98 LTTT0K1NID^>. 



R. PAn\ A, Da Costa. 



Sometimes with longitudinal ribs, sometimes smooth : outer 

 lip marked externally M-ith a curved and oblique chestnut brown 

 line at its upper or posterior corner. Peristome usually edged 

 with brown. A labial varix in the adult. 



Plate LXXVI. f. 2, 6 ; Plate LXXVII. fig. C, 7; Plate LXXXII. f. 1 to 4. 



Turho jKirvus, Da Costa, Brit. Conch, p. 104. — Mont. Test. Brit. vol. ii. p. 310. 

 — Maton and Rack. Trans. Linn. Soc. vol. viii. p. I?]. — 

 Rack. Dorset Catalog, p. 50, pi. 1 9, f. 4. — Turt. Conch. 

 Diction, p. 215. — Dillw. Recent Shells, vol. ii. p. 857. — 

 Wood, Index Testae, pi. 31, f. 9.9. 

 „ suhhiteus and areus, Adams, Trans. Linn. Soc. vol. iii. pi. 1 3, f. 1 5, 1 6, 29, 



30 (probably). 

 „ costalus, PuLTENEV, Hutchins, Hist. Dorset, p. 45, partly. — Lam. Anim. 



s. Vert. (ed. Desh.) vol. ix. p. 219, in part (fide Recluz). 

 ., htcteus, DoNOV. Brit. Shells, vol. iii. pi. 90 (badly). 

 Cingula parva, Fleming, Brit. Animals, p. 306. — Brit. Marine Conch, p. 176. 

 „ alba, Fleming, Biit. Animals, p. 309, from types.— Brit. Marine Conch, 

 p. 183. 

 liissoa parirt. Gray, Proc. Zoolog. Soc. 1833, p. IIG. — Johnston, Berwick 

 Club, vol. i. p. 272. — Macgilliv. Moll. Aberdeen, p. 149. — 

 Brown, Illust. Conch. G. B. p. 11, pi. 9, f. 55, 56. — Alder 

 JIoll, Northiimb. and Durh. p. 54. — Potiez and Micn. Galerie 

 Douai, Moll. vol. i. p. 274. — Recluz, Revue Zool. Soc. Cuvier. 

 1843, p. 7. 

 „ alfja, .Johnston, Berwick Club, vol. i. p. 272. — Macgilliv. Moll. Aberd. 

 p. 149 (worn), fide Jeffreys from type. — Brown, Illustr. 

 Conch. G. B. p. 12, pi. 9, f. 16 to 19. 

 „ obscura, Philippi, Moll. Sicil. vol. ii. p. 127, pi. 23, f. 10 (from specimens). 

 ? „ fuscala. Brown, Illust. Conch. G. B. p. 10, pi. 9, f. 72. 



We consider the curved line of colour, which externally 

 adorns the upper corner of the outer lip, as the distin- 

 guishing characteristic of this shell, by which examples of 

 it, even wlicn immature, may be known from the dif- 

 ferent varieties of costulata, rufilahris, and inconspicua, cer- 

 tain individuals of which approach them in most other 

 particulars. In considering the interrupta of authors * to 



* Montagu's own example is a finely coloured scmistriaia, but bis delineation 

 clearly proves that it was not that species which ho intended to indicate. 



