308 THE AMERICAN NATURALIST.  [Vor. XXXIV. 
FAMILY XXIII. BOPYRIDE. 
a. Elongated appendages attached to the sides of the thorax in the female. 
6. Branchiz affixed to the sides of the abdomen in both sexés. Ab- 
dominal branchiz in the male slender, bcne. ; in the female 
branching . lone Latreille 
&, Branchie affixed to the va of ‘the olid in the female. 
dominal branchiæ wanting in male; in female these appendages 
are simple sacs, not branching . . Cx &Argela Dana 
a’. Thorax in female without elongated dida: 
5. Body of female with one side greatly swollen and much longer than 
other. Segments of thorax only visible dorsally, coxal plates 
only present on shorter side. Abdomen consisting of five seg- 
ments. Only first leg present on larger side, others wholly 
obliterated. Four pairs of pleopoda presni Male with abdomi- 
nal segments fused. Phryxus Rathke 
/. Body of female with ipie: side Goode "Thorsx distinctly seg- 
ment Abdomen consisting of six segments. All the legs 
prescut on both sides. 
s oed in female obsolete, replaced by fleshy ridges. Uropoda 
wa Bopyroides Stimpson 
c. anie in female sini Diodi distinct 
d. Legs of female with an adhesive process (exopod) attached 
to the coxal joint of the legs. This process is papillose 
in the first four pairs, rudimentary in the last three. 
Terminal joint of legs is inflated, without claw. Abdomi- 
nal appendages elongated, coarsely pinnate. 
epon Duvernoy 
d'. Legs of female without exopod. Terminal joint of legs n not 
inflated. Abdominal appendages not pinnate. 
é. Pleopoda well developed, biramous. 
Pseudione Kossmann 
g. Lateral margins of abdominal segments divided by 
marginal furrow into superior and inferior rami; 
inferior rami conical, papilliform ; superior rami con- 
sisting of two equal elongated lamelle. 
Phyllodurus Stimpson 
Genus Ione Latreille. . . . . . . . Jone cornuta Spence Bate, 4 
Genus Argeia Dana. 
a. Head transverse. All the thoracic appendages present. All the 
abdominal appendages present. . . Argeia pugettensis Dana, P 
a’. Head bilobate. Thoracic branchial soap di apparently absent in 
some of the anterior segments. Last three pairs of abdominal appen- 
dapes wanting =- > e oo . . Ama ondas Stimpson, P 
Genus Phryxus Rathke . . . . . Phryxus abdominalis (Krøyer), N 
