120 MR. SOWERBY, JUN., ON NEW SPECIES OF SHELLS, [Jan. 17, 
6, sloping, scarcely convex ; nucleus smooth ; last whorl somewhat 
swollen, contracted towards the base. Aperture oblong, dark brown 
within. Lip with a moderate sinus above, denticulated within. 
Canal very short. Columella with a nodulous callosity above. 
Length 4, width 2 millim. 
Hab. Florida, on Ostrea virginica (Melvill). 
Mr. Melvill found specimens of this shell as noted above in 1872, 
and in 1879 gave the species the above name in manuscript in his 
collection; but the shell has not I believe been hitherto described. It 
is allied to C. nigricans, but smaller and quite different. 
FIsSURELLA MELVILLI, sp. nov. (Plate V. fig. 11.) 
Shell oval, rather elevated, broad behind, slightly contracted in 
front; radiately closely ribbed, ribs very little raised, alternately 
larger ; concentrically wrinkled; pale green, interior greyish white. 
Orifice round, subcentral. Margin slightly irregularly wrinkled. 
Length 50, width 40, height 22 millim. 
Differing from its congeners chiefly in the rotundity of its orifice. 
PECTEN SIBYLL&, sp. nov. (Plate V. fig. 12.) 
Shell thin, suborbicular, acutely elevated at the umbones, equi- 
lateral, equivalve. Colour light orange, concentrically faintly banded 
with darker orange. Upper valve slightly convex, lower somewhat 
flatter ; both valves very finely and closely ribbed, ribs very delicately 
serrated. Right auricle narrow, extending to about a quarter of the 
length of the shell from umbo to margin; left auricle moderately 
broad. Alt. 58, lat. 56 millim. 
A very beautiful species with delicate sculpture ; the ribs are very 
numerous and close-set, varying slightly and promiscuously in size, 
not regularly alternating as in some species. The delicate close-set 
scales cover the whole of the ribs. 
The specimen passed from the collection of the late Thomas Lombe 
Taylor into that of Mr. Melvill, who gave it the above name in 
manuscript. 
PECTEN LOXOIDES, sp. nov. (Plate V. fig. 13.) 
Shell rather thin, obliquely subovate, inequilateral, white, with 
the upper valve transversely undulately streaked, and spotted with 
pinkish orange. Lower valve rather deep, upper slightly convex. 
Radiating .ribs 20 in number, prominent, rounded, smooth ; inter- 
stices about equal in width to the ribs, also smooth. Auricles 
small, the right rather larger than the left. Alt. 25, lat. 24 millim. 
Hab. Australia. 
The valves of the specimen are odd; there are also odd valves of 
the same species in the British Museum. The species is quite unlike 
any hitherto described, and may be easily recognized by the obliquity 
of its outline. * 
Conus TEXTILE, vai..nvETRIOS. (Plate V. fig. 6.) 
Compared with C. canonicus (Brug.), more pyriform and atten- 
