4S2 mr. G. f. angas on the [June 3, 



by a callus ; aperture elongately ovate, half the length of the shell, 

 lilac within. 



Diam. 6^, alt. 14 lin. 



Only one specimen. 



Bab. " Middle Zhorquin to Cuabre (low hills and flat ground) ' 



(Gabb). 



22. Glandina (Oleacina) strebeli, n. sp. (Plate XL. 



fig- HO 



Shell elongately ovate, thin, shining, finely longitudinally striated, 

 the striae nearly obselete on the last whorl, olive-green ; whorls 5|, 

 slightly convex ; spire elongately conical ; apex rounded and blunt ; 

 sutures simply impressed ; aperture narrowly elliptical ; outer lip thin, 

 nearly straight ; columella arcuate, margins united by a thin callus. 



Diam. 5, alt. 11| lin. 



Ilab. " Middle Zhorquin to Cuabre (low hills)" {Gabb). 



Not unlike G. turris, PfV., but only half the length, narrower, 

 more compressed at the base of the aperture, of a different colour, 

 and with a less number of whorls. 



23. Streptostyla boucardi, Pfr., var. ? 

 Spiraxis boucardi, Pfr., P. Z. S. 1861, p. 24. 



This species approaches very near to 8. boucardi, Pfr., of which 

 I am inclined to consider it a variety. 



Five specimens were found " on the ridge between Tilorio and 

 Zhorquin" (Gabb). 



" Animal light brown above, whitish below and posteriorly ; ten- 

 tacles dark brown ; carries the tip of the tail slightly turned up in 

 travelling" (Gabb). 



This species must not be confounded with 8. bocourti, Crosse & 

 Fischer. 



24. Streptostyla viridtjla, n. sp. (Plate XL. fig. 12.) 



Shell ovate, thin, shining, longitudinally striate at the upper part 

 of the whorls, the striae becoming almost obsolete on the lower half 

 of the last whorl, pale yellowish green throughout ; whorls 6, some- 

 what convex ; spire conoidal ; apex but slightly obtuse ; sutures 

 subcanaliculate ; outer lip very slightly sinuous, nearly straight in 

 the middle; columella strongly twisted and everted at the base; 

 aperture subauriform, nearly two thirds the length of the shell. 



Diam. 5, alt. 8 lin. 



Hab. Hills of Uren, Costa Rica. 



25. Streptostyla cylindracea, Pfr. 1 



Achatina cylindracea, Pfr., P. Z .S. 1846, p. 31 ; Reeve, Conch. 

 Icon. Achatina, pi. 18. fig. 91. 



As there is only a single specimen, I hesitate to identify it posi- 

 tively ; but it comes nearer to £. cylindracea than to any thing else 

 I can find. 



Costa Rica, 



