Zoological Society. 219 



2. Branchipus spinosus, M. Edwards. Antennis inferioribus 

 maris magnis, cylindricis, apice acuminatis ; appendicibus an- 

 tenniformibus curtis, crassis ; abdominis segmentis infra spini- 

 feris. 

 Long. 1 poll. 2 lin. 



Branchipus spinosus, M. Edwards, Hist. Nat. Crust, iii. 367. 

 Hab. In lacu salino " Hadjibe," in vicinitate urbis Odessae ; M. 

 Nordmann. 



This species, which was discovered by Professor Nordmann in a 

 salt lake near Odessa, is upwards of an inch in length. The inferior 

 antennae of the male are large, cylindrical, the terminal articulation 

 being sharp at the point. They possess no tooth or process, and the 

 antenniform appendages are very short compared with those of the 

 preceding species, and of a considerable degree of thickness. The 

 front of the head has no prolongation. The feet are short. The seg- 

 ments of the abdomen are armed underneath with sharp spines, and 

 the caudal fins are short and plumose. The male organs are short 

 and obtuse. 



Genus Streptocephaltjs. 



Corpus cylindricum, segmentum caudate pinnis duabus ciliatis in- 

 structum; pedes undecim ; antennce inferiores maris triarticu- 

 latce, valde tortuosce, ad apicem in ramos graciles divisee, ap- 

 pendicibus antenniformibus armatce. 

 In the structure of the body, abdomen, and feet, this genus re- 

 sembles entirely the preceding. The inferior antennse, or cephalic 

 horns, in the male, however, are very different in structure ; they 

 are longer in proportion than the corresponding organs in the Bran- 

 chipus, consist of three articulations, and are singvdarly twisted, and 

 bent as it were into elbows. The terminal joint divides at the apex 

 into two branches. They are inhabitants of fresh water. Only two 

 species have as yet been described, and I now add a third to the 

 number. 



1 . Streptocephalus torvicornis, Waga. Antennis inferiori- 

 bus maris validis, ramis terminalibus elongatis, serratis, interna 

 lonr/iore, processu triangulari bred armato, appendicibus an- 

 tenniformibus elongatis filiformibus ; front e prolongato, acumi- 

 nata ; ovario externo conico. 

 Long, maris 1 poll., fceminee circa 14 lin. 



Branchipus torvicornis, Waga, Ann. Soc. Ent. de France, xi. 261. 

 t. 11. f. 1-4. 



Hab. In vicinitate urbis "Warsaw ; " Krynicki. 

 This species, which was discovered by M. Krynicki in a muddy 

 stagnant piece of water near the town of Warsaw, is upwards of an 

 inch in length, the female being longer than the male. The inferior 

 antennae or cephalic horns of the male are very large, when extended 

 equalling in length the whole body. The basal joint is strong, and 

 broad at its junction with the head ; the second is short, and the third 

 is divided at the apex into two branches, which are long, slender and 

 serrated on their inner edges, the internal one being the longer, bent 



