TRUNCATELLIDJE. 143 



ribs ; remaining whorls four, convex, contracted near the suture, 

 the last imperceptibly compressed in front; aperture perpen- 

 dicular, oblong-ovate ; peristome continuous, much thickened ; 

 right margin reiiexed, columellar margin appressed. Length 

 4i, breadth 2 mill. 



Truncatella clathrus, Lowe in Zool. Jonrn. v. p. 303. 



Reeve, Conch. Syst. ii. pi. 182. f. 3. 



Pfr. in Zeitschr. f. Mai, 1846, p. 188 ; Mon. Auric, p. 195. 



Jay, Catal 1850', p. 252. n. 5768. 



Shuttlew. Diayn. n. Moll. no. 7. p. 155. 



Kiist. Mon, p. 15. n. 14. 



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

 Hah. Portorico and St. Thomas. 



Similar to T. scalaris, but differing by the ribs being more 

 numerous and arcuate, and the last whorl less abbreviated. 



21. Truncatella striatula. B.M. 



Shell rimate, subperforate, turrited, truncate, very faintly 

 striated, opake, pale flesh-coloured : suture simple, median ; 

 remaining whorls five to six, moderately convex, increasing 

 regularly, the last rounded ; aperture perpendicular, elliptical, 

 angulated above, brown within; peristome continuous, with 

 the right margin slightly expanded; columellar margin dilated, 

 somewhat spreading. Length 6-10, breadth 3-4 mill. 

 Truncatella striatula, Menke, Moll. Nov. Holland, p. 9. 



Pfr. in Zeitschr./. Mai. 1846, p. 187; Mon. Auric, p. 196. 



Kiist. Mon. p. 14. n. 10. t, 2. f. 32, 33. 



H. and A. Adams, Gen. rec. Moll. ii. p. 196. 

 Hah. Western shore of Australia. 



This shell is very similar to that of the genus Tomichia, Ben3., 

 and may possibly belong to that genus. 



Undescribed species. 



Truncatella striata, Soto, in Phil, Mag. teste Reeve, Conch. Syst, 

 ii. pi. 182. f.4. Perhaps identical with T. striatula, Menke ? 

 Truncatella lirata, Poet/, Memor. ii. 



Truncatella aurantia, Gould, ] , . T , . . , , 



Truncatella porrecta, Gould, U uoted ™ IL <»"!-[■ ^d<tms, 

 Truncatella rostrata, Gould, J Lren - rec ' MulL 



