828 DR. L. PFEIFFER ON FORMOSAN LAND-SHELLS. [Dec. 12, 
on the thighs; sides of the forehead grey ; sides of neck, outsides of 
the shoulders and fore legs fulvous; crown and nape blackish. 
Hab. Brazil. 
The series of skulls of different species in the British Museum col- 
lection do not present any characters by which they can be divided : 
the adult skulls are almost all of nearly the same size and proportions ; 
they only differ in the form of the impression of the muscles of the 
lower jaw. In some they are separated only by a very thin central 
ridge, extending the whole length of the skull; in others they are 
separated by a broad space of nearly equal width ; but in some others 
the edges of the scars are far apart in front, and close together, with 
a linear ridge, behind, leaving a triangular smooth space on the fore 
part of the crown. But these are doubtless changed by age, though 
there must be a considerable difference in the form of the muscles of 
the last group and those of the two former ones. 
15. DescripTIONS OF THIRTEEN New SPECIES OF LanbD-SHELLS 
rRoM Formosa, IN THE COLLECTION OF THE LATE Hueu 
Cumrine, cottecrep By Mr. Roserr SwinHoer, VICE- 
Consux or THAT IsLanp. By Dr. Louis PFEIFFER. 
(Plate XLVI.) 
_— 
. Herix vesta, Pfr. (Pl. XLVI. fig. 9). 7. subobtecte perfo- 
rata, depressa, tenuis, levigata, nitidissima, pellucida, virenti- 
cornea; spira subconoidea, vertice minuto, papillari; sutura 
marginata; anfr. 53, convexiusculi, regulariter accrescentes, 
ultimus rotundato-depressus, antice non descendens, basi medio 
impressus, perforatione callo subclausa; apertura obliqua, 
dilatato-lunaris; perist. simplex, marginibus subconvergentibus, 
columellari arcuatim ascendente, ad insertionem reflexiusculo. 
Diam. maj. 154, min. 13, alt. 72 mill. 
2. Hexrx sHEeRMANI, Pfr. (Pl. XLVI. fig. 5). TT. wmbilicata, 
lentiformis, carinata, solidula, oblique striata et sub lente sub- 
granulata, rufo-fusca ; spira conoideo-convexa, vertice minuto, 
subpapillari, pallido; sutura marginata; anfr. 7, lente ac- 
erescentes, planiusculi, ultimus non descendens, acute carinatus, 
subtus convexior ; umbilicus latiusculus ; apertura fere diago- 
nalis, securiformis; perist. simplex, marginibus vix conver- 
gentibus, basali arcuato, ad insertionem non dilatato. 
Diam. maj. 18, min. 163, alt. 8 mill. 
3. Heurx cranti, Pfr. (Pl. XLVI. fig. 10). 7. wmbilicata, 
turbinata, tenuiuscula, striatula, sub lente fortiore minutissime 
decussatula, parum nitens, fusco-cornea ; spira subregulariter 
conica, vertice subtili; anfr. 63, convexiusculi, ultimus infra 
carinam acutam, marginem fere attingentem conveaior, in um- 
