CRUSTACEA. 
89 
slender, extends to the root of the seta of the mesial antenna, has two teeth above, behind the middle 
as many beneath, before the middie; but the chief characteristic of this species, and that which 
distinguishes it from the preceding, which in other respects it closely resembles, is, that the second, 
third and fourth abdominal segments terminate below in three spines, and the first and fifth in two 
spines, whilst the last only is terminated by a single spine, directed backwards. The first joint of the 
superior or mesial antennae has a long spine externally at the base, and a short spine at the same 
aspect of the apex ; the second joint has also a spine externally at the apex, and the third has a spine 
at the apex, but on the upper part. The internal seta extends very little beyond Ihe squama of the 
lateral antenna. The peduncle of the scale of the superior or lateral antenna has two spines externally. 
The terminal seta is as long as the body, and spinous externally throughout its whole length. The 
femora of the third, fourth and fifth pairs of legs are spinous externally, the terminal spine being the 
longest. The last joint of the foot-palpe is hirsute, and spinous at the extremity. The middle lamella 
of the tail has two rows of eight spines each along the superior aspect. 
This species is abundant on the shores of Kamtschatka. 
PLATE XXVII. Fig. 2. Hippolite armata. 
25. Hippolite cornuta. n . s . 
Hip. thoracis carirta dentibus quatuor , margine antico trispinoso, setis antennarum superiorvm elongatis. 
This species presents the singularity of the internal seta of the superior antenna, being produced 
to nearly an equal length with the inferior antenna, but in every other respect adheres closely to the 
generic type ; and I am the less inclined to consider it as other than a specific difference, from observing 
that the individuals of the genus Crangon differ considerably in the length of their antenna, the exterior 
of which in our common species, and some others, surpass the length of the body ; whilst in Boreas 
and Lar they barely reach beyond the thorax. 
In this species of Hippolite, the seta of the external antenna are alternately annulated with red 
and white,* as in Pandalus annulicornis, Leach, and are spinulose along the the inner aspect. The 
abdominal segments terminate interiorly in two spines, of which the posterior is the longest; in every 
other respect the description of the preceding species will apply to this. 
Plate XXVIII. Fig. 2. Hippolite cornuta. 
26. Hippolite palpator. n . s . 
Hip. rostro brevi tenui, thoracis margine antico bispinoso, pedipalpis pralongis. 
Long. corp. 1 unc. 10 tin. Color ruber. 
This species may be easily recognised by the length of the feet-palpes, which extend forward 
beyond the second pair of legs. The second joint is spinous externally, and reaches to the root of the 
seta of the external antenna ; the last joint is subhirsute and spinulose at the extremity. The rostrum 
in the single specimen I have examined had two spines above, and one beneath, near the apex; it 
extended to the penultimate joint of the mesial antenna. Behind the rostrum are four spines along 
the anterior half of the thorax, and there are two spines at the anterior margin, both below the eye ; 
the rest of the thorax is smooth. The mesial antenna do not extend beyond the squama of the 
lateral antenna. These are longer than the body. The abdominal segments are ciliate inferiorly, 
but unarmed, save a small spiue on either side the last segment. Lamella of the tail short and 
broad, the middle one with two rows of four spines each along the superior aspect. 
It is a native of Monterey, California. 
Plate XXVI1X. Fig. 3. Hippolite palpator. 
I suspect this is also the case in the preceding species, but the colour is too far gone to speak with certainty. 
N 
