326 STOASTOMA &. 4. 
convexi, ultimus vix solutus; apertura semicirculo paulo major, 
pone labrum subcontracta; labrum superne abrupte productum, 
carinis vix crenulatum; labium valde solutum, subreflexum ; 
umbilieus latiusculus, lamella spirali mediocri. Opere. pro- 
funde concavum, laevigatum, utrinque dient — Diverg. 
140?; long. 0,045 ; lat. max. 0,086; lat. min. 0,07 poll. (Ad.) 
Stoastoma Tappanianum .4dams in. Aun. Lyc. N-York. V. N. 2. p. 65. 
— -— Adams Contrib. to Conch, N. 8. p. 149. *) 
Habitat in insula Jamaica. 
541 16. $t. Vilkinsoniae Adams. 
T. subdiseoidea, carinis 5 et lineis spiralibus subtilissimis 
(4 — 6 m quovis interstitio) sculpta, pallide cornea, subdia- 
phana; spira modice et convexe elevata; anfr. 3'/, angulati, 
ultimus latiuseulus, antice solutus; apertura campanulata ; 
labrum longe productum, auriculatum, carinis profunde cre- 
natum; labium valde solutum, subreflexum ; umbilicus latius- 
eulus, lamella spirali medioeri. — perc. utrinque auriculatum, 
subtilissime punetulatum. —  Diverg. 140*; long. 0,035; lat. 
max. 0,07; lat. min. 0,055 poll. (Ad.) 
Stoastoma Vilkinsoniae Adams in Ann. Lye. N.-York V. N. 2. p. 64. 
— — Adams. Contrib. to Conchol. N. 8. p. 148. **) 
Habitat in insula. Jamaica. 
542 17. St. Hol!andianum Adams. 7 
T. subdiscoidea, carinis 5 et lineis subtüilissimis spiralibus 
(plerumque 3—6 in quovis intersttio) sculpta, palhide cornea, 
subdiaphana; spira modice et convexe dT antro. 
modice convexi, subangulati, ultimus antice vix solutus; aper- 
tura majuscula, pone labrum leviter constricta; labrum modice 
produetum, carimis vix crenulatum; labium liberum, vix re- 
flexum; umbilicus latiuseulus, lamella spiralhi medioeri. — 
Operc. subauriculatum, laevigatum. —  Diverg. 145?; long. 
0,035; lat. max. 0,065; lat. min. 0,055 poll. (Àd.) 
*5 'This shell resembles S, G'owldianum, and might be mistaken for 
the young of that species. But the labrum 1s thickened as in all mature 
shells of Stoastoma proper. It is most readily distinguished by the peculi- 
arities of the aperture. (Adams l. c.) 
**) 'This shell closely resembles S. Gouldianum, and is most readily 
distinguished by the difference in size. A closer inspection will detect the 
more essential differences. (Adams 1. c.) 
