410 PERCY SLADEN TRUST EXPEDITION 



though, by an exception to the rule in Carides, the boundary between these two 

 joints is marked by a notch. In H. ceratophthalma the ischiopodite is distinct and 

 even moveably articulated with the meropodite, a condition which I cannot remember 

 to occur in any other Caridean except Hyinenocera. In the second maxilliped of 

 G. fasciolatum (the only species I have been able to examine), the last two joints 

 form a very large scythe-shaped organ. In H. ceratophthalma they are rather smaller 

 than in most Carides. Finally, in the maxillule of G. fasciolatum the outer lacinia 

 is greatly enlarged, while in H. ceratophthalma it is of quite normal dimensions. In 

 the characters of the second maxilla and mandible, however, H. ceratophthalma agrees 

 very well with Gnathophyllum. Both the lobes of the maxilla are lost, and the mandible 

 is simple, without palp, and of a slender, curved shape, with a blunt end provided 

 with small teeth. I would suggest that it is advisable to establish a new genus of 

 Gnathophyllidse for Dr Balss's species. Phyllognathia would be an appropriate name 

 for this species, which undoubtedly links Hymenocera with Gnathophyllum. 



In Dr Balss's specimen the smaller leg of the second pair and the tip of the rostrum 

 were missing. My specimen enables me to state that the rostrum slightly outreaches 

 the antennular stalks and has the formula |, and that the smaller leg of the second 

 pair has the same features as the larger but a somewhat narrower palm and less 

 pronounced serration of the moveable finger. The larger leg of this pair is missing 

 in my specimen ; which was taken in S. Nilandu Atoll. 



Genus Hymenocera. 



The mandible of Hymenocera is of the same shape as that of Gnathophyllum, save 

 that it is flattened and ends in a serrated cutting edge, as though it represented the 

 incisor process of the complete malacostracan mandible. In point of fact, however, there 

 can be little doubt that it is really the molar process. The maxilla has a small outer 

 lobe, which, however, retains traces of a notch. The telson is of precisely the same type as 

 that of GnathopJiyllum. The telson of Crangon is of the same type but more elongate. 

 That of the Processidse is more like those of the Pontoniinae. The telson of Glypho- 

 crangon is a much modified structure which has lost all spines. 



22. Hymenocera elegans Heller, 1861 (Plate 59, fig. 10). 



Verh. zool. hot. Ges. Wien, xi. p. 25 ; Sitzber. Ak. Wiss. Wien, xliv. i. p. 264, 

 PL 3, figs. 9—14 (1861). Ortmann, Speng. ZooL Jahrb. Syst. v. p. 511, PI. 37, fig. 11. 

 A specimen was taken in Ooetivy, Seychelles. 



Family PnocESSiD^. 

 Genus Processa. 



23. "i Processa processa (Bate), 1888. 



Nika processa, Bate, "Challenger" Macrura, p. 527, PL 95 (1883). 

 A specimen from the Seychelles which probably belonged to this species was 

 unfortunately destroyed by an accident while it was under examination. 



