214 ALICE L. EMBLETON ON A NEW 
For purposes of comparison, bearing on the systematic position 
of Goidelia japonica, it may be as well to give the features 
characteristic of the whole family, as stated by Canu :— 
“Body completely segmented; first thoracic segment joined to the 
cephalic ring; first antenna composed of seven segments, being the same 
in both sexes; second antenna simple, with four joints; mandibles devoid 
of a palp, and without masticatory teeth, but provided distally with 
accessory mobile parts in the shape of a solid bent claw, or rather of fat 
blades with regular denticles and serrations, or of hooks finely fringed ; 
maxillary rudimentary, showing, however, traces of a division into a 
masticatory lobe (internal) and a palp (external); maxillipedes well- 
developed, the first furnish important sexual distinctions; thoracic feet 
biramous, and the rami of three joints in the four anterior pairs, simple 
and flat in the fifth pair.” 
The family is, according to Canu, made up of the three genera 
Hersilia, Hersiliodes, and Giardella; of these, he says, Hersilia 
is commensal more intimately—z.e. more nearly approaches an 
entozoic condition—than the other two genera. The classifi- 
cation is based on the differences in the mouth-parts, special 
significance being attached to the accessory parts at the distal 
end of the mandibles, as is seen by the following table given by 
Canu :— 
“ Table of Genera.—Mandibles bearing at their distal extremity besides 
the recurved claw common to all the family :— 
i. Two accessory pieces. 
1. The anterior is a flat serrated blade, and the posterior is a small 
bearded hook. In the male, the 1st maxillipede is formed or 
two joints, the end being chelate, reduced and toothed. 
Genus Hersilia (Philippi). 
2. Almost the same, with flat, toothed, triangular blades laterally. 
In the male, the Ist maxillipede has two basal joints, and a well- 
developed prehensile end in the form of a long recurved claw. 
Genus Gardella (Canu), 
ii. Three accessory pieces. 
3. The anterior is a subtriangular, tocthed blade, and the others are 
two long bearded flexible hooks. Genus Hersiliodes (Canu).” 
The distinguishing features of the three genera, as given by 
Canu, are as follows :— 
“ Genus Hersilia (Philippi).—Body flattened, composed of very distinct 
segments, male with ten, female with nine (not counting the furce) ; 
first antenna seven-jointed ; second antenna simple, four-jointed ; cutting- 
mandible relatively small, bearing at its distal end three accessory pieces 
