CRUSTACEA: 
BY 
RICHARD OWEN, Esq. 
The following - Crustacea were collected during - the voyage of the Blossom 
by Captain Belcher and G. Tradescant Lay, Esq. They are valuable rather 
for the rarity and beauty than for the number of the species, which, indeed, is 
too limited to allow of any general remarks : a descriptive catalogue only is, 
therefore, given. 
The specimens have been presented to and are deposited in the Museums 
of the Royal College of Surgeons and the Zoological Society. 
Class CRUSTACEA. 
Subclass MALACOSTRACA, Latr. 
Legion PODOPIITHALMA, Leach . 
Order DECAPODA, Latr. 
Suborder BRACHYURA, Leach, Latr. 
Section ARCUATA, Latr. 
Genus XANTHO, Leach. 
1. Xantho eudora. 
Xantho carpis interne unidentatis , manibus longitudinaliter sulcatis, clypeo* utrinque obtuse quadridentuto. 
Cancer Eudora. Herbst, Krabben und Krebsen, 3. heft 2. p. 10. taf. 51. fig. 3. 
The carapace of this species is smooth and shining, but is marked with sinuosities and protu- 
berances, of which the principal are in the lateral regions, disposed two on each side; the cardiac 
region has four smaller protuberances. The rostrum is grooved along the middle, and the frontal 
margin is- arcuated. The inferior and inner border of the orbit is produced in the form of a blunt tooth, 
* The crustaceous covering of the Decapoda, taken in connection with its articulated parts for locomotion and 
prehension, differs so much from the shells of the testaceous Mollusca in its mode of attachment, its uses, its density and 
chemical composition, that the term Clypeus (Der Schild of Herbst) is adopted to denote the carapace of the Brachyura, in 
preference to that of Testa , which is used by Latreille. The term Thorax is employed in this memoir to signify the crust 
which protects the heart, stomach, and branchise of the Macroura. 
