4 . 
black spot on each forewing whilst the female has two 
spots. The female lays eggs singly underneath the 
outer leaves of cabbages and other plants, such as 
cauliflowers. Kale, Turnips, radish, horse-radish, 
mustard, and flowering plants like stocks, charlock. 
Shepherd’s-purse, etc. The caterpillar of this 
insect is velvety green with a faint yellow stripe 
down its back, and a row of yellow spots along the 
sides. The surface of the body is dotted with 
tiny black spots. Upon emerging from the egg the 
caterpillar attacks the cabbage or other plant, 
eating the ’’heart", and thus renders the vegetable 
useless for market. 
The most satisfactory method of control is the 
application of arsenical sprays or dustings. Should 
anyone in Tasmania find this insect it ought iio be 
reported at once and the specimen sent to the Agric¬ 
ultural Department or to the Tasmanian Biological 
Survey, The Museum, Hobart. 
We have no v/hite butterflies in Tasmania, so 
that anyone of this colour seen flying about is 
almost certain to be a Cabbage White. 
INTERESTING SHELLS . 
By D. C. Pearse 
The Pan-mussel (Pinna tasmanica). 
is an ovately wedge-shaped bi¬ 
valve with very fragile brownish 
shell. The surface longitudin¬ 
ally ribbed, the interior is 
slightly iridescent and shiny. 
In size it ranges from four to 
twelve inches in length, and 
rarely fourteen inches. Some¬ 
times it is called "Razor Edge" 
on account of its sharp edges. 
Pearls of an ar ber colour are 
occasionally found inside it. 
The animal lives buried in sand 
or mud with its sharp edged pro¬ 
truding out. Owing to their 
fragile nature it is difficult 
to find empty shells that are not 
damaged. Some species of this 
