THE COMMON MARINE SHELLS OF THE BOMBAY SHORE, 220 
Plewrotoma athinsonei (Smith), crenularis (am.).—Very common ; 
whitish, rough, with strong tubercles in the centre of each whorl, 
almost forming longitudinal ridges ; spirally striated. Young shells 
often have a brown or grey tinge. Length, 14” to 2". 
Pleurotoma amicta (Smith,) eincta (Lam.).—A white or dirty white 
chalky-looking shell with an even spire and regular spiral ridges ; 
length, 12” to 2”, 
MURICIDA. 
Murex adustus (Lam.).—A black, rather large shell, with large frill- 
like varices, which get quickly worn down in the dead shell. Each 
whorl has three of these varices running down the shell and raised 
humps between them ; mouth, small, oval ; canal produced and almost 
covered over ; general shape fusiform. 
BUCCINID A. 
This family and the last are very closely connected, and there are 
many sub-divisions, which are not always placed under the same head 
by Conchological authorities. Any general or leading description of 
these shells is impossible. 
The following are common shells on our sandy shores :— 
Dipsaccus or Eburna spirata (uam.) (the ivory shell).—It has a 
thick rough epidermis, beneath which the shell is quite smooth ; colour, 
yellow with large blotches, and zigzag streaks of white or vice versa ; 
whorls 7 to 8; upper edge sharp and sloping inwards, forming a sort 
of spiral gutter; mouth porcellanous ; shape ovate ; spire rapidly 
diminishing. 
Nassa nodifera (Powis) and Nassa ornata (Kiener).—Both these 
shells are polished and somewhat similar in shape, but the former is 
much larger. It is of a grey-green or yellowish hue, with an indistinct 
white band running round the last whorl ; whorls about 8, longitudi- 
nally ridged and slightly noduled at the upper part; mouth rather 
broad at the base and sinus large; length, 14”; breadth, 2", 
NV. ornata is purple-brown with a very distinct white band round the 
last whorl ; base also whitish ; longitudinal ridges stronger and shell 
shorter and stouter ; length, 2” ; breadth, 4", 
Cyllene fuscata (A. Ad.).—A beautiful little shell about 3" long, thick, 
spire sharply pointed and beaded ; last whorl enveloping greater 
