98 HALIOTIS. 



The pimpled sculpture of this shell is of a much more prominent 

 character than that of dringii, concinna or gemma. (RveJ) 



North Coast of Australia. 



H. papulata RVE. Conch. Icon., t. 17, f. 69, 1846. 

 Probably immature, but not a young ovina as Sowerby surmises. 



H. GEMMA Reeve. PJ. 7, fig. 37, double natural size. 



Shell somewhat orbicularly ovate, flatly convex, left side rather 

 broad ; spirally tuberculated, radiately very beautifully minutely 

 plicately scaled ; perforations a little tubiferous, four or five open ; 

 yellowish, stained with scarlet and green. 



The surface of this beautiful little species besides being tubercu- 

 lated, is covered with minute scales, which present a rather more 

 prominent character on the left side beneath the perforations. 



(Jfoe.) Habitat unknown. 



H. gemma RVE. Conch. Icon., f. 67, 1846. 



This is evidently a very young shell, whether a distinct species or 

 not can only be determined by an examination of the type. 



H. DOHRNIANA Dunker. PI. 7, figs. 39, 40, 41. 



Shell ovate-oblong, subelliptical, little convex, white and rose 

 variegated, with large brown or greenish, often subquadrate spots 

 toward the margin; sculptured with oblique folds and 34 to 36 

 close, subimbricately nodose spiral riblets ; transversely striated. 

 Perforations 4, subtubulose ; part between perforations and lip slo- 

 ping, subexcavated. Columella wide, flat. Nacre brilliant silvery, 

 a little iridescent. 



There lie before me three specimens of this species, having much 

 the same general form and sculpture ; one is more elliptical in con- 

 tour. The moderately convex shell is covered with closely crowded 

 spiral riblets, of about equal size, and 34 to 40 in number. Toward 

 the margin they have blunt, erect scales, and here and there are 

 nodose. The margin is sloping, concave in the middle, and trav- 

 ersed by 6 to 8 cords like the spirals of the upper surface. Four 

 holes are open. The inner lip is flat aud pretty wide ; the nacre 

 Avhite and unusually brilliant, but only slightly iridescent. (Dun- 

 ker.~) 



New Hebrides. 



H. dohrniana DKR. in Novit. Conch., p. 48, t. 15, f. 13-15. 



This seems to be very closely allied to certain forms of H. pustu- 

 lata Reeve. 



