424 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxxii. 



host" (the stickleback). Without being able to prove their actual death 

 as a result of the fungoid growth, niau}' specimens of North American 

 Arguli, of both the salt and fresh-water forms, have been obtained 

 which showed the presence of such parasitic plants. 



EXPLANATION OF PLATES. 



Plate XXIX. — The male of Arguhis cato.ttemi. 



Fig. 1, dorsal view; fig. 2, first antenna; fig. 3, second antenna; fig. 4, second max- 

 illiped; fig. 5, basipod of second swimming leg, dorsal view; fig. 6, basipod of third 

 leg, ventral view; fig. 7, basipod of fourth leg, ventral view; fig. 8, testes and sperm 

 receptacles; fig. 9, basipod of second leg, ventral view (turned from a horizontal to a 

 vertical position), showing the appendage. 



Plate XXX. — The newly hatched larva of Argulus funduli. 



Fig. 10, dorsal view; fig. 11, first and second antenna; fig. 12, the mouth tube; fig. 

 13, first maxilliped; fig. 14, second maxilliped. 



Plate XXXI. — The newly hatched larva of Argulus maculosus. 



Fig. 15, three freshly laid eggs, showing their arrangement and the form assumed 

 by the jelly envelope; fig. 16, dorsal view of larva; fig. 17, first antenna; fig. 18, sec- 

 ond antenna with temporary rowing apparatus; fig. 19, temporary mandibular palp 

 at the base of the mouth tube; fig. 20, second maxilliped; fig. 21, first swimming leg; 

 fig. 22, second, third, and fourth swimming legs. 



Plate XXXII. — The male and female of Argulus appendiculosus, new species. 



Fig. 23, dorsal view of female; fig. 24, dorsal view of male; fig. 25, first and second 

 antennye of female; fig. 26, mandible; fig. 27, second maxilliped; fig. 28, basipod of 

 third leg of male; fig. 29, fourth leg of female; fig. 30, foiirth leg of male, ventral 

 view, showing the enormous boot-shaped appendage on the basipod. 



