te 
~ 
241 
equal in size. Two posterior oculars; two temporals, one behind 
the other. The median lower labial is triangular ; six lower labials, 
the first pair forming a suture behind the median shield; two pairs 
of chin-shields, the anterior pair being twice the size of the posterior ; 
there are four pairs of scales between the chin-shields and the first 
ventral. The scales are smooth, rhombic, in fifteen series. Ventral 
shields 172; anal bifid. The posterior quarter of the tail is muti- 
lated. The ground-colour of the upper parts is shining black ; the 
anterior part of the snout, a spot on the fifth upper labial, the rings 
of the body, and all the lower parts, are brownish-yellow. The rings, 
in this specimen, are one-fourth or one-fifth of the width of the 
black interspaces, and occupy two or three transverse series of scales ; 
they are sometimes irregular and interrupted ; all those on the tail 
are interrupted, the halves of one side alternating with those of the 
pen ; the first ring forms a collar, crossed by a narrow black 
streak. 
inches. 
Lanatie ef the head... wicsietennnst ss. = 
of thie tank ‘sy cyictet arent ic oo oe TRE 
— of the tail (restored)............ 4 
10. Description or a New GENUS AND Specirs or Mouuusk. 
By H. Apams, F.L.S. 
Genus Acritia, H. Adams. 
Testa turrita, imperforata; anfractibus numerosis, longitudina- 
liter costatis, ad basin prominente, spirali, ad suturas viz con- 
spicua lira munitis. Apertura ovalis, antice vix producta; pert- 
stomate imperfecto. Columella reflexa. Labrum simplew. 
Shell turreted, imperforate, many-whorled ; whorls longitudinally 
ribbed, the basal portion with a prominent spiral ridge, which is 
slightly visible at the sutures. Aperture oval, a little produced in 
front ; peristome incomplete. Columella reflexed. Outer lip simple. 
This genus, the type of which is Aclis acuminata, H. and A. 
Adams (Scalaria acuminata, Sowerby), appears to belong to the 
family Scalariade. It has somewhat the form of Turbonilla, from 
which, however, it differs in the nucleus not being sinistral. From 
Aelis it may be distinguished by the whorls being longitudinally in- 
stead of transversely ribbed, and from both genera still further by 
the spiral ridge on the lower portion of the whorls. Chemnitzia 
grandis, Ad. and Reeve, is a second species of Acrilla; and I pro- 
ceed to describe a third, from the Collection of Hugh Cuming, Esq., 
which is closely allied to 4. aewminata, but is a much smaller and 
more slender shell, with the longitudinal ribs stronger and further 
apart. 
ACRILLA GRACILIS, H. Adams. 
A, testa tenui, elongata, nitida, albida; anfractibus rotundatis, 
No. 432.—PrRocEEDINGS OF THE ZOOLOGICAL SOCIETY. 
