272 DR. P. P. CARPENTER ON NEW SPECIES [Mar. 14, 
701. ? VirrINELLA, sp. ind. 
Tablet 2535 contains a fragment, ‘085 across, of what was pro- 
bably a gigantic species of this genus or of Cyclotrema, strongly 
keeled. 
492. DiaALA PAUPERCULA, C. B. Ad. 
= Cingula paupercula, C. B. Ad. Pan. Shells, no. : diagnosi 
mutata. 
=? Odostomia mamillata, Maz. Cat. no. 492: diagnosi aucta. 
D. ¢. nitida, solida; vert. nucl. anfr. iv., lirulis spiralibus et 
radiantibus tenuiter decussato; t. adulta decollata, vertice 
mamillato ; anfr. norm. iv. ; peritremate continuo ; basi obtuse 
angulata, lacuna umbilicali a labio separato formata. 
Long. °085, long. spirze 055, lat. *@5; div. 34°. 
The fortunate discovery of a perfect young specimen and some 
adult shells in the shell-washings of Professor Adams’s collection 
enables us to explain the anomalies described in the Mazatlan Cata- 
logue, where the solitary dead shell was referred, with doubt, to 
Odostomia, in consequence of its truncated apex. It was not pos- 
sible to recognize in it Professor Adams’s “ Cingula,” since that was 
described as having the apex “ subacute,”’ and the angular base and 
continuous peritreme were not mentioned. The nuclear whorls are 
sculptured as in A/aba supralirata ; but the vertex, instead of being 
persistent as in that genus, appears to be always decollated in the 
adult. The shell has the peculiar glossy texture of Diala. 
702. MANGELIA SULCATA, N. sp. 
M. ¢. subturrita, albida, apice obtuso; anfr. vii., tumidioribus ; 
liris vii., obtusis, rectis, vix angulatis ; sulcis spiralibis creber- 
rimis, circa basim continuis; labro? ... | fracto}. 
Long. °2, long. sp. °12, lat. -07 ; div. 35°. 
Hab. Mazatlan; one specimen off Spondylus, on tablet 2538 ; 
Liverpool Collection. 
703. ? Torinta, sp. in. 
Tablet 2539 contains a small shell, -035 across, consisting of 33 
smooth, flattened, sinistral whorls; with a distinct suture, but not 
umbilicated. In a larger specimen (unfortunately lost), under the 
microscope this sinistral vertex appeared turned completely upside 
down, with more than half a whorl of an orbicular shell, white, 
sculptured like Vitrinella, with a very strong peripherical keel, and 
other smaller keels, decussated by radiating ruge. This mode of 
growth is exactly as in the young Torinia ; but the adult must have 
been very distinct from any known species, and perhaps did not 
belong to any described genus. 
550. MucronaLia INVOLUTA, 2. sp. 
M. ¢. parva, tenui, albida, irregulari, marginibus spire valde 
excurvatis ; vertice declivi; anf. norm. vi. +.... satis excur- 
