GIBBULA. 213 



G. HEMPRICHII Issel. PI. 47, fig. 100. 



Shell minute, orbiculate-conoid, umbilicate, under a lens longi- 

 tudinally striate, shining, whitish, painted with oblique chestnut 

 streaks, spotted with brown ; apex rather obtuse ; whorls 5, regularly 

 increasing, rather convex, flattened at the distinctly impressed 

 sutures, the last whorl scarcely equalling half the total altitude ; base 

 rounded or obscurely subangular; aperture quadrate-rounded; 

 peristome simple, acute; columella subtruncate at base ; umbilicus 

 rather narrow, funnel-shaped. Alt. 2t, diam. 2-1 mill. (Issel.) 



Gulf of Suez. 



T. hemprichii ISSKL, Malac. del Mar Rosso (1869). SAVIGNY 

 Descript del'Egypte, Coq., t. 3, f. 6. 



G. SISMOXD/I; Issel. PL 47, figs. 94, 95. 



Shell small, conoidal, imperforate, minutely transversely striate, 

 greenish, obtuse at apex; whorls 4^, slowly increasing, slightly 

 convex, separated by impressed sutures; last whorl more than half 

 the total length, angular at base; base flattened, ornamented with 

 4 concentric costulse ; aperture very oblique, subcircular. 



Alt. 4, diam. 4 mill. (Issel.) 



Suez. 



T. sisimondas ISSEL, Malac. Mar Rosso, p. 225, t. ii, f. 13. 

 In general form this species approaches T. tumidus Mont., but it 

 is distinguished by having no umbilicus, and by its greenish color. 



(Lsel.) 



G. SPURCA Gould. PL 51, figs. 22, 23. 



Shell small, solid, globose-conic, everywhere sculptured with fine, 

 shallow, revolving alternate grooves and elevations; shining, of a 

 dingy yellowish color, delicately variegated with oblique zigzag 

 dusky lines, the two colors in about equal proportions, a series of 

 somewhat conspicuous quadrate dusky and yellow spots just below 

 the suture ; whorls 4 or 5, ventricose ; suture deeply impressed ; the 

 last subangular at periphery ; base moderately conical, imperforate 

 or minutely umbilicated ; aperture very oblique, circular ; columella 

 rounded, arcuate ; lip sharp, smooth within and subnacreous. 



Alt. 3-10ths, diam. 3-8ths inch. (Gould.) 



Madeira Is. 



Has most of the characters of T. fermoui but is much smaller, 

 wants the peculiar channelled shoulder of the whorls, and the widely 

 open umbilicus. (Gould.) 



