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THE VOYAGE OE H.M.S. CHALLENGER. 
structure of the chela, which occurs with more or less distinctness in certain other 
genera ( e.g ., Nursilia, Iphiculus and Callidactylus), is, I think, sufficient to distinguish 
Myrodes from (both) Myra and Persephona. 
From Nursilia and Iphiculus, Myrodes is at once distinguished by a very different 
form of the carapace, which in those genera has not the three posterior tubercles which 
exist in Myrodes. Callidactylus, Stimpson, is less certainly distinguishable from 
Myrodes ; it differs, however, according to Dr. Stimpson, in the absence of an indurated 
ridge from the basal joint of the antennules (which ridge is not very distinctly developed 
in Myrodes ), in the somewhat contorted palms of the chelipedes, and in the character 
of the dactyli of the ambulatory legs. 
The type of this genus, Myrodes eudactylus, occurs in the Indo-Malaysian and 
Australian Seas, and at New Caledonia. 
Myrodes eudactylus, Bell. 
Myra dilatimanus, White, List Crust. Brit. Mus., p. 46, 1847, descrip, nulla. 
Myrodes eudactylus, Bell, Trans. Linn. Soc. Lond., tom. cit., p. 299, pi. xxxii. fig. 6, 1855 ; 
Cat. Leucosiidse in Brit. Mus., p. 13, 1855. 
Myra eudactyla, A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. x. p. 46, pi. iii. fig. 3, 1874. 
„ „ Haswell, Cat. Australian Crust., p. 123, 1884. 
Myrodes gigas, Haswell, Proc. Linn. Soc. N.S.W., vol. iv. p. 52, pi. v. fig. 5, 1880. 
South of New Guinea, 28 fathoms (Station 188) a small, perhaps young, specimen. 
In this example the carapace is somewhat broader in proportion to its length, and the 
lobes of the rostrum less prominent than in the specimens from the Philippines in the 
collection of the British (Natural History) Museum. The dorsal surface is indistinctly 
carinated in the median line, as in two out of three specimens in that collection. 
There is no granulated border on the inner margin of the palm of the chelipede in any 
specimen I have examined of this species, and Bell’s figure is probably in error as 
regards this particular. 
?• 
Lines. 
MilKms. 
Length of carapace, about 
61 
14 
Breadth of carapace, .... 
11-5 
Section III. The carapace is not produced over the bases of the ambulatory legs. 
The palms of the chelipedes are very slender and elongated ; the fingers very slender 
and nearly straight, or with the tips slightly incurved. The pterygostomian channels 
have usually two notches at the distal extremity (Iliinse, Stimpson). 
Genera: — Ilia, Fabricius ; Arcania, Leach ( = Iphis, Leach); Ixa, Leach; 
Iliacantha, Stimpson ; Myropsis, Stimpson ; Callidactylus, Stimpson (this 
genus establishes the transition to the section Myrodinse). 
