134 ABYSSINIAN HOMORUS. 



gate, the apex rather obtuse; suture lightly impressed, some- 

 what margined. Whorls 11 to 12, the upper ones convex, 

 the following rather flat; last whorl slightly more than one- 

 fourth the total length, attenuated below. Columella very 

 arcuate, narrowly truncated at the base of the oblique, sinu- 

 ate-oval aperture. Peristome simple, the right margin some- 

 what arched forward. Length 35, diam. 7.33 mm.; aperture 

 9 mm. long, 4 wide (P/r.). 



Northeast Africa: Sennaar (D'Arnaud). 



Achatina (Subulina) darnaudi PFR., Malak. Bl. 1855, p. 

 169 ; Novit. Conch, i, p. 81, pi. 22, f . 7, 8 ; Monogr. iv, p. 611. 

 Subulina darnaudi JICKELI Moll. Nord-Ost-Afrikas, p. 

 137. Ilomorus darnaudi KOBELT, Conch. Cab., p. 110. 



6. H. VARIABILIS (Jickeli). PL 58, figs. 45, 46. 



Shell imperforate, subulate, very delicately striated longi- 

 tudinally, opaque, waxy-corneous. Spire elongated, the apex 

 slightly mamillar; suture oblique, rather deep, sometimes 

 submarginate. Whorls 10, convex, the last descending, one- 

 third the length or more. Aperture suboblique, piriform, 

 acuminate above, widened at the base ; columella arcuate, long, 

 obliquely truncate, the lip thin, acute, sometimes covered with 

 cuticle. Length 25.5, diam. 7, height of mouth 7.25, width 

 4 mm. ; penult, whorl 4.5 mm. high, 6 wide (Jickeli) . 



Northeast Africa : plateau of Asmara, Abyssinia, under the 

 bark of fallen candelabra Euphorbias ( Jick.) ; Nefasit, Ery- 

 thraea (Gen. Boccard). 



Stenogyra variabilis JICKELI, Malak. Bl. xx, 1872, p. 105. 

 Subulina variabilis JICKELI, Moll. Nord-Ost-Afr. p. 139, pi. 

 5, f. 23-25; pi. 2, f. 4 (dentition of var. 3). Achatina vari- 

 abilis PFR., Monogr. viii, p. 287. Homorus v., KOBELT, Conch. 

 Cab. p. 101. Subulina v., POLLONERA, Boll. Mus. Zool. ed 

 Anat. Comp. Univ. Torino xiii, no. 313, p. 8. 



Besides the typical form, Jickeli distinguishes two varieties, 

 which Bourguignat has elevated to species and named as 

 below. Pollonera states that the specimens collected by Gen. 

 Boccard at Nefasit show intergradation between these forms. 



