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THE VOYAGE OF H.M.S. CHALLENGER. 
obscurely carinatecl ; the front emarginated or subtruncated or quadridentatecl, the hepatic 
regions are usually concave ; the lateral margins are entire or more or less distinctly 
tuberculated or toothed, but the tubercles are very rarely spiniform. The orbits are very 
small, circular, with two or three closed marginal fissures and an interior hiatus ; the 
buccal cavity is not separated from the antennulary fossse by any distinct epistoma, and 
the endostomian ridges are very stongly defined. The post-abdomen in the male is 
narrow and four or five-jointed, with several of the intermediate segments coalescent, and 
it covers the sternum at base, between the bases of the fifth ambulatory legs. Eyes 
very small. Antennulary fossae oblique, or nearly transverse. The antennas are very 
small and their basal joint enters the interior orbital hiatus. The exterior maxillipedes 
cover the whole of the bucca] cavity ; the merus of the endognath, as usual, is triangulate, 
and the exognath has a straight or somewhat curved exterior margin. 
The chelipedes (in the male) are subequal and of moderate length, or more rarely, 
considerably elongated ; with the merus subcylindrical or somewhat trigonous, palm and 
fingers usually compressed. The ambulatory legs are slender and small, with the joints 
usually smooth ; dactyli styliform. 
The species are small and numerous and inhabit the sublittoral or deeper waters both 
of the Atlantic and Indo- Pacific regions. The species of the section Phlyxia, Bell, are, 
as far as at present known, restricted to Australia. 
From the genus Nursia (to which it is nearly allied), Ebalict differs in the less 
produced margins of the carapace, which are not cristated, &c. 
The genera Ebcdia and Phlyxia are now connected by so many intermediate species, 
that not one of the distinctive characters mentioned by Bell can be regarded as constant. 
I propose, therefore, to unite these genera, but to separate the species under two primary 
sections or subgenera (for which the names Ebalia and Phlyxia may conveniently be 
retained) as follows : — 
I. Front slightly concave or truncated, not quaclridentated ( Ebalia I. 2 ) : — 
Ebalia tuberosa (Pennant) = Ebalia insignis, Lucas, jide Heller. European Seas ; 
Adriatic; Mediterranean, to 250 metres (Heller). 
Ebalia tumefacta (Mont j = Ebalia aspera, Costa, Jide Heller. European Seas; 
Mediterranean ; Adriatic. 
Ebalia cranchii (Leach ) = Ebalia discrepans, Costa, and Ebalia deshay esii, Lucas, 
jide Heller. European Seas ; Mediterranean ; Adriatic. This species and 
the preceding are mentioned by Heller to occur in 30 to 40 fathoms. 
Ebalia granulosa, Milne Edwards. Mediterranean, Corfu (Coll. Brit. Mus.), 
Ebalia edwardsii, Costa = Ebcdia algerica, Lucas. Mediterranean. 
1 The synonyms of the Mediterranean species are as given by Dr. Heller, Crust, siidliehen Europa, pp. 124-128, 
1863. 
