1865.] DR. L. PFEIFFER ON FORMOSAN LAND-SHELLS. 829 
bilicum mediocrem subito ascendens, antice vir descendens ; 
apertura diagonalis, rotundato-lunaris ; perist. tenue, margi- 
nibus convergentibus, supero breviter expanso, basali arcuato, 
reflexo, columellari dilatato, patente. 
Diam. maj. 15, min. 13, alt. 8 mill. 
4, Hevrx swinuoet, Pfr. (Pl. XLVI. fig. 6). TT. mediocriter um- 
bilicata, turbinato-depressa, solidula, oblique ruguloso-striata 
striisque spiralibus confertissimis subtiliter sculpta, unde sub- 
sericea, fulvo-fusca, submarmorata ; spira breviter turbinata, 
obtusula ; anfr. 5-54, superi planiusculi, ultimus vie descendens, 
superne subtumidus, medio carina prominente obtusa cinctus, 
subtus inflatus ; apertura diagonalis, rotundato-lunaris, intus 
cerulescenti-margaritacea; perist, carneo-fuscum, marginibus 
convergentibus, callo tenui junctis, supero anguste expanso, ba- 
sali reflexiusculo, versus insertionem sensim dilatato. 
Diam. maj. 52-58, min. 43-48, alt. 27-28 mill. 
B. Minor, fulva, peristomate pallide roseo, apertura intus alba. 
Diam. maj. 46, min. 39, alt. 25 mill. 
5. Hexrx rormosensis, Pfr. (Pl. XLVI. fig. 7). TT. sinistralis, 
umbilicata, subturbinato-depressa, tenuiuscula, oblique subtili- 
ter striata, sub epidermide tenuissima cerea albida ; spira brevi- 
ter turbinata, vertice obtuso ; anfr. 54, regulariter accrescentes, 
parum convexi, ultimus peripheria obsolete unifasciatus et sub- 
angulatus, antice vir descendens, subtus convexus, striis spira- 
libus minutissimis sculptus, circa umbilicum mediocrem pro- 
fundum non compressus; apertura diagonalis, late lunaris ; 
perist. subincrassatum, marginibus remotis, supero sinuato, ex- 
pansiusculo, basali reflewo, ad insertionem dilatato. 
Diam. maj. 26, min. 223, alt. 12-13 mill. 
6. Herx-sacca, Pfr. (Pl. XLVI. fig. 8). 1. umbilicata, globoso- 
depressa, solida, levissime striatula, albo-lutescens, fasciis 3 
castaneis ( peripherica latiore) ornata; spira breviter turbinata, 
vertice subtili, carneo ; anfr. 54, modice converi, ultimus non 
descendens, basi subinflatus, striis spiralibus obsoletissimis 
sculptus, circa umbilicum angustissimum impressus ; apertura 
parum obliqua, lunaris, intus alba, fasciis pellucentibus ; perist. 
album, undique breviter reflecum, marginibus remotis, basali 
ad insertionem dilatato, subangulato. 
Diam. maj. 234, min. 203, alt. 14 mill. 
7. Hetix MELLEA, Pfr. (Pl. XLVI. fig. 4). TT. wmbilicata, de- 
pressa, carinata, tenuiuscula, sub lente minutissime granulata, 
oleoso micans, pallide fulva; spira parum elevata, vertice obtuso ; 
anfr. fere 5, planiuscult, regulariter accrescentes, ultimus antice 
via descendens, infra carinam acutiusculam subinflatus ; umbi- 
licus mediocris, profundus ; apertura parum obliqua, subangu- 
lato-lunarts ; perist. albidum, marginibus vir convergentibus, 
