CRUSTACEA. 
137 
Length a little over six-tenths of an inch. 
Brought by Mr. Nuttall from the Sandwich 
Islands. 
Decapoda Macroura. 
Fam. Scittaridce. 
Genus Scillarus, (Fabr.) 
S. latus, (Latr.) Mus. Acad. 
Two specimens, brought from the Sandwich 
Islands by Messrs. Nuttall and Townsend. 
Genus Ibacus, (Leach.) 
I. antarcticus, (Fabr.) Mus. Acad. 
Several specimens, taken with the preceding at 
the Sandwich Islands, by Messrs. Nuttall and 
Townsend. 
Fam. PalinuridcE . 
Genus Palinurus, (Fabr.) 
P. interruptus. Mus. Acad. 
Testa antice spinosa, postice tuberculata; epistoma 7-spi- 
nosa ; fronte bicorni abdominis segmentis interrupts sul- 
catis ; pedibus vittatis. 
Thorax with large spines anteriorly, and large 
flattened tubercles posteriorly, and armed in front 
with two very stout horns, having their apices sub- 
approximate ; epistoma with seven spines, the mid- 
dle one largest ; spaces between the thoracic spines 
and tubercles depressed and hairy ; joints of the 
external antennee covered with large spines ; oph- 
vol. viii. — 1839. IS 
