26 THE VOYAGE OF H.M.S. CHALLENGER. 
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Depth in Fathoms. : Name, Geographical Distribution. 
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Parazetes, Slater (1879). 
Mandibles rudimentary, two-jointed ; palpi nine-jointed ; ovigerous legs ten-jointed ; 
proboscis fusiform. 
(2) Parazetes auchenicus, Slater, Annals and Mag. of Nat. | Off Cape Sima (Japan). 
Hist., 5th series, iii, 281, 1879. Slater calls the generic 
characteristic of Parazetes “distinct.” The description 
of the genus and species has been given from a single 
specimen, so doubt whether the generic differences from 
Zetes or any other closely-allied genus will hold good. 
Pariboea, Philippi (1843). 
Mandibles rudimentary, two-jointed ; palpi five-jointed ; ovigerous legs nine 
_ (nonne ten- (?) ) jointed ; proboscis ovate. 
(?) Pariboea spinipalpis, Philippi, Arch. f. Naturg., 1843, ix. | Sorrento (Gulf of Naples). 
p. 178. Perhaps the description of this species is not 
taken from an adult specimen. 
Alcinous, Costa (1861). 
Mandibles rudimentary, threejointed ; palpi seven- or nine-jointed ; ovigerous legs 
eight-jointed ; proboscis ]ong-ovate. 
(2) Alcinous vulgaris, Costa, Microdoride mediterranea, | Mediterranean. 
Napoli, 1861, p. 13. This species has, I believe, a 
certain resemblance to an Ascorhynchus. 
(?) Alcinous megacephalus, Costa, Microd. medit. Napoli, | Gulf of Naples. 
1861, p. 14. This species belongs rather to Pariboea, 
Philippi, than to Alcinous, Costa. 
Achelia, Hodge (1864). 
Mandibles rudimentary, two-jointed ; palpi eight-jointed ; ovigerous legs 
ten-jointed ; proboscis pyriform. 
Low water| Achelia spinosa, Stimpson (sp.). Zetes spinosa, Stimp- | Grand Manan; Eastport, Casco 
mark to 17 son. Invertebrata of Grand Manan, 1853, p. 37. A. Bay, off Block Island, &e. 
fathoms ; 35 spinosa, Wilson, Pyenogon. of New England, Trans. 
fathoms. Connect. Acad. of Arts and Sciences, vol. v. p. 7, 1880. 
The differences of A. spinosa, Stimpson, from Hodge’s 
A. echinata “seem scarcely sufficient to separate them 
as distinct species” (Wilson, loc. cit.). 
Low tide to} Achelia echinata, Hodge, British Pyenogonoidea, Ann. and 
a few faths. Mag. of Nat. Hist., 3d ser., vol. xiii. p. 115, 1864, A 
(Hodge). good description of this species has been given by Grube, 
St Vaast la Hougue und seine Meeres—besonders seine 
Anneliden-Fauna, Verhandl d. Schles. Gesellsch. f. 
yaterl. Cultur, 1869-72, p. 27 (Separatabdruck). Per- 
haps identical with A. spinosa, Stimpson, Inverte- 
brata of Grand Manan, 1853, p. 37. 
Channel Islands, Isle of Man; 
Durham Coast, St Vaast la 
Hougue, Dutch Coast. 
