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258 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
(without proboscis and abdomen) (figs. 10, 11). Proboscis elongate, swollen 
in middle. Abdomen elongate, spinose, nearly half as long as rest of body. 
Eye-eminence very prominent with blunt apex ; eyes small, hinder at higher 
level than forward pair (fig. 10). Chelifori with elongate slender scape 
showing a trace of jointing only (figs. 10, 11, 14); “‘ hand ” stout, beset with 
spines, “fingers” stout and strong with marked shearing edges (fig. 13). 
Palp vestigial, as usual in the genus (figs. 14, 15). Oviger eight-segmented 
(fig. 16). Legs with 2nd coxal segment three times as long as first (fig. 10); 
thigh with a few long denticulate spines and a blunt apical process (fig. 10); 
ist tibial segment as long as thigh, beset with numerous denticulate spines, 
most of which are set on finger-like processes (figs. 10, 18); 2nd _ tibial 
segment one-fifth longer than first, with numerous slender spines and bristles; 
propodus with six strong basal spines, and very large accessory claws which 
almost equal the principal claw in length (fig. 20). 
Halitat. Wasin Channel, coast of British Hast Africa, 10 fathoms, 1902. 
A single female. (Typein University Museum, Cambridge.) 
This curious and beautiful pyenogon is perhaps the most interesting species 
of that remarkable genus Pallenopsis yet discovered. The broad form of the 
body and the partial fusion of the segments would lead to the inclusion of 
the species in the subgenus Rigona, recently proposed by Loman (1908, 
pp. 67-8) for some Malayan and Australian members of Padlenopsis. In 
those species, however, it is stated that the scape of the cheliforus is altogether 
unsegmented, while in P. Crosslandé there is a distinct trace of jointing. The 
oviger is apparently eight-segmented, owing to the fusion of the seventh and 
eighth and the ninth and tenth segments (fig. 16), a condition noticeable in 
other female Pallenopsis. In the legs the curious finger-like processes on 
the first tibial segment are especially noteworthy (fig. 18). These, and 
indeed the legs generally, are beset with the prominent openings of numerous 
cuticular glands, provided at the edge of the orifice with small sharp spines 
(fig. 19). The elongate spines on the thigh and the first tibial segment are 
highly denticulate (figs. 10, 18). Another noteworthy feature is the great 
length of the accessory claws (fig. 20), nearly equalling the principal claw. 
The variation of this character in the genus Pallenopsis is remarkable and 
instructive. 
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References. 
1907. G. H. CarpeNrER.—Percy Sladen Trust Expedition—Pyenogonida. 
Trans. Linn. Soc. (2) Zool. vol. xii. 1907, pp. 95-101, pls. 12, 13. 
1908. J. C. C, Loman.—Die Pantopoden der Siboga Expedition. Leiden, 
1908. 
