DESCRIPTION OF GENERA AND SPECIES. 



Order BEANCHIOPODA. 

 Suborder PHYLLOCAEIDA. 



Family Nebaliid^. 

 Paranebalia, Glaus, 1880. 



Paranebalia, Claus, Grundziige der Zoologie, ed. 4, vol. i. p. 576. 



Generic Characters. — General appearance much as in Nehalia. Carapace smooth, 

 oval, lateral parts or valves produced posteriorly to broadly rounded lobes separated 

 above by an angular incision. Eostral plate well developed. Trunk scarcely longer 

 than pleon. Tail rather sharply defined from pleon, with the first segment smaller than 

 the succeeding. Eyes well developed, with distinct visual elements. Antennulte rather 

 stout, with last joint of peduncle produced anteriorly to a serrate lamella; flagellum 

 comparatively short, greatly dilated in male. Antennse slender, with last joint of 

 peduncle elongate and geniculate at the base, flagellum simple, cylindrical, of similar 

 structure in both sexes. First pair of maxUlse with the outer masticatory lobe narrowly 

 produced and abruptly truncate at the end; second pair with palp and exognath well 

 defined but comparatively small. Branchial legs projecting far beyond the edges of the 

 carapace; endopodite very elongate and slender, almost pediform; exopodite also very 

 elongate and produced to a narrow point; epipodite exceedingly small, upper end 

 produced. Pleopoda much as in Nehalia. The two succeeding pairs of rudimentary 

 caudal limbs both inarticulate. Caudal rami much as in Nehalia. 



Remarks. — This genus, founded by Professor Claus upon the description given by the 

 late Dr. v. Willemoes Suhm of his Nehalia longipcs, is chiefly distinguished from Nehalia 

 by the structure of the branchial legs, as also by the male having only the antennular 

 flagellum peculiarly modified, whereas the antennas are quite alike in both sexes. More- 

 over the maxillae exhibit some structural diff"erences apparently of generic value. In all 

 other respects it seems to agree very closely with the typical genus. Only one species 

 is as yet known. 



(ZOOL. CHALU E.XP. — PART LVI. — 1887.) Klck 2 



