A Singular Parasitic Isopod Crustacean, etc. [January, 



o. Twelfth to sixteenth segment (abdominal segments, pleopods concealed). 

 t. Telson, uropods covered beneath the dorsal bent. 

 Fig. 3. — Profile view of embryo; dorso-ventral. 

 a. Head. 



Fig. 4.— Older embryo in larval skin. Lateral view. 



Fig. 4<z. — Telson or fourteenth segment with the uropods of Fig. 4 in larval si 



Highly magnified. Showing pigment. 

 Fig. 4<J. — One of the pereiopo ■ larval skin. 



dd. Remnant, of eai 

 Fig. 5.— Latest larval stage. 



per. The six pereiopods. 

 /. s. Seventh free segment 

 plpd. The five pleopods. 



EXPLANATION OF PLATE II. 



Fig. 6.— Stellar form of pigment of adult male; from dorsal 

 Fig. 7. — Leg of adult male Bopyrus. 

 Fig. 8. — Antenna of male B. magnified 500 X- 

 FlG. 9. — One of the maxillae with palpus of the female. 

 arthr. Original joint. 



/. Maxillary palpus with nine tentacles. 

 /. Disconnected part (from the other half). 

 ft. Anterior free lobe. 



Fig. II. — Outline of one of the abdominal appendages (gills) of female. 



/. Smaller, thicker lobe, put aside. 

 Fjg. 12. — Schematic figure showing position of the two maxilhe underneath the 



