2 S. I. Smith on Brazilian Crustacea. 



Mithraculm coronatm Stimpson, American Journal Sou, 2d series, vol. xxix, 1 860, 

 p. 132 ; Annals Lye. Nat. Hist, New York, vol. vii, p. 186, 1860. 



Two females of this species were collected by Prof. Hartt at the 

 Keefs of the Abrolhos. They do not differ perceptibly from A spin- 

 wall specimens. 



The two specimens give the following measurement : — 



Length of carapax, 12-8"™ Breadth of carapax, 17-6™"! Ratio, 1 : 1-37 

 " " " 17-2 " '• " 23-4 " 1:1 -36 



The differences pointed out by Stimpson at once distinguish this 

 species from M. sculptus, but White cites the figures of both species 

 under his Ifitkraoulus coronatus, so that it is not possible, without 

 an examination of his specimens, to tell which species he had in view. 



Mithrax hispidus Edwards. 



Cancer hispidus Herbst, op. cit.. Band i, p. 247, Tab. 18, fig. 100, 1782. 

 Mithrax hispidus Edwards, Magasin de Zoologie, 2^ annee, 1832 ; Historie natureUe 

 des Crust., tome i, p. 322, 1834; DeKay, Zoology of New York, Crust., p. 4, 1844; 

 Gibbes, loc. cit., p. 172; Stimpson, American Journal Sci., 2d series, vol. xxix, 

 1860, p. 132; Annals Lye. Nat. Hist., New York, vol. vii, p. 189, 1860. 



Several specimens collected at the Reefs of the Abrolhos agree well 

 with Edwards' and Stimpson's descriptions of this species. The cara- 

 pax is wholly naked above, the elevations anteriorly are smooth and 

 polished, and there are no spines or prominent tubei'cles on the median 

 regions. There are two small tubercles just at the base of the frontal 

 teeth, and two more just behind these on the anterior lobes of the 

 gastric region ; there are also traces of two tubercles on each of the 

 antero-lateral gastric lobes, and several small tuberculiform elevations 

 on the hepatic and branchial regions near the antero-lateral margin. 

 The external angle of the orbit forms an obtuse tooth not projecting 

 so far forward as the external lobe of the inferior margin ; the suc- 

 ceeding tooth of the antero-lateral margin (the second normal) is quite 

 small and obtuse, but the three remaining teetli are spiniform, slender 

 and curved forward ; in addition, there is a very small tooth just be- 

 hind the posterior spine of the antero-lateral margin. 



Several specimens give the following measurements: — 



