CRUSTACEA. 
87 
Section ASTACINI, Latr. 
Genus GRIMOTEA. Leach, Diet, des Sciences Nat. 18. p. 50. 
17. Grimotea gregaria. Leach . Fig. Zoologie de la Coquille, Atlas, Cruslaces, 
pi. 3. fig. 1. 
Galathea gregaria. Fabr. 
“ They were seen in great numbers floating past the ship during a calm, off St, Francisco, 
Dec. 1 .’' — Note by Mr. Lay. 
Genus PORCELLANA, Latr. 
18. PORCELLANA COCCINEA. 11. S. 
Por. coccinea, chelis cequalibus, ulnis interne uni-dentatis , carpis quadri-dentatis , manibus supra carinatis. 
Long, clypei, lin. 11; lat. lin. 9. 
The carapace is rugose, grooved at the sides, and along the posterior margin ; with transverse 
lines anteriorly, and oblique lines over the branchial regions: the rostrum is advanced, pointed, 
grooved along the centre, and uni-dentate at the sides. The clielce are equal, large, compressed, 
slightly scabrous superiorly, smooth beneath ; the cubitus on its inner aspect has a single tooth, the 
carpus four ; the form of the manus when closed is lanceolate ; above it is carinate ; the outer margin 
is slightly and irregularly serrate ; the digits are unarmed, are bent at their extremities, and close 
without intervening space. The femora of the second, third, and fourth pairs of claws are compressed, 
with the superior margin spinous and ciliate ; the other joints are rounded, the last very short, and 
terminated by a simple curved claw. The coxa of the third pair are perforated, the specimen being 
a female. 
The external antenna are as long as the clielce ; the first joint has a triangular plate internally, the 
second joint has a spine internally at the base, the last joint is setaceous. The internal antenna have 
a spine externally at their base. The flagrum of the foot-palpe is simple, styliform, not extending 
beyond the middle of the third joint of the latter. 
This species is a native of the Low Islands of the Pacific Ocean. 
Plate XXVI. Fig. 1. Porcellana coccinea. {dorsal aspect.) 
1 a. Pedipalpus externus. 
1 b. Cauda feeminee. 
2. Porcellana coccinea, fcemina. (ventral aspect.) 
Genus CRANGON, Leach, Malacostr. Brit. 
19. Crangon vulgaris. Fair., Ent. Syst . Suppl. p. 410. Leach, Malac. Pod . 
Brit. tab. 27. B. 
Specimens were taken at Monterey, California, which differ in no other respect from our common 
species, than in having the middle lamella of the tail a little more narrow and pointed. 
20. Crangon Boreas. Fabr., Suppl. Ent. p. 409. 
Cancer Boreas. Phipps, Voyage, p. 190. tab. 12. jig. 1. 
Crangon Boreas. Sabine, Zool. App. to Parry's Voyage, p. 235. 
