110 
CRUSTACEA. 
E. productus. Mus. Acad. 
Testa elongata, subquadrata, indistincte maculata; mar- 
gineutrinqufe pone oculos tridentata; rostro profunde bifido, 
utrinque unidentato. 
Carapax elongate, subquadrate, fuscous, with 
some obscure spots ; rostrum dilated at base, flat- 
tened above and divided by a broad notch; on each 
side, the base is produced into a great tooth, direct- 
ed anteriorly ; marginal teeth of the carapax, three 
on each side, including the small post-orbitar one. 
The middle tooth is so great that its base occupies 
nearly the whole anterior side of the carapax, and 
is so straight on its outer edge that it forms almost 
a right angle with the anterior margin ; posterior 
tooth stout, growing from the middle of the margin 
Length of carapax, inclusive of the rostrum, 
about 1 i, inches. 
A single female, brought by Mr. Nuttall from 
Upper California. The specimen not being alive 
when discovered, had, perhaps, undergone some 
alteration in color. 
This species has a great resemblance to the Epi- 
altus marginatus, (young,) figured by Mr. Bell in 
the Transactions of the Zoological Society of Lon- 
don, but may be particularly distinguished by the 
position of the anterior lateral tooth of the carapax, 
which, in that species, is not placed immediately 
behind the eye, but in the middle of the curve of 
the anterior margin ; moreover the anterior angles 
are not so much expanded as in the present species. 
