LYSIANASSIDES. 
71 
AMPIIIPODA. 
NATATORIA. 
LYSIANASSIDES. 
Subfamily— LYSIANASSIDES. 
Superior antennae very short, with the base dilated and 
suddenly tapering. Coxae of the four anterior pairs of 
appendages very deep, the fourth not broader than the 
preceding. One pair of gnathopoda very slender, and 
imperfectly developed. 
In this subfamily the animals may readily be distin- 
guished by their general form. They are not much 
compressed, but the anterior coxae are deep enough to 
hide the limbs attached to them. The superior antennae 
are always very short and pyriform, the shortness com- 
monly resulting from the second and third joints of the 
peduncle being almost rudimentary, while the flagellum 
is seldom longer than the peduncle. The first or second 
pair of limbs are generally short and strong, whilst the 
other is slender and feeble. In some genera it is the 
first, whilst in others it is the second, which is strong. 
We therefore propose to divide them into — 
a . Those genera which have the first pair of limbs 
robust, and the second pair feeble. 
b. Those that have the first pair of limbs slender, 
and the second strong. 
