544 DR. J. G. DE MAN ON CRUSTACEANS [ Dec. 12, 
9. Distance between the extraorbital angles as long as the length 
of the carapace; no epigastric lobes ........... ee § Offinis. 
3. Both fingers with a tuft of hair proximally .. 
3, A tuft of hair in the finger-cleft and extending along the fixed 
finger; carapace hardly broader than long , depressed ; teeth 
of the antero-lateral border sharp and salient ; imner ane 
of the wrist produced to form a long spme ...... . onyx. 
10. Exognath of external maxillipedes, in the adult male, ‘more 
than twice as broad as the ischium ; epigastric lobes ‘want- 
ing; a brush of stiffish hair at the ap of the fixed oes 
externally .. riedelit. 
PAE Se var. pilosa. 
10. Exognath, in the eran nies not once — a half ¢ as ae as 
the ischium cebedons 11. 
11. Upper surface of the carapace ‘granulated 1 near the antero- 
lateral margins; second and third antero-lateral teeth of the 
carapace not salient; epigastric lobes distinct ; granulated 
ridge behind the frontal border ee separated from it 
in the middle .... . pusillus. 
11. Upper surface of the carapace, which is broader “anteriorly 
than that of puséllus, not granulated near the antero-lateral 
margins; second and thir d antero-lateral teeth more salient 
than those of pusillus; epigastric lobes distinct; granulated 
ridge behind the frontal margin contiguous to it in the 
faiddle dane’ SA-adanbendst-tey ts lon geeseemeneeels. Aantal dias aetna t Mei nm Bacrsacus’ 
Artificial key to the known females of the species of 
Ptychognathus. 
1. Carapace hardly broader than long, front prominent, nearly 
straight .. 2. 
1. Carapace decidedly broader than long, front little prominent 
and distinctly sinuous.. ou 
2. Regions of the flat, though not ‘par ticular ly depressed carapace 
al epigastric lobes distinct : ; antero-lateral teeth of the cara- 
pace sharp and salient.. ; .. dentatus. 
2. Regions of the much depressed ‘and quite flat. carapace ‘har dly { ricdelii 
indicated; no epigastric lobes ...............ec.ccc cece 6 
andamanicus. 
3. Upper surface of the carapace granulated near the antero-lateral 
margins; ridge behind the frontal margin distinctly separated 
from it in the middle ; exognath of external maxillipedes 
distinctly less broad than the ischium ..... . pusillus. 
3. Upper surface of the carapace, which is anteriorly roader than 
that of pusillus, not granulated near the antero-lateral 
margins; ridge behind the frontal margin contiguous to it 
in the middle; exognath of outer footjaws just as broad or 
very slightly broader than the ischium ....0.....00.000.......... barbatus. 
PatezmMon (EupaL#@Mon) LAR Fabr. var.? (Plate XVIII. 
figs. 7-19.) 
One male and one female without eggs from a freshwater 
pool, Christmas Island. 
During the two or three last decennaries several carcinologists 
have regarded a more or less large number of described species of 
the subgenus Eupalemon as synonyms or, at the utmost, as 
individual or local varieties of Palemon (Hupalemon) lar Fabr. 
(confer: de Man, in ‘ Notes from the Leyden Museum,’ 1879, 
pp. 168-173; Ortmann, in ‘Zoolog. Jahrbiicher (Spengel),’ v. 
Abth. f. Syst. 1890, p. 724; Coutiére, in ‘Annales Sciences 
Naturelles,’ Zool. 8™° série, t. xii. 1900, p. 292, and other papers 
of the same authors). Several specimens of Pal. lar Fabr. from 
