PSAMMOBIA. 271 



P. VESPERTINA, Cliemiiitz. 



Rather strong, somewhat compressed, rayed with livid pink 

 and white, merely marked with obsolete concentric striae ; hinder 

 end very bluntly biangulated ; hinder dorsal edge almost straight, 

 and scarcely sloping ; ligament large, and prominent. 



Plate xix. fig. 1, -2. 



Lux vespertina, Chemn. Conch. Cab. vol. vi. p. 72, pi. 7, f. 5.9, 60. 



TclUna depressa, Penn. (not Linn.) Brit. Zool. ed. 4, vol. iv. p. 87, pi. 47, f. 27. 



variabilis, Pult. in Hutchins' Dorset, p. 29. — Don. vol. ii. pi. 41, f. 2. 



Solen picftcs (partly), Spengler, Skrivt, af Naturhist. Sclskab. vol. iii. part 2, 



p. 107. 

 TelU?ia Gari, Poli (not Linn.), Test.Sicil. pi. 15, f. 19, 21, 23. 

 Solen vesperlinus, Mont. Test. Brit. p. 54. — Linn. Trans, vol. viii. p. 47. — Dor- 

 set Catal. p. 29, pi. 5, f. 1.— Turt. Conch. Diction, p. 1G3. 

 —Wood, General Conch, p. 135, pi. 33, f, 2, 3. 

 Tellina alhida, Dillw. (of Linn. ?) Recent Shells, vol. i. p. 78. 

 Psammohia ve>tperti)ia. Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 173. — Turt. Di- 

 thyra Brit. p. 92, pi. 6, f. 10 (young). — Brown, Illus. 

 Conch. G. B. p. 102, pi. 40, f. 3.— Philippi, Moll. 

 Sicil. vol. i. p. 22, and vol. ii. p. 21. — Hani,. Recent 

 Shells, p. 57. — Cuv. Regne Anim, (ed. Croch.) pi. 

 lll,bis. f. 2 (animal). 

 Psammohia Jiorida, Laiiarck, Anim. s. Vert. (ed. Desh.) vol. vi. p. 174 (fide 



Pay and. and Philippi). 

 Sanguinolaria vespertina, Flem. Brit. Anim. p. 4G0. — Brit. Marine Conch, 

 p. 65. 



The Setting Sun, as the present species, from its peculiar 

 style of colouring, has poetically, and not inappropriately, 

 been termed, is of an oval-oblong shape, nearly equilateral, 

 tolerably strong, opaque, and rather compressed (particu- 

 larly in front). The surface, beneath the ashy olive- 

 coloured epidermis, which partly conceals it, and which, 

 except in the very young, is destitute of lustre, is shining, 

 and only obsoletely striated in a concentric direction. 

 The colouring consists of numerous alternate rays of car- 

 nation or livid pink and white, the preponderance of each 

 hue varying in different examples. The coloured rays are 



