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THE VOYAGE OF H.M.S. CHALLENGER. 
and compressed, except in Persephona lichtensteinei), and the narrower exognath of the 
exterior maxillipedes, whose exterior margin is straight, not arcuated, and slightly dilated 
at base, as in Myra. The post-abdomen of the male in Persephona punctata (the only 
species in which I have examined it) is five-jointed, with the penultimate, as well as the 
first and second and terminal segments distinct. 
This genus apparently represents Myra on the shores of the American continent and 
islands adjacent. 1 
Persephona punctata (Browne) (PI. XXY. fig. 5). 
Cancer punctatus, Browne, Civil and Nat. Hist, of Jamaica, vol. ii. p. 422, pi. xlii. fig. 3, 
1756. 
„ „ Linne ( partim ), Syst. Nat., ed. xii. p. 1045, 1766. 
Persephona guaia, Bell, Trans. Linn. Soc. Lond., tom. cit., p. 292, 1855. 
„ punctata, Stimpson. Ann. Lyc. Nat. Hist. New York, vol. vii. p. 70, 1860. 
„ „ Kingsley, Proc. Acad. Nat. Sci. Philad., p. 403, 1879, et synonyma. 
Bahia (shallow water), a small male. 
$ . Lines. 
Length of carapace, about . . . . . . 11 
Breadth of carapace, about . . . . . . 10 
The characteristic coloration is in this specimen almost obliterated. 
Myra, Leach. 
Myra, Leach, Zool. Miscell., vol. iii. pp. 19, 23, 1817. 
„ Milne Edwards, Hist. Nat. Crust., vol. ii. p. 125, 1837. 
„ Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, p. 392, 1852. 
„ Bell, Trans. Linn. Soc. Lond. (Zool.), vol. xxi. p. 296, 1855. 
Carapace dorsally very convex, and more or less distinctly granulated, with the 
lateral margins regularly arcuated ; it has three posterior spines or protuberances (the 
median one being more elevated and situated on the posterior margin), and there is 
usually a more or less distinct protuberance upon the pterygostomian regions. The 
front is concave and does not project beyond the anterior margin of the buccal cavity. 
The orbits are very small and circular, with usually three deep marginal fissures, and 
with a rather large inferior hiatus. The post-abdomen (in the male) is usually four- 
jointed, with all of the segments except the first, second, and last, coalescent. Eyes 
very small. Antennules somewhat obliquely plicated. Antennae with a slender basal 
1 Its range may, however, extend over the whole Atlantic region ; since there is a specimen, perhaps not distinct 
from Persephona punctata, from South Africa (Sir A. Smith), in the collection of the British (Natural History) Museum, 
and if the habitat of Herhst’s Cancer mediterraneus be correctly given, this genus must also occur in the Mediterranean 
Sea. I have referred the species from Bass Strait, described by Dr. A. Milne Edwards as Persephona tuberculosa, to 
the genus Malta. 
Millims. 
23-5 
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