. pseuclo-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, irregu- 

 larly obsoletely striated, striae 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 



