No. 399.] MWORTH-AMERICAN INVERTEBRATES. 215 
FAMILY IV. ANTHURID&. 
a. Labium terminating in two rounded lobes. Mandibles with cutting 
edge of two or three blunt teeth, and a semicircular saw in place of 
molar and spine row ; palp three-jointed. First maxillae simple, with 
apical teeth. Maxillipeds with three to six broad, flattened joints. 
6. First five segments of the abdomen coalesced into a single seg- 
ment in the female. 
c. Maxillipeds three-jointed. Flagella of both pairs of anten- 
nz few jointed in female ; of first multi-articulate in male. 
Anthura Leach 
c. Maxillipeds four-jointed. Flagella of both pairs of antennz 
rudimentary, ot the first pair not greatly developed in the 
male. . . . Cyathura Norman and Stebbing 
&. Segments of bibi distinct. Maxillipeds six-jointed. 
Anthelura Norman and Stebbing 
@. Labium terminating in two points, acuminate. Mandibles without 
teeth, lancet-like, lobes at base forming channel. First maxille 
spear-like, distally channeled and serrate. Maxillipeds elongate, 
with four to five joints, the second of which is elongate. Abdomen 
with six segments and caudal segment distinct. Antenna in both 
sexes with many jointed flagella. ^ Calathura Norman and Stebbing 
Genus Anthura Leach. Anthura tenuis (Harger), JV, surface to 19 fms. 
Genus Cyathura Norman and Stebbing 
Cyathura carinata (Krøyer), VM, surface to 1914 fms. (See Fig. 3, p.211.) 
Genus Anthelura Norman and Stebbing. 
Anthelura abyssorum Norman and Stebbing, JV, 1750 fms. 
Genus Calathura Norman and Stebbing. 
Calathura branchiata (Stimpson), W, 20-200 fms. 
FAMILY V. CIROLANID#. 
a. Peduncle of the second antennz five-jointed. Plate of the second joint 
of the maxillipeds furnished with hooks. 
6. Eyes present. Uropoda with the inner angle of the peduncle 
produced. 
c. First and second pairs of pleopoda equal in length, with at 
least the inner branch submembranaceous. 
Cirolana boh 
c. First pair of pleopoda with both branches hard, and form- 
ing a large operculum. Second pair of pleopoda sub- 
membranaceous . . Conilera Leach 
/. Eyes wanting. Uropoda with the inser angle of the peduncle 
not produced. . . . . Cirolanides Benedict 
