186 ACICULACEA. 







TritncateUa Cnribasensis REEVE, Conch. Syst. 11, t. 182, fig. 7. 



PFEIFFEK in Zeitsch. f. Mai. 1846, p. 182; Mon. Auric. 



Viv. ii. 185; Mon. Phan. Viv. ii. p. 7. 

 CHEMNITZ, ed. 2; Auric, p. 9, pi. i. figs. 35, 36; pi. ii. 



fig. 22 ; non pi. ii. figs. 2-4. 

 Truncatella Gouldii ADAMS, ined. 

 Truncatella succinea ADAMS, Proc. Bost. Soc. 1845, p. 12. 



DESCRIPTION. 



Animal not observed. 



Shell subperforated or grooved, subcylindrical, rather 

 solid, in its truncated state but slightly decreasing in size 

 towards the apex, reddish, or dark amber-colored, with 

 delicate ribs, which are but little curved, and often hardly 

 perceptible on the middle of the whorls ; suture slight ; 

 whorls not truncated, three or four, distinctly increasing in 

 size, equally convex, the last often smooth, slightly carinat- 

 ed on its base ; aperture subvertical, ovally elliptic, angu- 

 lar above ; peristome continuous, straight, thickened at its 

 connection with the penultimate whorl. 



Length, 78 ; diameter, 3 millimetres. Length of aper- 

 ture, 2\ millimetres. 



Geographical Distribution. Found among fine drift- 

 wood, sand, and marine shells received from the Florida 

 Keys. Is also quoted from Mexico and Alabama by 

 Kiister (Chemn. ed. 2), and from Cuba and Jamaica by 

 Pfeiffer. 



Remarks. This species shares the variations common 

 to the genus. Its ribs are hardly as strongly developed as 

 those of bilabiata and pulchella, nor are its whorls as con- 

 vex. It is more nearly allied to the following species with 

 which it appears to be confounded by Ktister. 



Both of my figures are from Chemnitz, fig. 2 represent- 

 ing the base of the shell. 



TRUNCATELLA SUBCYLINDRICA GRAY. 

 PLATE LXXV. FIGURES 5, 6, 8. 



T. vix rimata, cylindrica, costulis confertis regularibus, vel ad suturam 



