HORN EXPEDITION—CRUSTACEA. 
235 
IMeasurements of an 
Average 
Specimen. 
Length. 
Height. 
Thickness. 
Male ... 13 5 mm. 
8 mm. 
6 mm. 
Female ... 12 ,, 
• 7 „ 
5 „ 
Colour in spirits a rich brown. 
Lilies of growtli ridge-like, from about twelve to sixteen in number. Setie 
and spines absent. Sculpture between lines of growth irregularly reticulate. 
Head .—Cervical region rounded. Upper (posterior) part of frontal region 
projecting as a horizontal Hat shelf, from the outer margin of which the frontal 
line is continued vertically downwards. Eyes confluent, situated on a very slight 
elevation. Frontal region curving downwards and backwards into the rostrum, 
which is blunt and broad in the male, while in the female it is still blunter and 
shorter. First antenna; in the male reaching about half the length of the 
flagellum of the second antenme, and slightly shorter in the female. Second 
antenme with about thirteen joints in each of the distal divisions. Inner surface 
of the proximal portion as in E. packardi. Number of appendages twenty-seven 
in both sexes. 
The labrum and appendages generally are practically identical with those of 
E, packardi. 
Telson with dorsal edge armed with a very small number (three or four) of 
short stout spines. 
The collection comprised seventeen specimens, nine being females and eight 
males, in addition to a few empty carapaces. 
Locality .—Valley of Stevenson River, Central Australia, in a clay-pan. 
We also received three examples from Professor R. Tate, from the head of 
the Anna Creek. 
So far as is yet known, this species is peculiar to the Eremian region. 
The general form of the carapace approaches that of E. compleximanus from 
Kansas, as figured by Packard.* The two species, however, difler in many points, 
the dissimilarity in the telsons being one of the most striking. 
* Phyllopods of North America. Twelfth Annual Report of U.S. Geol. and Geog’. Survey. Part I. 1883. 
