TRCNCATELLIDJE. 139 



maining whorls three to four, nearly flat, elongate, the last 

 rounded in front ; aperture perpendicular, oblong-ovate ; peri- 

 stome simple, thin ; right margin imperceptibly expanded ; colu- 

 mellar margin receding, adnate. Length 4, breadth scarcely 

 li mill. 



A. Perfect form : — 



Turbo truncatus, Montagu, Test. Brit. p. 300. pi. 10. f. 7. 



Turt. Diet. n. 65. 

 Truncatula truncata, Leach, Catal. ? 

 Turritella truncata, Fleming, Brit. Anim. p. 103. n. 219. 

 Truncatella Montagui, Loire in Zool. Journ. v. p. 303. 



Thomps. Prep. Fauna Lrel. p. 255. 



Reere, Conch. Syst. ii. pi. 182. f. 1. 



Thorpe, Brit. Mar. Conch, p. 146. f. 75. 



Pfr. in Zeitschr. f. Mai. 1846, p. 185 ; Mon. Auric, p. 190. 



Jag, Catal. 1850', p. 252. n. 5771. 



Forbes and Hani. Brit. Moll. iv. p. 317. pi. 99. f. 1. 



Kiister, Mon. p. 6. n. 2. t. 1. f. 24-26. 



If. and A. Adams, Gen. rec. Moll. ii. p. 311. 

 Zeanoe nitida, Leach, Brit. Moll. 198. 



Truncatella truncatula, 31. E. Gray, Fig. Moll. Anim. pi. 123. 

 f. 14. 



j3. Smaller, glassy. Length 3, breadth f mill. 



B. Imperfect form : — 



Turbo subtruncatus, Montagu, Test. Brit. p. 300. pi. 10. f. 1. 



Turt. Diet. n. 64. 

 Turritella subtruncata, Fleming, Brit. Anim. p. 303. n. 217. 

 Glaucothoe Montagui, Leach, Brit. Moll. 199. 



Hub. Britain, Ireland, Sicily, Istria. 



12. Truncatella scalariformis. 



Shell rimate, elongate, cylindrical, rather solid, pale yellowish, 

 sculptured with thread-like, rectilinear ribs, which are narrower 

 than the spaces between them ; suture deep, slightly crenate by 

 the prominent ribs; remaining whorls five, rounded, the last 

 not compressed in front; aperture perpendicular, roundish- 

 ovate ; peristome free, expanded, rather angularly produced 

 above. Length 6, breadth 2 mill. 



Truncatella scalariformis, Reeve in Proc. Zool. Soc. 1842, p. 197; 

 Conch, Syst. ii. pi. 182. f. 6. 

 Pfr. in Zeitschr. f. Mai. 1846, p. 186. n. 7 ; Mon. Auric, p. 191 . 

 jay, Catal. 1850, p. 252. n. 5774. 



