86 HALIOTIS. 



below. Perforations 6 to 8, round, separated by spaces longer than 

 themselves. Length 95-105, breadth 63-73, convexity 15-20 mill. 



Atlantic Coast from the Channel Islands to the Canaries, and the 

 entire Mediterranean Sea. 



H. tuberculata Linne, Syst. Nat. x, p. 1256. — Jeffreys, Brit. 

 Conch, iii, p. 279 ; v, t. 60, f. 2.— Hidalgo, Mol. Espan. t. 29, f. 

 3. — Weinkauff in Kiister's Conchylien Cabinet, p. 3, and of 

 authors generally. — H. vulgaris DaCosta, Brit. Conch., t. 2, f. 1, 2. 



(Var. lamellosa Lam.) 



H. striata Linn., Syst. Nat. xii, p. 1256 (teste Hanley, Shells 

 of Linnaeus). — "Weinkauff, 1. c. (as var. of tuberculata). — H. 

 lamellosa Lam. Anim. s. Vert, vi, 2d pt., 217, 1822. — Buquoy, 

 Dautz. & Dollf., Moll, du Rouss. i, p. 426, t. 52, f. 1-7 ; and of 

 authors generally. — H. tuberculata of some authors. — H. parva 

 Risso Hist. Nat. Eur. Merid. iv, p. 252. — H. marmorata, H. 

 glabra and H. bistriata O. G. Costa Cat. sist., p. 117, 118. — H. re- 

 ticulata Rve. Conch. Icon., f. 48. — Monts, Nom. Gen. e Spec, p. 38. 

 — H. glabra Dillw.; H. marmorata and bicolor Costa ; H. neglecta 

 Phil. 



This is a very variable species, allied closely to several species of 

 Japan and elsewhere, but the only one of the genus inhabiting 

 European seas. Young shells are more brightly colored than old 

 ones, as usual in the genus. The following varieties may be recog- 

 nized ; but their characters have no constancy, and intermediate 

 specimens are numerous. 



Color-var. reticulata Reeve. PI. 24, fig. 66 ; pi. 47, fig. 8. 



Surface without radiating lamella? or folds ; coloration generally 

 mottled or with triangular spots. 



This has received the following names : reticulata Reeve, secer- 

 nenda Monts, glabra Costa, marmorata Costa, bicolor Costa, tuber- 

 en lata var. lucida Requien, varia Risso. 



Mediterranean Sea. 

 Var. lamellosa Lamarck. PI. 3, figs. 9, 10. 



Like the type in contour, except that the lip-margin is frequently 

 straighter than the other side ; the surface more strongly striated 

 spirally, and having coarse, prominent, radiating wrinkles or 

 lamellae above. Length 72, breadth 45 mill. 



Mediterranean and Adriatic Seas. 



