LIMNORIA. 349 
ISOPODA. ASELLIDA. 
NORMALIA, 
Genus—LIMNORIA.  (Leach.) 
Generic character. Oblong-ovate, depressed; antenns sub- 
equal, cylindrical, not longer than the cephalon. Pereiopoda 
nearly alike, slender. Pleon six-jointed. Branchial plates naked. 
Terminal segment large, semicircular, with a lateral appendage 
on each side bearing two terminal slender styles. 
Tue small animal which forms the type of this 
genus is oblong, rounded in front and behind, and sub- 
depressed. The head is short and round, with the eyes 
wide apart, composed of but few facets. The antennz 
are of nearly equal length, being scarcely longer than 
the head, and terminated by a bristly pencil of hairs, the 
upper pair composed of three small joints and a small ex- 
articulate flagellum, and the lower pair also composed of 
three joints, with asmall articulated flagellum. The outer 
foot-jaws consist of a long basal joint, closely united to 
the following, the inner apical angle of which is con- 
siderably dilated, produced and setose ; the four following 
joints are also short, with their inner angles similarly pro- 
duced. At the base is attached an elongated triangular 
plate; this plate is developed to its fullest extent in the 
Idoteide. The mandibles are elongated, flattened, horny, 
broadly truncated at the extremity, and furnished with 
a triarticulate palpiform appendage. ‘The first pair of 
maxillz consist of two very delicate elongated plates, the 
inner one being the more slender and curved; both are 
setose at the tip, but the inner has, moreover, a strong 
curved spine at its inner extremity. The second pair of 
