142 
Contributions to Indian Malacology. 
[No. 2, 
8. Alyc^eus Theobaldi, n . s . 
Testa aperte umbilicata, conoideo-depressa, corneo-albida, translu- 
cens, costulis elevatis, sinuatis, remotis ornata, inter costulas stiia- 
tula. Spira depresso-conica, apice obtusula, sutura impressa. An- 
fraetus 31 convexi, ultimus ad latus mediocriter tumidus, ibidem con- 
fertissime costulatus. Spatium constrict am longum, striatulum, 
medio tumidum. Tubulam suturale mediocre, \ periphery subse- 
quans. Apertura obliqua, expandens, circularis ; peristoma ad anfrac- 
tum penultimum breviter interrupt um, marginibus callo junctis, du¬ 
plex ; externo expansulo, interno breviter porrecto. Operc : corneum, 
multispirum, externe perconcavum, nucleo centrali interno promi- 
nente papillari. 
mm. 
inch 
Diam, maj. 
4 
or 0.16 
Do. min. 
CO 
0.13 
Alt. 
2a 
0.1 
Ap. diam. 
U 
0.05 
Hab. cum A. liebeti in montibus Khasi, teste W. Theobald, Jun. 
I received two specimens of this species from Mr. Theobald as 
A. hebes , Bens, of which they were supposed to be young shells. 
They, however, prove, on closer examination, to be fully grown and 
distinct, the slight swelling in the centre of the constriction con¬ 
trasting strongly with the high recurved ridge in A. hebes. This 
alone would shew the present to be a different species, but it is also 
distinguished by its lower spire, narrower umbilicus, smaller size, and 
thinner and interrupted peristome, the last character not occurring 
in any other species of the genus. The well-marked distant costu- 
lation of the upper whorls of A „ Theobaldi is entirely wanting in A. 
hebes. The operculum of the latter does not appear to have been 
described. A single specimen in my possession is dark horny, indis¬ 
tinctly multispiral, extremely concave in front, and convex, almost 
conical, behind, and deficient in the central internal boss so promi¬ 
nent in most Alyecei, 
Although there is a swelling in the centre of the constriction in 
A. Theobaldi , it does not amount to a marked ridge, such as charac¬ 
terizes the typical forms of the section Charax of Mr. Benson, e. g. 
A. sty lifer, B. It is consequently not clear whether this species 
should be classed with the members of that section, or with those of 
