236 
HORN EXPEDITION—CRUSTACEA. 
(3) Estheria diclyon, sp. n. (Figs. 6, 7, 8.) 
Carapace moderately tumid, seen from side ovoid, beaks prominent. Dorsal 
margin behind umbones straight, anteriorly to umbones curving downwards to 
meet the almost straight ventral margin, then curving obliquely upwards to the 
dorsal margin. Lines of growth about nine in number, not crowded at the margin, 
strongly marked, of a light colour, and provided with short, stout seta3. Inter¬ 
spaces of lines of growth marked with strong raised white lines, arranged so as to 
enclose roughly hexagonal spaces. 
The head differs slightly from that of E. packardi^ in that its upper edge 
projects at right angles to the cervical segment, instead of sending a lingual 
projection upwards to overlap it. The two eyes are not confluent, and can be 
clearly distinguished from one another, being separated by a narrow line which 
completely isolates them from one another. The antennules have about seventeen 
small projections on the anterior border. Antenme with about twelve to fourteen 
joints. The legs are about twenty-five in number. Telson with about eight to 
eleven spines of varying size on the dorsal margin. The spines on the inner distal 
face of the caudal appendages are very minute. In other respects the species 
agrees closely with E. packardi. 
Locality. —A large number of dried specimens of the species were obtained 
during the Expedition at the Palm Creek in the James Range. 
About a dozen spirit specimens, all females, were received from the Adelaide 
Museum, and labelled South Australia. 
(4) Estheria packardi, Brady. (Figs. 9, 10, 11, 12, 13, 14.) 
Reference—Brady, Proc. Zool. Soc. London, 1886, p. 85, Fig. C. 
Sars, Archiv for Mathematik og Naturvidenskab, B. XVII., Nr. 2, pp. (of 
reprint) 28-35, Pis. 4, 5. 
Brady’s definition and figure of the species leave much to be desired, but 
Professor G. 0. Sars has described the general structure of the typical variety with 
great minuteness and accuracy. For the loan of a copy of his paper we are 
indebted to Mr. J. Whitelegge, of the Australian Museum, Sydney. 
Specific characters. —We extract the following from Professor Sars’ descrip¬ 
tion :—“Shell rather tumid and, seen from the side, of oval or elliptic form, with 
the umbones well defined and occurring much nearer the anterior than the 
