1864.] MR. C. SPENCE BATE ON NEW CRUSTACEANS. 663 
of pereiopoda are nearly as long as the first, but much more slender, 
having the meros and propodos subcarinated. The three posterior 
pairs are shorter. The pleon is small and narrow, the second and 
third segments being the broadest, while the seventh is abruptly nar- 
rower than the sixth, and forms a triangular plate. The female dif- 
fers from the male in being more protuberant over the stomachal 
region, and consequently the rostrum is more depressed ; anteriorly, 
there is less development of the lateral branchial teeth, and there is 
a relatively greater distance between the fifth pair of pereiopoda. 
The pleon is almost circular, and covers the entire surface of the 
ventral region. 
The colour of the animal is of a reddish brown, which increases 
in brightness as it approaches towards the extremity-of the chele. 
In one or two young females the carapace was smooth and glabrous. 
Found in tolerable abundance in Esquimalt and Victoria Harbours, 
and, indeed, in all the sheltered inlets along the mainland coasts from 
the mouth of the Fraser to San Francisco. Dredged in about eight 
fathoms of water, but easily obtained in pools at extremely low tides. 
Its favourite haunt is under a large flat stone, or hid under the sea- 
weed that fringes the margin of a pool. The specimen from which 
the drawing was made was taken in Esquimalt Harbour. 
OREGONIA LONGIMANA, 0D. 8. 
Carapace coarsely granulated or minutely tuberculated, free from 
hairs, except upon the rostrum, which is slender and twice the length 
of the interorbital space. Pleon, in the male, narrow, concave upon 
each side, corresponding with the fourth, fifth, and sixth segments. 
Telson rather broader than the preceding segment, and emarginate at 
the terminal extremity. The first pair of pereiopoda are very long, 
being twice the length of the carapace, and much longer than in either 
of the species described by Dana and Stimpson; the meros reaches 
quite to the extremity of the rostrum, and is furnished with two or 
more longitudinal rows of small granulated tubercles ; the propodos 
is rather longer than the meros, and its breadth is equal to about 
one-third of its length; the dactylos is about one-third the length 
of the propodos, slightly curved and minutely serrated on the inner 
margin, which impinges throughout its entire length upon the pro- 
duced extremity of the propodos. ‘The three succeeding pairs of 
pereiopoda are imperfect in the only specimen procured ; but the last 
pair are long, cylindrical, slender, and terminated in a powerful dac- 
tylos. 
This specimen was obtained in Esquimalt Harbour, and in its 
habits and general distribution it is very similar to the preceding. 
PLATYCARCINUS RECURVIDENS, 0. S. 
This very pretty species may easily be distinguished by the sharp 
points of the inner lateral teeth, granulated or minutely baccated 
along the margin, and having the apex recurved. The intraorbital 
margin is three-lobed and granulated, the central lobe being the 
smallest. ‘The dorsal surface of the carapace is granulated on the 
