ZOOLOGY OF FERNANDO NORONHA. 
501 
species of Tomigerus , all of which, however, have a much more 
complicated oral dentition, and are of different form, with the last 
whorl ascending, and. other marks of distinctness. 
In general form and texture of the shell it is not at all unlike 
Pytliia inflata , Pfeiffer ; hut of course has not the expanded lip 
or the same dentition as that genus. 
Two only of the twenty specimens which I have examined 
exhibit any variation in the teeth of the aperture. These want 
the two parietal denticles. 
3. Bulijius (Bulimtjltts) Bidleyi, sp. n. (Plate XXX. fig. 9.) 
Testa parva, ovata, superne acuminata, umbilicata, fusca, ad 
peripheriam luteo-lineata ; anfractus 5-6, convexiusculi, lineis 
incrementi striisque spiralibus tenuissimis sculpti, ultimus antice 
baud descendens ; apertura ovata, intus fusco-carnea, linea pallide 
mediana ornata, longit. totius ^ ad sequans ; peristoma undique 
expansum, carneo-albidum, marginibus callo tenui (interdum 
crasso) superne subtuberculiformi junctis. 
Longit. 12 millim., diam. 6. 
Uab. Living under bark of Mango-trees in the garden and on 
the north side of the island ; also found at the base of the Peak, 
north side, under stones, and on Bat Island. 
I do not know any species sufficiently near this form wherewith 
to offer a comparison. It resembles somewhat in form certain 
species of Partula ; it faintly recalls, chiefly on account of colour, 
Bulimus Jacobi , from the Gfalapagos Islands ; and the spiral 
striation, although finer, somewhat resembles that of some of the 
species of the genus Plecotrema. 
4. Pupa solitaria, sp. n. (Plate XXX. figs. 10, 10 a.) 
Testa minuta, rimata, albida, ovato-cylindracea ; anfractus 5, 
convexi, striis incrementi tenuibus sculpti, sutura vix obliqua 
sejuncti, ultimus pone labfium subvaricosus ; apertura parva, 
quinque-dentata ; dente valido duplici columellari, uno minore 
etiam duplici in pariete aperturali, duobus parvis ab margine 
dextro remotis, quinto minuto basali ; peristoma anguste expan- 
sum, album, marginibus callo tenui junctis. 
Longit. 2j millim., diam. 1|. 
Hab. Platform Island. 
This species is a trifle less cylindrical than P.jjellucida, Pfeiffer, 
a Cuban species ; but has the number of teeth and their arrange- 
ment similar. The columellar tooth, however, is double, the 
