Hab. Torres Straits, Sir C. Hardy's Island. Type. B.M. 



Tlie true position of the genus Gymopolia is very doubt- 

 ful. M. Milue-Edwd., in tlie Hist. Nat. Crust., considered 

 it as intermediate between the Dori])pidae and Crrapsidac, 

 l)ut the square buccal opening (which however is im- 

 perfectly closed in front) is very different from that of the 

 O.rAj^toviata, to which the Borippidae belong. It has a great 

 e.xternal resemblance to the Grapsidce, and, I think, should 

 constitute a distinct group among the Anomoura Grapsidica 

 in Dana's arrangement, although the articulation of the 

 fourth joint of the outer maxiUipeds is Maioid and not 

 Gmpsoid in character, as De Haan has shown (Faun. 

 Japou., p. 113) on which account Dana placed the genus 

 with the Dromictdae among the Anomoura Maioidea, but 

 he had not seen any specimens. 



Degapoda Macrouea. 



Sub-tribe Thalassinidea, Dana. 

 U.S. Explor. Expal. XIII., Crust. I., p. 500 (1852). 



Genus Gebia, Leach. 

 Malac. Pod. Brit, tab. XXXI (1815). 



Gebia hirtifrons. Tab. 3, Jir/. 5, 5a. 



Gebia hirtifrons, White, Proc. Zool. Soc, p. 122 (1847) : 

 List Crust. Brit. Mus., p. 71 (1847) ; A. and M. N. H. (scr. 

 2) l.,p. 225 (1848). 



Hab. South Seas. 



Sub-tribe Astacidea, Dana. 

 U.S. Explor. Expcd. XIII., Crust. I., p. 501 (1852). 



Genus Paranephrops, White. 

 Graij, Zool. Misccll. II., p. 79 (1842). 



Paranephrops planifkons. Tab. 2>,fig. 1. 



Paranephrops planifrons. White, Gray, Zool. Misccll. 

 II., p. 79 (1842) ; Bieffenb., New Zeal. II.', ^). 267 (1843) ; 

 List Crust. Brit. Mus., p. 72 (1847). 



Paranephrops teuuicornis, Bana, U.S. Explor. Expcd. 

 XIII., Crust. I., p. 527, pi. 33,/. 4 (1852). 



Hab. New Zealand. Type. B.M. 



There is a specimen named P. tcnuicornis in the British 

 Museum, from New Zealand, presented by the Smithsonian 

 Institution, "Washington, which appears to have been 

 wrongly determined, for the rostrum is three-toothed on 

 each side as in P. planifrons, whereas P. tcnuicornis is 

 described and figured by Dana as having four teeth on 

 each side of the rostrum. 



I have no doubt, however, that P. tenuicornis is identical 

 with P. planifrons, or at most only a variety of it, for the 

 number of teeth on the sides of the rostrum is liable to 

 variation in the latter species, there being sometimes three 

 ou one side and four on the other, in the same specimen. 



Paranephrops zelandicus. 



Astacus Zealandicus, Wliite, Proc. Zool. Soc, p. 123 

 (1847) ; List Crust. Brit. Mus., p. 72 (1847) ; A. and M. 

 N. H. {scr. 2) I., p. 223 (1848) ; Zool. Erebus and Terror, 

 tab. 2,/. 2 (1874). 



Hab. New Zealand. Type. B.M. 



This species must be referred to Paranephrops. The 

 antennary scales are not so much developed and the arms 

 are not so elongated as in P. p)lanifrons, but the hands are 

 covered with spines, like those of the other species of the 

 genus, and are very different from the smooth hands of 

 Potamobius (Astacus), all the species of which inhabit the 

 northern hemisphere. Moreover the supplementary ab- 

 dominal legs which are characteristic of the males of 

 Potamobius and some other genera, are absent in this, as 

 well as in the other species of Paro.nephrops, in the British 

 Museum. 



Sub-tribe Caridea, Dana. 

 U.S. Explor. Exped. XIIL, Crust. l.,p. 501 (1852). 



Genus Alope, Wliite. 



Proc. Zool. Soc, p. 123 (1847) ; List Crmt. Brit. Mus., p. 



75 (1847) ; A. and M. N. H. (ser. 2) I., p. 225 (1848). 



Alope palpaiis. Tc(h. 4:, fig. 1. 



Alope palpaiis, White, Proc Zool. Soc, p. 124 (1847) ; 

 List Cr%ist. Brit. Mus., p. 75 (1847) ; A. and M. JV. H. 

 {scr. 2) I.,^. 226 (1848). 



Hab. New Zealand. Type. B.M. 



Alpheus, Fabricius. 

 Ent. Syst. Suppl, p. 404 (1798) ; Mibic-Echcd. Hist. Nat. 

 Cr2ist. ll.,p. 349 {jKirt) ; Bana, U.S. Explor. Exped. XIIL, 

 Crust. I., p. 534. 



* Beak linear, rising from front margin of carapace. 

 (Inferior margin of larger hand notched at base of finger. 

 Orbits over eyes entire. Fingers of smaller hand not 

 longer than the hand itself) 



Alpheus edwardsil 



Alplieus Neptunus, White, List Crust. Brit. Mus., p. 74 

 (1847) ; Zool. Erebus and Terror, tab. 4,f. 3 (1874). 



Athanasus Edwardsii, Aud&uin, in Savigny Beser. de 

 I'Egypfe, pi. 10, f. 1 ; not Alpheus Edwardsii, Milne-Edwd., 

 Hist. Nat. Crust. II., ^. 352 ; Bana, U.S. Explor. Exped. 

 XIIL, Crust. I., p. 542, p. 34, / 2. _ 



Carapace more inflated than in Alpheus strenuus. 

 Hand larger, similar to that of A. strenuus, but the 

 fingers are narrower compared with the palm. The first 

 joint of the carpus of the second pair of legs is longer than 

 the second, the second joint longer than either the third or 

 fourth and about as long as the fifth joint. The smaller 

 hand is wanting. 



The Alpheus Neptunus described by Dana, U.S. Explor. 

 Exped. XIIL Crust. I., p. 553, pi. 35, f 5, has a three- 



