ACM^EA. 9 



A. RUBELLA Fabricius. PL 42, figs. 79, 80. 



Shell small, rounded-oval, conical, apex elevated, situated at the 

 anterior fourth of the shell's length ; front slope steep, straight or 

 concave, posterior slope convex. Surface smooth, showing faint 

 lines of growth. Color reddish-buff or orange ; inside of the same 

 color, the border flesh-colored. Length 5, breadth 4, alt. 2| mill. 



Finmark, Norway ; Greenland, 5-40 fms. 



Patella rubella FABR,, Fauna Gronl., p. 386, 1780. Tectura 

 (Erginus) rubella JEFFREYS, Ann. Mag. N. H., Mar., 1877, xxi, 

 p. 231. SARS, Moll. Arct. Norv. p. 121, t. 8, f. 5 ; t. ii, f. 11 

 (dentition), 1878. Pilidium fulvwn, in part, DALL, Am. Journ. 

 Conch, v, 1869. Acmcea rubella DALL, Proc. U. S. Nat. Mus. 

 1879, p. 337. 



This little shell is of a more erectly conical form than Pilidium 

 fulvum, and lacks radiating sculpture. It is smaller than A. vir- 

 ginea and not radiately painted, besides having the summit more 

 anterior and more elevated. The specimens before me are from 

 Greenland. It has been reported from the New England coast, but 

 I am not sure of the correctness of the determination. 



A. VIRGINEA Miiller. PL 10, fig. 13, 14. 



Shell small, oval, conical ; apex at or a little back of the anterior 

 fifth of the shell's length. Surface having delicate, almost obsolete 

 radiating striae and delicate growth lines. Color a delicate pink, with 

 numerous (about 13) pink rays. Upper part of the cone buffish- 

 white. 



Inside pink or white, center flesh-colored or opaque white. 



Length 9-10, breadth 6|-9, alt. 31-4 mill. 



Mediterranean and Adriatic Seas ; Atlantic from Nonvay and Ice- 

 land to the Canaries, Azores and Cape Verde Is., low water to 60 fms. 



Patella virginea MULL., Zool. Dan. Prodr. i, p. 43, 1776. GMEL., 

 Syst. Nat. xiii, p. 3711. Acmcea virginea HANLEY, Br. Mar. Conch, 

 p. 32, 1844. FORBES & HANLEY, Hist. Brit. Moll, ii, p. 437, t. 61, 

 f. 1, 2. DALL, Am. Journ. Conch, vi, p. 243, 1871. BUQUOY, 

 DAUTZ, & DOLLF., Moll, du Rouss. p. 478, t. 51, f. 12, 13. Tectura 

 virginea JEFFR., Brit. Conch, iii, p. 248 ; v, p. 200, t. 58, f. 4. 

 SARS, Moll. Reg. Arct. Norv. p. 121, t. ii, f. 10 (dentition). Patella 

 parva DA COSTA, Brit. Conch, p. 7. t. 8, f. 11, 1778, of DONOVAN 

 and MONTAGU. Lottia unicolor FORBES, Rep. JEg. Invert, pp. ] 35, 

 188,1844. L. pulchella FORBES, I. c., p. 137. Lottia pellucida 



