148 
Islands. In the British Museum is one shell labelled, “8. 
morchi, Angas; Port Jackson, G. F. Angas” ; it is not affirmed 
to be a type; but it quite agrees with Angas’s description. 
The axial and spiral ribs and ridges are of about equal pro-" 
minence, and there is no peripheral rib. There are varices 
at irregular intervals which run downwards and backwards on 
the spire; these are not noted in the definition of the type. 
It recalls the S. suturalis, Hinds; but this has a valid peri- 
pheral rib, which appears as a lira in the suture, and its axial 
coste are more marked, and it is a larger shell, being eight 
lines in length, with ten whorls, instead of five lines with nine 
whorls. Our S. Aust. examples vary very greatly. First the 
peripheral rib is quite valid, and the axial coste end abruptly 
upon it, and the base has only spiral lire. In one this just 
appears in the suture as a lira. In others this rib is less and 
less marked, and may be quite absent. The axial costz also 
differ in yalidity, much surpassing the spiral ridges, or equal- 
ling them, or being less prominent ; they may end at the peri- 
pheral rib, or extend beyond the periphery, and gradually » 
fade out on the base. The spiral ridges may vary in number 
and in size and in the degree to which they modify the axial 
cost. But all have the irregular varices and a minute punc- 
tate surface. 
These considerations suggest the identity of S$. morchi, 
Angas, with S. swtwralis, Hinds. I do not know whether the 
latter has the punctate sculpture, and as it is a much larger 
shell, and comes from a remote region, this is left sub judice. 
Whether S. valida, Verco, and S. invalida, Verco, will also 
come within the specific definition of 8S. morchi, Angas, must 
be left until more material is gathered ; at present intermedi- 
ate forms are wanting. One example of S. morchi supplied 
an operculum, figured on pl. iv., figs. 1, 2, which is similar 
_ to that of S. aculeata, Low., and tends to confirm the generic 
position of this rather atypical Scala. 
Scala invalida, spec. nov. Pl. iv., figs. 9, 10. 3 ae 
Shell rather thin, translucent, Abesingti, imperforate, 11 
whorls. Protoconch deflected, 2 whorls, nearly smooth; the 
first round, the second angulate just above its centre, and 
ending in a varix. Spire whorls 8, regularly convex; suture 
deep, simple. Body-whorl round with the merest peripheral 
angulation, Aperture subrotund, flattened by the base of 
the body-whorl, margin thickened externally. 
Sculpture.—Very crowded, fine axial and spiral lire, 
punctating the whole surface. The axial lirze vary somewhat 
in thickness; they continue over the base and the callus of 
the aperture, so as to reach nearly to its inner margin, leay- 

