510 MR. H. N. BID LEY ON THE 



cimeiis which they characterize ; yet having but 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. 

 Mphonse Milne-Edwards has described it from the Bay of 

 Panama. 



Mtthrax (Mithraculus) coeonatus (Herhsi). 



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 Canceidje. 



Genus Caepilius {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,' 

 p. 110. 



Carpilius coeallinus (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. 



