88 GASTEROPODA. HELICIDZ. 
faintly striated, excepting on its last whorl. The Provost has 
a similar shell in his possession, which was taken by himself; 
but as the aperture is still in an infant state, I must refrain from 
venturing any opinion as to its specific distinctions. 
STIRPS VIII. 
Genus 37. AZECA. 
Testa acuminato-turrita ; ad apicem subobtusiuscula. Aper- 
tura ovata, ad dextram posticé valdé acuminata. Peritrema 
crassum, acuminatum, integrum. Umbzlicus nullus. Tenta- 
cula superiora mediocria, ad apicem superné paululum dilatata ; 
inferiora breviuscula. 
Shell acuminately-turrited, its apex rather obtuse. Aperture 
ovate, its left side posteriorly very much acuminated. Peri- 
treme thick, acuminate, entire. Umbilicus none. Upper ten- 
tacula moderate, slightly dilated at the upper aspect of their 
extremities. Under ones short. 
Azeca Martoni. Tab. 8. figs. 7, 8. 
A. testa glaberrima, pellucida, nitente, cornea, anfractibus 
planis, peritremate dentibus duobus obtusis : sinistro majore, 
apertura supra peritrema posticé lamellis tribus: media lon- 
gissima. 
Turbo tridens, Pult. Cat. Dorset.46; Mont. Test. Brit. 338 ; 
M. & R. Trans. Linn. Soc. vii. 181; Turt. Conch. Dict. 
219; Dill. Desc. Cat. 877? 
Animal nigricante-cmereum ; dorsum et tentacula nigricantia, 
aut atro-nigricantia. Tentacula superiora subtus, inferiora 
ad apicem, hyalina, aut subpellucida. Variat pede obscu- 
rissimé nigricante. 
Habitat ad aditum sylve Amersham, rarior. 
Shell very smooth, pellucid, glossy, horny ; the whorls flat- 
tened. Peritreme with two obtuse teeth, the left one largest. 
The aperture above the peritreme behind, with three lamelle ; 
the middle one longest. Height one-quarter of an inch. 
