REPORT ON THE BRACHYURA. 
43 
Acanthonyx mac-leayii, Krauss. Natal ; Ceylon (Coll. Brit. Mus.). 
Acanthonyx quadridentatus, Krauss. Natal. 
Acanthonyx simplex, Dana. Sandwich Islands. 
Acanthonyx consobrinus, A. Milne Edwards. Reunion. 
Acanthonyx limbcitus, A. Milne Edwards. Reunion. 
Acanthonyx elongatus, White (ined.) Miers. Red Sea . 1 
Acanthonyx lunulatus (Risso). 
Maia lunulcita, Risso, Crust, de Nice, p. 49, pi. i. fig. 4, 1816. 
Acanthonyx lunulatus, Milne Edwards, Hist. Nat. Crust., vol. i. p. 342, pi. xv. figs. 6-8, 1834; 
Atlas in Cuvier, Regne Animal, ed. 2, pi. xxvii. fig. 2. 
Of this common Mediterranean species a single small immature female was obtained 
at St. Vincent, Cape Verde Islands. It approaches the species or variety Acanthonyx 
brevifrons, A. Milne Edwards, in the form of the front, but there are indications of three 
antero -lateral teeth, and the carapace, as in Acanthonyx lunulatus, bears several tufts 
of setse. 
Adult 2. Lines. Millims. 
Length of carapace and rostrum, nearly ..... 3 6 
Breadth of carapace, . . . . . . . 2 4 '5 
Family II. Maiida 
Maiidee, Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. pp. 640, 653, 1879. 
Eyes retractile within the orbits, which are distinctly defined, but often more or less 
incomplete below, or marked with open fissures in their superior and inferior margins. 
Basal antennal joint always more or less enlarged. 
Subfamily 1 . Maiinas. 
Maiinse , Miers, Journ. Linn. Soc. Lond. (Zool.), vol. xiv. p. 653, 1879. 
Carapace usually subtriangulate. Rostrum well developed. Chelipedes (in the male) 
enlarged ; fingers not excavate at the distal extremity. 
The following genera must be added to this subfamily : — 
Sisyphus, A. Milne Edwards (if the orbits in this genus are completely closed it will 
be better placed in the family Periceridse). Chlorinoides, Haswell ; also Scyra, Dana, 
and perhaps Rochinia, A. Milne Edwards, formerly placed in the Periceridse. 
1 Acanthonyx scutellatus, MacLeay, from the Cape of Good Hope, is perhaps a species of Epialtus. 
