34 THE VOYAGE OF H.M.S. CHALLENGER. 
} 
‘Depth in Fathoms. Name. Geographical Distribution. 
- (4 Phoxichilidium johnstonianum, White (sp.). “Nymphon | South Seas. 
johnstonianum, White, Proc. Zool. Soc. of London, 
vol. xv., 1847. There can be no doubt that this species 
belongs to Phoxichilidium : eyes situated above the 
insertion of the chelicera (mandibles); beak (pro- 
boscis) springing from the under side of the head ; 
chelicera with two basal joints, &c. The description, 
however, is hardly sufficient. What White describes 
as palpi are in all probability the ovigerous legs, 
(2) (2)Phoxichilidium phasma, White (sp.). Nymphon phasma, | South Seas. 
White, Proc. Zool. Soc. of London, vol. xv., 1847. 
Whether this species also belongs to this genus or is 
to be considered as a Pallene (it is certainly not a 
WNymphon) is not to be ascertained. White says it may 
possibly be the other sex of the preceding ..... 
Oomerus, Hesse (1874). 
Oculiferous tubercle placed at the base of the proboscis ; mandibles with long pincers ; 
palpi represented by small knobs ; ovigerous legs not present in the female. 
(1) (1)Oomerus stigmatophorus, Hesse, Ann. d. Sc. Nat. Zool., | Brest (Bretagne). 
5®me série, xx., 1874, art. 5, p. 18, pl. viii. In all 
probability this is a species of the genus Phowichili- 
dium, Milne-Edwards. Only a female without oviger- 
ous legs, and with highly developed ovaries in the 
fourth joint of the leg, was observed by Hesse. 
Family IV. PaoxicHitm 
Contains those Pycnogonida, which have neither mandibles nor palpi, or have them 
rudimentary. Ovigerous legs, as a rule, only in the males, whereas Hannonia possesses 
them in both sexes; always without denticulate spines. Genera: Hannonia, Phowichilus, 
Pycnogonum. 
Depth in Fathoms. Name. | Geographical Distribution. 
Hannonia, Hoek (1880). 
Mandibles rudimentary, chelate, two-jointed ; no palpi ; ovigerous legs ten-jointed, 
present in both sexes, 
Shore. *Hannonia typica, u. sp. A short-legged species, a true 
littoral form, with very characteristic features. 
Cape of Good Hope. 
