HALIOTTS. 103 



H. rugosa Reeve, Conch. Icon., f. 59 (not H. rugosa, Lam. an 

 unidentifiable species, said by Lamarck to lack nacre). — H. strigata 

 Weinkauff, Conchyl. Cab., p. 20, t. 2, f. 8. 



A form closely allied, apparently, to H. pustulata. 



H. coccinea Reeve. PI. 10, figs. 54, 55 ; pi. 47, figs. 5, 6, 7. 



Shell oblong, depressed, the spire small, elevated, distance of apex 

 from margin one-fourteenth to one-seventeenth the entire length of 

 shell. Surface spirally ribbed ; color reddish-chestnut with very 

 irregular white patches and radiating zigzags ; perforations 5. 



The right side is nearly straight, the left curved ; body-whorl con- 

 vex. It is moderately solid ; the surface on both sides of the row of 

 perforations has close spiral cords, alternately larger and smaller, 

 their interstices usually occupied by minute spiral threads. The 

 spire is rather elevated, whorls about 2*. Inside it is silvery with 

 red and green reflections, a little blue showing in some lights ; mus- 

 cle impression not distinct ; columellar plate not wide, somewhat 

 flattened, a little truncated below. Cavity of spire visible from be- 

 low, but half concealed by the columellar plate. Perforations 5, 

 almost perfectly circular, situated on low tubercles and separated by 

 spaces of twice their own diameter. 



Length 52, width 30 mill; convexity 10 mill. 



Cape Verde Islands t 



H. coccinea Reeve Conch. Icon., f. 22, 1846. — Sowb. Thes. Conch, 

 v, f. 64, 95, 120.— Weinkauff, Conchyl. Cab., p. 41, t. 16, f. 5, 6. 

 — ? H. maculata Kuster, Weinkauff, Conchyl. Cab., p. 83, appen- 

 dix ; t. 2, f. 7. 



I do not believe this to be a variety of H. tuberculata ; it is a 

 wholly different thing. The spiral cords are far coarser than in 

 that species. I am far from placing confidence in the locality given 

 by Reeve. No one who has written on the Cape Yerde fauna has 

 found the species. It may prove to be an Indo-Pacific form. The 

 specimen before me is figured on pi. 47, figs. 5, 6, 7. 



H. elegans Koch. PI. 13, fig. 70. 



Shell elongated, rather narrow, subtruncate at base, spirally 

 densely and deeply sulcate, scale-ridged ferruginous-buff", marbled 

 and flamed with red. Inside lightly grooved, brilliantly pearly. 

 Spire very short. 



This beautiful and rare mollusk is distinguished as well by its 

 long drawn out form as by the shining nacre, which shows furrows 



