56 LITTORINID.E. 



L. PALLiDULA, Da Costa. 



Almost always broader than long, flattened beneath, peculiarly 

 expanded at the mouth : lacuna large in the adult, and equal to 

 two-thirds the length of the shell, sometimes absent in young 

 specimens. 



Plate LXXII. fig. 1, 2, and fig. 3, 4 (aspatula). 



Neriia pallidtda. Da Costa, Brit. Conch. p.'51, pi. 4, f. 4, 5. — Donov. Brit. 

 Shells, vol. i. pi. 16, f. 1.— Mont. Test. Brit. vol. ii. p. 4G«. 

 — Maton and Rack. Trans. Linn. Soc. vol. viii. p. 226. — 

 Rack. Dorset Catalog, p. 57, pi. 20, f. 4, 5. — Dillw. Recent 

 Shells, vol. ii. p. 986.— Wood, Index Testae, pi. 35, f. 21. 



Turbo pallklidus, TuRT. Conch. Diction, p. 192, f. 24, 25, 85, 86, 



Naticu palUdula, Blainv. Faime Franq. Moll. pi. 14, f. 6. — Fleming, Brit. 

 Animals, p. 320. — Brit. Marine Conch, p. 150. — Brown, 

 Illust. Conch. G. B. p. 25, pi, 13, f, 18, 20. 



Lacuna „ TuRT. Zoolog. Journ. vol. iii. p. 190. — Johnston, Berwick 



Club, vol. i. p. 270, — Macgilliv, Moll. Aberd. p. 145. — 

 Hanl. Brit, Marine Conch, p. xxxii. f. 85. 

 „ „ var. ? imtula, Hanley, Brit, Marine Conch, p. xxxvii. f. 83, 



The broad canal and iVa^ica-like aspect of this most 

 characteristic species of Lacuna readily enable us to sepa- 

 rate it from its British congeners. It is flattened under- 

 neath, but above is almost hemisplierically convex, and of 

 a somewhat obliquely subtriangular-ovate form, that is for 

 the most part broader than long, but occasionally is some- 

 what more circular than usual. From its thinness it is a 

 little translucent, and is covered with a rather dull and 

 dirty yellow epidermidal coat, beneath which the shell 

 is of a whitish hue, and never banded nor variegated 

 with any other colour. The surface is almost smooth ; 

 numerous wrinkles of increase, and occasionally a few very 

 obscure spiral ridges may, however, be descried. Of the 

 three volutions vi'hich compose the shell, the two upper 

 scarcely occupy any appreciable portion of its area, being 



