16 On some new Parasitic Copepods on Fish. 



Fig. 2. Male of same. 



2 a. Anterior portion of cephalotliorax. 2 b. Hamulus. 2 c. Pos- 



terior antennae, 'id. Last joint of first maxilliped. 

 2/. Second maxilliped. 

 Fig. 3. Caligus cyhii, § , sp. n., enlarged. 



3 a. Anterior portion of cephalothorax. 3 b. Furcula. 3 c. First 



peraeopod. 3^, e, f. Second, third, and fourth perseopods. 

 3 h. Caudal plate. 



Plate III. 



Fig. 1. Caligus hirsutus, 2> enlarged. 



1 a. Anterior portion of ceplialothorax. 1 b. Furcula. 1 c. Last 

 joint of fourth peraeopod, highly magnified. Id. Caudal 

 plate. 

 Fig. 2. Male of same, enlarged. 

 Fig. 3. Caligus Fhipsoni, $, sp. n., enlarged. 



3a. Anterior portion of cephalothorax. Sb. Caudal plate. 

 3 c. Second maxilliped. 3 d. Fourth peraeopod. 3 e. Furcula. 

 lig. 4. Male of same, 



Plate IV. 



Fig. 1. Caligus longicaudus, $ , sp. n., enlarged. 



1 a. Cephalothorax from beneath. 1 b. Furcula. 1 c. Fourth 



peraeopod. 1 d. Angle of genital segment and fifth peraeo- 

 pod. le. Caudal plate. 1/. Third peraeopod. 

 Fig. 2. Male of same. 



2 b. Second antennae. 2 c. Second maxilliped. 

 Fig, 3. Caligus (Scicenophilus') Bcnedeni, 5 . 



3 a. Cephalothorax from below. 3 b. Fourth peraeopod. 



3 c. Caudal plates. 3 d. Second maxilliped. 



Plate V. 



Fig. 1 . Helleria armata, 5 , gen. et sp. n. 



1 a. Cephalothorax from beneath, much enlarged. 1 b. Seen 



from the side. 1 c. Margin of second maxilliped. 1 d. Mouth- 

 organs. 1 €.,/, g. First, second, and third peraeopods. 

 1 h. Anterior antennae, much enlarged. 

 Fig. 2. Male of same. 



2 a. Cephalothorax from beneath, much magnified. 2 b. Caudal 



extremity. 2 c. Caudal appendage. 2 d. Second antennae, 

 terminal joint. 2/. Lower lip and one of the styles. 



Plate VL 



Fig. 1. Bracliiella appendiculosa, $, much enlarged, seen from side. 



1 a. Organ of adhesion. 

 Fig. 2. Ditto, seen from underneath. 

 Fig. 3. Male of same. 



3 a. Mouth-organa. 3 b. Antennae. 3 c, d. First and second 



maxillipeds. 

 Fig. 4. Chondracanthus elongatus, $ , much enlarged, from underneath. 

 Fig. 5. Ditto, seen fi-om side. 

 Ftg. 6. Male of same, highly magnified. 



6 a, b. First and second maxillipeds. 



