TEKRBSTRIAL ISOPOD ELUMA C^r.ATDM. 105 
6th smaller, the 7th a long fine spine, 8th and 9th very small, 9th and 10th 
faintly denticulate, setose on the outer border of the lobe ; inner lobe pro- 
longed on the outer side terminally, with two short setose spines. Maxilli- 
pedes (fig. 6) with comparatively small lobes, outer lobe 3-jointed, 1st joint 
short, with two large spines, 2nd joint also with two large spines, 3rd joint 
terminating in a number of spinous processes ; inner lobe with a single long 
pointed spine, and two tooth-like spines towards the inner border. The seg- 
ments of the mesosome (figs. 7-9) strongly convex, subequal, pleural plate 
of the 1st segment flanking the cephalon anteriorly, strongly curved, lateral 
margin thickened, posterior angle notched. Pleural plates of 2nd to 7th 
segments excavate anteriorly, ventral margin of 2nd to 4th indentate, 6th to 
7th truncate. Uropoda (figs. 10 & 11) short, but longer than wide, extend- 
ing beyond the telson ; basipodite robust and thickened, antero-dorsal surface 
expanded, articulating ventro-anteriorly ; exopodite flattened, expanded, and 
'laminate, protruding on the inner side; endopodite styliform, longer than 
the exopodite, widest just above the middle, with terminal setaceous pad and 
spinous setaj. Telson (fig. 12) roughly triangular, with rounded apex, width 
greater than the length, not extending beyond the pleural plates of the last 
segment of the metasome. 
Length ll'O mm. 
Colour (in alcohol) a light coffee-brown. 
Hab. Hill of Howth, Co. Dublin, Ireland {JJ. R. Pack-Beresford). 
In the figure given by Mr. Pack-Beresford {op. cit. pi. 10) the distal 
joint of the flagellum of the antennae is too short and no style is shown, 
whilst the pleural plates of the metasome are scarcely long enough ; further, 
the last segment extends more posteriorly than is shown in his figure ((/. 
PI. 8. fig. 12). 
The distribution of this species is as yet only very imperfectly known. It 
was originally described from Cayenne, French Guiana, South America. 
Budde-Lund * says it is "commonest in the Island of Madeira." ... "I 
have seen some from Cayenne taken by Don Gelski." . . . "Two specimens 
taken by Professor Reinhardt in the Island of Nicobar, and determined hy t 
CI. Kroyer under the name of Armadillidium purparascens, are preserved in 
the Museum at Copenhagen." %. 
Dollfus § records it from many localities. He states : — " The genus Eluma 
is entirely Western, and contains only one species, E. purpurascens, B.-L., a 
woodlouse of a purple-red colour, remarkable for its simple eyes. Very 
abundant in the Atlantic archipelagos, in the Canaries, the Azores, and 
Madeira ; it occurs again at ('intra (Portugal), and in Western Algeria, but 
* Crust. Isop. TeiT. 1885, p. 48. 
t Mr. Pack-Beresford {op. cit. p. 257) translates this described by. 
X Dr. K. Stephenson has very kindly referred to these specimens and sent me notes thereon. 
§ 3 Congres Intern. Zool., Leyden, 1895, p. 357. 
