182 HELIX- JACOSTA. 



H. HAMUD.E Kobelt. PL 34, figs. 74, 75. 



Shell openly umbilicated, depressed, suborbicular, distinctly car- 

 mated, buff-brown, variously maculated and interruptedly banded 

 with brown or chestnut, especially above ; spire convex-depressed, 

 apex small, smooth. Whorls 5-6, the upper slightly convex, the 

 lower carinated, carina following the suture ; all whorls sculptured 

 with close oblique riblets, noduliferous toward the sutures ; last 

 whorl a trifle dilated, very little descending in front, surrounded in 

 the middle by a distinctly subserrate carina, convex above and 

 below. Peristome simple, very distinctly, subremotely labiate within. 



Alt. 8, greater diam. 13i, lesser 12 mill. 



Porto Farina, northern Tunis. 



H. hamudce KOB., Nachrichtsbl. D. M. Ges. 1886, p. 101; 

 Rossm. Icon. n. f. iv, p. 20, f. 536. 



Quite a number of species grouping immediately around H. 

 amanda Rossm., occur in Tunis, Bgt. and Letr. distinguishing seven ; 

 but none seem to be identical with this species, the name of which, 

 besides has priority. (Kob.~) 



H. ENICA Letourneux & Bourguignat. PI. 40, figs. 58, 59, 60. 



Shell depressed, very widely umbilicated, sublenticular, distinctly 

 bicarinate, rather solid, rudely and closely costellate above and 

 below ; gray-whitish, with inconspicuous spots and bands of rufous- 

 brown ; spire depressed-convex, apex minute, horny, smooth. 

 Whorls 5, the last with a serrated, sublamellose, compressed periph- 

 eral carina, slightly convex between the keels. Aperture very 

 oblique, rhomboidal, channelled outwardly; peristome acute, dis- 

 tinctly biangulate. 



Alt. 7, greater diam. 18, lesser 16 mill. 



Dschebel Zaghuan, Tunis. 



H. enica L. & B., Prodr. Mai. Tunisie, p.. 88. KOBELT in Rossm. 

 Icon. N. F. iv, p. 17, f. 532. 



The difference from H. idia is not great, but is constant, so that 

 the separation of the two seems expedient. 



H. ZEUGITANA Letourneux & Bourguignat. PI. 40, figs. 45, 46. 



Shell profoundly and openly umbilicate, depressed, acutely car- 

 inated, entire flat above, slightly convex below ; rather thin, scarcely 

 shining, greyish-white, here and there obsoletely spotted with brown ; 

 sculptured all over with nearly regular white riblets; spire flat, 



