148 DR. BAIRD ON NEW PHYLLOPODOUS CRUSTACEANS. [May 13, 



extremity 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 E. 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. 



Hab. Stagnant water on the banks of the Tigris, near Bagdad. 

 Collected, along with E. dahalaceiisis, by the late W. R. Loftus, 

 Esq., in May, 1855. {Mus. Brit.) 



4. EsTHERiA RUBiDGEi, Baird. (PI. XV. figs. 3, 3 a, 3 b.) 



Carapace-valves ovate. Dorsal margin long, straight. Umbones 

 stnall, 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, E. dahalacensis and E. macgillivrayi . 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 3^ 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. (Miis. Brit.) 



5. EsTHERiA MACGILLIVRAYI, Baird. (PL XV. figs. 5, 5a, 55.) 



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 E. 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 (/. 

 Macgillivray). (Mus. Brit.) 



6. EsTHERiA CALDWELLi, Baird. (PI. XV. figs. 4, 4 a, 4 b.) 



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. 



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