TRUNCATELLA. 565 
ComparRaTIVE TABLE oF THE SpEcIES OF TRUNCATELLA. 
Nomen. Forma. i Peristoma Anfr. i Aper- atri 
Seulptura. Basis, aperture. superstites. Long. | Diam. sa Patria. 
“ eS : a oe 3 . mm, | mm. | mm. 
| earibseensis, ow. ...| subcylindrica, costulis confertis | breviter carinato- simplex, rectum. 3-4 7-8 3 24 | E. Mexico. 
| parum attenu-| subrectis, sape| cristata. 
ata, rubella, | in medio anfrac- 
succinea vel| tuum evanes- 
flavida. centibus. 
bairdiana, C. B. Ad.| cylindracea, pel- | plicis longitudin- | crenata, vix com- | duplex, _ exter- 4 5 1} 13 | W. Mexico, S. 
i lucida,succineo-| alibus, subcon- | pressa. num criste- : Panama. 
I cornea. fertis, obtusis. forme. 
_bilabiata, Pfr. ...... eylindracea, gra- | costissubarcuatis, | subcompressa, duplex, ext. 43-5 54 1¥ 14 | Yucatan. 
cilis, fusca. elevatis, obtusis, | callosa. album patens, 
interstitia int. porrectum. 
eequantibus, 
N.B.—Truncatella (?) dubiosa, C. B. Adams [ Ann. Lyc. Nat. Hist. N. York, v. p. 435 
(not figured), ¢f. Pfeiffer, Monogr. Auric. p. 178], found with 7. bairdiana, is either a 
young specimen of this or of some other Truncatella. The Truncatella (?) sp., quoted 
by P. Carpenter, Catal. Mazatlan Shells, p. 364, as found “ off Spondylus,” probably 
does not belong to. this genus, on account of its habitat, which indicates a true 
marine shell. 
1. Truncatella caribzensis. 
Truncatella caribeensis, Sowerby, in Reeve’s Conch. Syst. ii. p. 182, fig. 7 (1842) '; Kiister, in 
Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Truncateila, p. 9, t. 1. figg. 35-37, and t. 2. 
fig. 1-4, 22 (full-grown), 5, 6 (young)’; Pfeiffer, Zeitschr. f. Malac. 1846, p. 182°; 
Monogr. Auric. p. 185‘; Catal. Auric. Brit. Mus. p. 134°; Binney, Land and Freshw. 
Shells of N. Am. iii. p. 98, fig. 198°; Tryon, Am. Journ. Conch. iv. p. 14, t. 18. 
figg. 27, 28". 
Truncatella succinea, C. B. Adams, Proc. Bost. Soc. Nat. Hist. 1845, p. 12°. 
Hab. E. Mextco: Mexico, without nearer indication of locality (Hegewisch °°). 
Also occurs in Cuba (Pfeiffer 3-5) and Jamaica (C. B. Adams), and on the Florida 
Keys ®7. | 
The Mexican specimens are stated by Pfeiffer? to be somewhat smaller than 
the Cuban ones. 
2. Truncatella bairdiana. 
Truncatella bairdiana, C. B. Adams, Ann. Lyc. Nat. Hist. N. York, v. p. 437 (1852); Carpenter, 
Report Moll. W. Coast of N. Am. p. 275 (1857)?; Moll. of W. N. America, pp. 154, 194 
(1872) *; Pfeiffer, Monogr. Auric. p. 187 *. 
