148 DR. BAIRD GN NEW PHYLLOPODOUS CRUSTACEANS, [May 13, 
extvemity swollen, rounded, and broader than the posterior, which 
is rather narrow, and somewhat compressed. Ribs of carapace few, 
broad ; interstices marked with coarse-looking, raised, flexuous lines. 
This species resembles in form the L. tetracera as represented by 
Krynicki, and found by him near Moscow and at Charkow, Russia. 
Length of carapace, rather more than 4 lines; breadth at umbo, 
3 lines. 3 
Hab. Stagnant water on the banks of the Tigris, near Bagdad. 
Collected, along with Z. dahalacensis, by the late W. R. Loftus, 
Esq., in May, 1855. (Mus. Brit.) 
4, EsTHEertA RuBIDGE!, Baird. (Pl. XV. figs. 3, 3a, 30.) 
Carapace-valves ovate. Dorsal margin long, straight. Umbones 
small, placed near the anterior extremity. Ventral margin slightly 
rounded. Anterior extremity rounded. Posterior extremity emar- 
ginate at upper part, giving it somewhat the appearance of the shell 
of an Avicula. Anterior extremity rather the larger. Ribs of cara- 
pace not numerous, and wide apart, the surface in the interspaces 
marked with coarse and flexuously disposed raised lines. 
This species partakes of the characters of straight-dorsal-margined 
species, 2, dahalacensis and 7. maegillivrayi. From the last spe- 
cies it differs in size, form of posterior extremity, and markings of 
interspaces between the ribs, as well as their comparative size and 
number, those of the present species being fewer and wider apart. 
Length of carapace, about 34 lines; breadth at umbo, 2 lines. 
Hab. A dried-up “vley” near Port Elizabeth, Cape Colony. 
Collected by Dr. Rubidge, and communicated to Henry Woodward, 
Esq., by W. S. M. D’Urban, Esq. (Mus. Brit.) 
5. EsTHERIA MACGILLIVRAYI, Baird. (Pl. XV. figs. 5, 5a, 56.) 
Carapace-valves ovate. Dorsal margin long, straight. Umbones 
small, placed about 1 line from the anterior extremity. Ventral 
margin rounded. Anterior extremity rounded, as well as posterior, 
both being of nearly equal size. Ribs of carapace numerous, narrow, 
and finely punctate in the interstices. 
In general outline this species resembles very much /. dahala- 
censis ; but the ribs are narrower, more numerous, and the surface of 
the interstices is much more finely punctate. 
Length of carapace, about 5 lines; breadth at umbo, 3 lines. 
Hab. Brackish lake, Green Point, Cape of Good Hope (J. 
Macgillivray). (Mus. Brit.) 
6. EsTHERIA CALDWELLI, Baird. (PI. XV. figs. 4, 4a, 45.) 
~ Carapace-valves swollen, ovate, of a pale horn-colour. Umbones 
large, prominent, and ferruginous-coloured, placed at about one-third 
distance from the anterior extremity. Dorsal margin short, and nearly 
straight. Anterior extremity rounded, short, a little broader than 
posterior extremity, which is long and rounded. Ventral margin 
rounded. Ribs of carapace numerous, rather narrow. Interstices 
roughly and strongly punctate. 
Ma .- 
