l42 TRTJNCATELLID^E. 



18. Truncatella Adamsi. 



Shell scarcely rimate, rather solid, cylindrical, shining, horn- 

 coloured, sculptured with rather distant, obtuse, longitudinal 

 ribs and minute stripe between them ; remaining whorls four, 

 moderately convex, the last slightly keeled in front ; aperture 

 perpendicular, obliquely ovate ; peristome thickened, indistinctly 

 duplicate ; outer margin narrowly spreading. Length 4|, 

 breadth 2 mill. 

 Truncatella scalariformis, C. B. Adams in Proc. Zool. Soc. 1845, 



p. 12 ; not Reeve. 

 Truncatella Adamsi, Pfr. in Zeitschr. f. Malak. 1846, p. 189 ; 

 Mon. Auric, p. 194. 



C. B. Adams, Contr. to Conch, no. 1. p. 16. no. 9. p. 182. 



Jay, Catal. 1850, p. 252. n. 5765. 



Kiist. Hon. p. 16. n. 15. 



H. and A. Adams, Gen. rec. Moll. ii. 311. 



Hah. Jamaica. 



19. Truncatella scalaris. B.M. 

 Shell imperforate, cylindrical, oblong, truncate, very solid, 



opake, brownish flesh-coloured, sculptured with distant, strong, 

 obtuse, nearly rectilinear ribs ; suture deep ; remaining whorls 

 three and a half to four, convex, gradually increasing, the last 

 short, slightly compressed in front ; aperture perpendicular, 

 small, semiovate, slightly angulated above ; peristome con- 

 tinuous, thickened ; columellar margin callous, adnate. Length 

 5, breadth 2 mill. 



Rissoa scalaris, Michaud, Desc. du genre Rissoa, p. 21. f. 31, 32. 

 Truncatella costata, Pfr. in Wiegm. Arch. f. Nat. 1839, i. p. 356. 



C. B. Adams, Contr. to Conch, no. 1. p. 16. 



Poey, Memor. i. p. 393. 

 Truncatella Cumingii, C. B. Adams in Proc. Bost. Soc. 1845, p. 12. 

 Truncatella scalaris, Pfr. in Zeitschr. f. Malak. 1846, p. 188 ; 

 Mon. Auric, p. 194. 



Jay, Catal. 1850, p. 252. n. 5775. 



C.B. Adams, Contr. to Conch, no. 9. p. 182. 



KM. Mon. p. 8. n. 4. t. 1. f. 32-34. 



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

 Truncatella crassicostata, Gray, B. M. 

 Truncatella crassicosta, " Sow." H. Adams, Gen. 



Hab. Cuba and Jamaica. 



20. Truncatella clathrus. 



Shell scarcely rimate, nearly cylindrical, solid, flesh-coloured. 

 <culptured with rather crowded, arched, slightly compressed 



