HALIOTIS. ] 13 



surface having strong, elevated, radiating wrinkles or lamella?, but 

 no spiral markings when adult; perforations 6 to 11, small, subcir- 

 cular, separated by spaces greater than their own diameter. 



The two sides are about equally curved ; the convexity varies 

 with age. Color yellowish-gray, the folds usually stained with coral- 

 red. Surface dull, with fine oblique growth-wrinkles and coarse, 

 prominent, less oblique elevated and wavy radiating lamellae. Spire 

 low, composed of about 3 whorls, the last angulated at the row of 

 perforations. Inside pearly, many-colored, red predominating in 

 young specimens; muscle-scar large, rounded, very rough, especially 

 in old shells, which often have coppery stains inside ; columellar 

 plate rather broad (one-seventh to one-tenth the width of shell), 

 sloping inward, its face a little concave ; not at all truncated at base. 

 Cavity of spire large, showing about 1J whorls from below. 



Length 138, width 111 mill.; convexity 42 mill. 



Length 128, width 102 mill. ; convexity 27 mill. 



Length 170, width 140 mill.; convexity 45 mill. pd^Y 



Cape region of South Arrt&fim. 



H. midce LINN. Syst. Nat. x, p. 779. HANLEY, Shells of Linn- 

 seus, p. 409. REEVE, Conch. Icon., f. 16. SOWB. Thes. Conch, v, 

 p. 31, f. 31. WEINKAUFF, Conchyl. Cab., p. 7, t. 2, f. 9, t. 3, f. 3. 



Belongs to the group of sanguinea and capensis. It is much lar- 

 ger than the former, with less excentric apex, stronger sculpture and 

 more rounded outline ; from capensis the different sculpture will sep- 

 arate it. 



Var. ELATIOR. PL 21, figs. 17, 18, 19, 20, 21. 



Shell very deep and bowl-like, the spire more elevated than in 

 typical H. midce. Sculpture of outer surface unknown. Inside 

 light, clouded with red, green and purplish, and having a few 

 olive-brown stains. Muscle-scar large, very rough, extending upon 

 the spiral columella. Peristome produced beyond the body-whorl, 

 free, continuous ; the columellar margin wide, sloping strongly in- 

 ward. 



Length 130, width 112, convexity 53 mill. 



Length 125, width 110, convexity 56 mill. 



I had at first considered these shells a new species, but further 

 study convinced me, after figuring them, that they are merely a 

 small form of H. midce. The specimens are very old and so much 



