194 TRUNCATELLA. 
Truncaltella modesta C. B. A4dams in Aun. Lyc. New-York V. p. 48.*) 
-— — . €. B. Adams Contrib. to Conch Nr. 8. p. 132. 
Habitat in insula Jamaica. 
236 18. Tr. Adamesi Pfr. 
T. vix rimata, solidula, cylindracea, nitida, cornea, costis 
obtusis longitudinalibus, subdistantibus (strüsque intercurren- 
tibus exilissimis) sculpta; anfr. superst. 4 convexiusculi, ultimus 
basi suberistatus; apertura verticalis, oblique ovalis; perist. 
incrassatum, subduplicatum, limbo externo breviter patente. — 
Long. 4!/, diam. 2 mill Ap. oblique 1!/ mill longa. (Mus. 
Cuming.) 
Truncatella. scalariformis C. B. .4dams in Proc. Bost. Soc. 1845. 
p. 19.**) Nec Reeve. 
— Adamsi Pfr. in Zeitschr. f. Malak. 1846. p. 189. 
— — €. B. Adams Contr. to Conch. Nr, l. p. 16. 
NX:195 p231827 
— — . Jay Catal. 1850. p. 252. n. 5765. 
— — Kuüst Mon. p. 16. n. 15. 
— — . H. et A4. Adams Gen. rec, Moll. II. p. 311. 
Habitat in insula. Jamaica. 
* * 
* 
237 19. "Tr. sealaris (Risson) Michaud. 
T. imperforata, cylindraceo-oblonga, truncata, solidissima, 
costis validis, obtusis, subrectis, distantibus munita, opaca, 
fusculo-carnea; sutura profunda; anfr. superst. 31/,—4 convexi, 
sensim accrescentes, ultimus brevis, basi subcompressus; aper- 
tura verticalis, parvula, semiovalis, superne subangulata; perist. 
continuum , incrassatum , margine columellari adnato, calloso. 
— Long. 5, diam. 2 mill. Ap. 1?/ mill. longa. (Coll. Nr. 17.) 
Rissoa scalaris Mich. Descr. de plus. nouv, esp. du genre Rissoa p. 21 ***). 
t. Lf. 3I. 9 

*) Shell much elongate, ovate conie: yellowish horn color, with a 
white upper margin of the whorls: with about twenty-one prominent com- 
pressed ribs and numerous spiral striae, which are interrupted by the ribs: 
apex truncate with the loss of — whorls: spire with the outlines somewhat 
curvilinear: whorls remaining after truncation seven, moderately convex, 
margined above: aperture subovate, slightly angulated anteriorly. (C. B. 
Adams l. c.) 
**) T. t. solida, elongata, decollata; anfr. 4 vel 5 reliquis, singulatim 
costis 10 robustis et striis decurrentibus exilissimis — ornatis. -— Div. 209; 
long. post. decoll. 0,16; lat. 0,08 poll. (C. B. Adams 1. c.) 
***) R. testa parva, elongata, subcylindrica, carnea, subperforata, pellu- 
