510 
MR. H. N. RIDLEY ON THE 
cimeus which they characterize ; yet having hut one example 
from each locality, I am unable to determine the constancy of 
the differences presented, and must consequently leave the decision 
of the question as to the specific identity or distinction of the 
two to those whom either the possession of a long series of 
forms or a more perfect acquaintance with this group of Crus- 
tacea places in a better position to judge than myself. 
I am not aware that this species, or at all events any closely 
allied form, has before this been recorded from the eastern coast 
of America. Stimpson obtained it from Cape St. Lucas and M. 
Alphonse Milne-Edwards has described it from the Bay of 
Panama. 
Mtthrax (Mitiiraculus) coronatus ( Herbst ). 
1782. Cancer coronatus, Herbst, Naturg. der Krabben, i. p. 184, pi. xi. 
fig. 63. 
1881. Mithraculus coronatus, A. Milne-Edwards, Miss. Sci. Mex. 
( Crustacea ), p. 106, pi. xx. fig. 1. 
Eight males and seven females (three with ova) were taken. 
This species occurs on the coasts of Brazil, Central America, 
and of the West-Indian Islands. Its presence in Fernando No- 
ronha has been previously mentioned by Mr. E. J. Miers, two 
small specimens having been obtained from that island during 
the voyage of H.M.S. ‘ Challenger.’ 
CANCEOIDEA. 
Family Cancridas. 
Genus Carpilius {Leach, MS.), Desmarest. 
1825. Carpilius, Desmarest, Consid. gen. sur la classe des Crust., foot- 
note, p. 104. 
1834. Carpilius, Milne-Edwards (pt.), Hist. Nat. Crust, i. p. 380. 
1865. Carpilius, A. Milne-Edwards (pt.), Nouv. Arch. Mus. Hist. Nat. 
i. p. 212. 
1886. Carpilius, E. J. Miers, Brachyura of H.M.S. ‘ Challenger ,’ 
no. * 
Carpilius corallinus {Herbst). 
1782. Cancer corallinus, Herbst, Naturg. der Krabben, i. p. 133, pi. v. 
fig. 40. 
1865. Carpilius corallinus, A. Milne-Edwards, Nouv. Arch. Mus. Hist. 
Nat. i. p. 216. 
Three specimens, two males and one female. 
