360 ARCTURIDA. 
ing a distinct genus or subgenus, it will be necessary to 
employ for them another name, in which case that of 
Leacia, proposed in 1825 in honour of Dr.’ Leach, by 
Dr. G. Johnston, must be used instead of Arcturus, a 
step, however, which we by no means considered neces- 
sary and advisable. 
Mr. Goodsir, who carefully studied the animals of 
this group, was not acquainted with the characteristics 
of the male sex in the Arcturt, almost all the speci- 
mens which he procured having eggs in the marsu- 
pium, The eggs are pear-shaped and curved, and have 
a tough external membrane, with a granular white and 
a light yellow mass towards their centre, which may be 
of the nature of yelk globules. The ovaries are two 
elongated white granular bodies on each side and beneath 
the liver: they open at the third segment of the body, at 
the extremity of the marsupium. 
