220 Zoological/Society . 



into the form of a hook, and having on its external edge a process of 

 a triangular form and acuminated at the point. The first and second 

 joints are armed with several minute teeth, and the antenniform ap- 

 pendages are straight, slender, but somewhat stouter than the supe- 

 rior antennae. The front of the head is prolonged into a prominence 

 which is pointed. The inferior antennae in the female are flat, and 

 obtusely rounded at the extremity. The ovarian bag is conical in 

 shape and of a blue colour. The caudal fins are of considerable size 

 and plumose on their edges. 



2. Streptocephalus cafer, Loven. Atttennis inferioribus 

 maris longis, articulo basalt intus appendice lacinulata brevi 

 prcedito, ramo terminali interno lonyo, flexuoso, inermi ; fronte 

 prolongato, in rostrum lunation producto ; ovario extemo cali- 

 gceformi. 



Long. 15 millim. 



Branchipus cafer, Loven, Kongl. Wet. Akad. Handl. 1845, 433. 

 t. 5. f. 1-20. 



Hub. In paludibus terree Cafrorum Natalensium ; Wahlbery. 



This species was discovered by M. Wahlberg in some pools of 

 fresh water in Port Natal, and is about 15 millimetres in length. The 

 inferior antennae or cephalic horns in the male are long stout organs 

 and flexuose in shape. The basal joint is rather short, rounded, and 

 is furnished at its base on the internal edge with a short appendage 

 of a lanceolate form and toothed on its edge externally. The third 

 joint divides at the apex into two branches, the internal one being 

 long, slender and flexuose, the external being club-shaped and forked 

 at the extremity, dividing into two other slender branches of unequal 

 length. The antenniform appendages are filiform and flexuose. The 

 front of the head is prolonged into a narrow deflected beak, which is 

 forked at its extremity. The male organs are long and slender ; they 

 are composed of four articulations, the last of which is much the 

 longest, is curved, and armed on each side with a numerous row of 

 teeth and spines. 



In the female the cephalic horns are broad, thick, and furnished 

 with a sharp hooked point at the extremities. The caudal fins are 

 of considerable size and finely plumose. The oviferous sac is long 

 and narrow, and resembles very much in shape a long stocking or 

 boot. The ova are of a rosy colour. 



3. Streptocephalus similis, Band. Antennis inferioribus 

 maris longis, cylindricis, appendice lunulata destitutis, ramis 

 terminalibus prcecedenti similibus, appendicibus antenniformibus 



filiformibus elongatis ; fronte prolongato, in rostrum bilobatum 

 producto ; ovario externa conico. 

 Long, maris 81in., fcem. 6 lin. 



Hab. In insula "St. Domingo," in India Occidentali. Collegit 

 M. Salle. Mus. Brit. 



This species, which was found by M. Salle in the island of St. 

 Domingo in the West Indies, is of a slender and cylindrical form. 

 The male is about fths of an inch in length, and the female half an 



