FERUSSACIA, SECTION PEGEA. 253 



defined below. Whorls 6 to 8, the upper very slowly increas- 

 ing and scarcely distinguishable, the last two much more 

 rapidly increasing in height, separated by a very oblique su- 

 ture, flat, the last cylindric, its height measured in front two- 

 thirds, at the back hardly half the total alt. Columella nearly 

 vertical, calloused, obliquely truncate at the base, in oblique 

 view indistinctly toothed within, sometimes with two small 

 denticles. Aperture elliptical, rounded below; a deep-seated 

 compressed lamella stands on the parietal wall ; outer lip un- 

 expanded, obtuse, weakly thickened outside, arched forward 

 in the middle, the margin connected by a strong callus. 

 Length 10, diam. 3.5, aperture 5 mm. (Kobelt). 



Algeria: around Bona, type loc. ; also widely distributed 

 in Constantine Province, often larger, 13 x 4.5, aperture 6 mm. 



Glandina lamellifera MORELET, Journ. de Conehyl. 1851, 

 p. 358, pi. 9, f. ISTornatellina I, PFR., Monogr. iii, 525. 

 Azeca, 1., PFR., Monogr. iv, 648; vi, 259. Ferussavia l. y 

 BOURGUIGNAT, Rev. et Mag. Zool. 1856, p. 330 ; Amen. Malac. 

 i, p. 200, pi. 19, f. 13-16; Malac. Algerie ii, p. 53, pi. 3, f. 39- 

 41. KOBELT, Iconogr. vii, p. 25, f. 1177. 



Two specimens figured show the variation in shape. It has 

 been reported from Domenico Reina, Alicuri island, but that 

 form probably belongs to F. carnea. 



38. F. AGR^CIA Bourguignat. PI. 44, fig. 14. 



Shell cylindric-lanceolate, rather solid, smooth, glossy, sub- 

 pellucid, corneous-bun ; spire long, acuminate, apex small, a 

 Httle obtuse. Whorls 7, subplanulate, regularly increasing, 

 separated by a paler superficial, obscurely duplicated suture, 

 the last whorl about two-fifths the total length. Aperture 

 subvertical, lunate, angular above, semioval, with a strong 

 whitish compressed and entering parietal lamella deeply 

 placed at the middle of the parietal wall. Columella short, 

 twisted, bicallose, a quite prominent median callosity and. a 

 smaller one at base of the columella, which appears as if trun- 

 cated. Peris'tome unexpanded, acute, thickened and whitish 

 within ; outer lip feebly arched forward ; margins joined by a 

 callus. Length 15, diam. 4.5, apert. 5.5 mm. (Bgt.) 



