290 
THE VOYAGE OF H.M.S. CHALLENGER. 
The unique specimen presents the following dimensions : — 
Adult ?. 
Lines. 
Millims. 
Length of carapace, about . 
■ 23 
49 
Breadth of carapace, . . . . 
23J 
50 
Length of a chelipede, about 
Mi 
52 
Length of first ambulatory leg, 
25i 
54 
It was dredged north of the Admiralty Islands, in 150 fathoms, in lat. 1° 54' 0" S., 
long. 146° 39' 40" E. (Station 219). 
Mursia, Desmarest. 
Mursia, Desmarest, Consid. sur les Crust., p. 108, footnote, 1825. 
„ Latreille, Crust, in Cuvier, Regne Animal, ed. 2, p. 39, 1829. 
„ Milne Edwards, Hist. Nat. Crust., vol. ii. p. 109, 1837. 
,, Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, p. 391, 1852; not Murcia of Leach, 
MSS. 
Thealia, Lucas, Ann. Soc. Entom. France, ser. 1, vol. viii. p. 577, 1839. 
„ Dana, tom. cit., p. 391, 1852. 
Carapace transverse and moderately convex, with the dorsal surface tuberculated, 
some of the tubercles disposed in five longitudinal series ; the antero-lateral margins 
regularly arcuated and terminating in a well-developed lateral epibranchial spine, the 
postero-lateral margins straight, and without any trace of the clypeiform expansions 
characteristic of Calappa. Front small, with a median tubercle or tooth. Orbits with 
usually one or two closed fissures in the superior margin and with a wider hiatus in the 
inferior margin. Subhepatic channels well developed, as in Paracyclois. Post-abdomen 
in the male with two or three of the intermediate segments coalescent ; it covers at 
the base the whole width of the sternum between the coxae of the fifth ambulatory 
legs. The robust eye-peduncles fill or nearly fill the orbital cavities. The an te rm ides 
are somewhat obliquely plicated. The basal antennal joint is rather slender, and 
occupies the interior hiatus of the orbit ; the flagellum is well developed. The exterior 
maxillipedes (as in Calappa ) do not cover the anterior part of the buccal cavity ; the 
ischium of the endognath is not produced at .its antero -internal angle ; the merus is 
obliquely truncated at the distal extremity, and the carpal joint is articulated at the 
antero-external angle of the merus, the exognath is slender and straight: The chelipedes 
and ambulatory legs are nearly as in Calappa, but the chelipedes are much less 
developed, the palm not so deep, and the merus bears one or two distal spines, not a 
dentated crest, on the outer surface, and the ambulatory legs are relatively longer. 
Besides the two species referred to below, Mursia acanthophora (Lucas) = Mursia 
armata , de Haan, is to be included in this genus. This species occurs in China and 
Japan. 
