ZOOLOGY OP FERNANDO NORONHA. 
507 
\ 
DEC APOD A . ' 
MAIOIDEA. 
Family Pebiceridji. 
G-enus Microphrys, M.-Edwards. 
1851. Microphrys, M.-Edwards , Ann. Sci. Nat. Zool. 3, xvi. p. 251. 
1879. Microphrys, Miers, Journ. Linn. Soc. (Zool.) xiv. p. 664. 
1881. Microphrys, A. M.-Edwards, Miss. Sci. Mex. (Crust.) p. 59. 
Microphrys bicorntttus (Latreille). 
1825. Pisa bicornuta, Latreille, Encycl. Meth. Hist. Nat. x. p. 141. 
1872. Microphrys bicornutus, A. M.-Edwards, Nouv. Arch. Mus. Hist. 
Nat. viii. p. 247- 
1881. Microphrys bicornutus, id. Miss. Sci. Mex. (Crust.) p. 61, pi. xiv. 
figs. 2, 3, 4. 
Nine specimens, six males and three females (two with ova). 
This species is common on the coasts of Florida, Mexico, and 
of 'the West-Indian Islands. Occurred under stones and on 
coral-reef. 
Grenus Mithrax (Leach). 
1817. Mithrax (Leach), Latreille, Regne Animal, iii. p. 23. 
1834. Mithrax, Milne-Edwards (in pt.), Hist. Nat. Crust, i.p. 317. 
1879. Mithrax, Miers, Journ. Linn. Soc. (Zool.) xiv. p. 667. 
Mithrax yerrucoshs, M.-Edwards. 
1832-38. Mithrax verrucosus, M.-Edwards, Mag. Zool. vii. pi. 4. 
1881. Mithrax verrucosus, M.-Edwards, Miss. Sci. Mex. p. 102. 
Four specimens, two males and two females (one with ova). 
The largest specimen (a male), with the following measurements 
of carapace, width 42 mm., length 35 mm., differs considerably 
from the others, of which the smallest (the female with ova) gives 
the following measurements of carapace : — width 17 mm., length 
15 mm. In the three small specimens ail the spines are sharper 
and relatively longer, and the carpus of the chelipedes is armed 
above with four or five minute spines in addition to the three 
spines which adorn its anterior (interior) margin. 
Brazil and the West Indies are localities given for this species. 
Under stones at Morro do Chapeo. 
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