COPEPODS OF THE WOODS HOLE EEGION 



13 



^jiuiuumujuil^^^ 



give very satisfactory evidence. A triangular piece cut out of the 

 side of one of the sucking disks and flattened under a cover glass 

 will show the structural details of the supporting rods. 



ARGULUS FUNDULI Krj<yer 

 FiGUKE 1 



Argulus funduU Kr0ybr„ Naturh. Tidsskrift, ser. 3, vol. 2, p. 94, pi. 2, figs. 

 1, a^ff, 1863.— Wilson, Proc. U. S. Nat. Mus., vol. 25, p. 710, pi. 14, figs. 

 23-27, 1902. 



Host and locality. — Outside surface of the two common killifishes 

 at Woods Hole, Fimdulus heteroclitus and F. majalis. 



Disti'ihution. — New Orleans, La. (Kr0yer) ; Waquoit, Mass.; 

 Long Island Sound, N. Y. ; Beaufort, N. C. (Wilson). 



Color. — Yellowish white 

 mottled with pale rust col- 

 or, the dorsal surface of the 

 ovary and testes heavily 

 spotted with dark brown ; 

 eyes and semen receptacles 

 a lighter shade of brown. 



Female. — Carapace o r - 

 bicular, wider than long, 

 the lateral lobes scarcely 

 reaching beyond the second 

 thoracic segment, the poste- 

 rior sinus wider than deep ; 

 urosome less than one-third 

 as long as the carapace, longer than wide, cut to its center, the poste- 

 rior lobes bluntly rounded, caudal rami basal. No flagella. Teeth on 

 basal plate of maxillipeds short and blunt, the inner one removed from 

 the other two; maxillary disks enormous, the supporting rods 18- 

 to 20-segmented, segments shaped like a stack of butter dishes. 

 Anterior respiratory area some distance in front of posterior one 

 and fully as wide. Total length, 4r-5 mm. Width of carapace, 

 3-3.5 mm. 



Male. — Carapace even shorter than in the female ; urosome longer, 

 half the length of the metasome, and three times as long as wide, 

 not cut to the center, the posterior lobes acute or rounded. Basi- 

 pods of third and fourth legs with wide posterior flaps, the peg on 

 the fourth legs large and blunt; second legs unmodified. Total 

 length, 3^ mm. Width of carapace, 1.5-2 mm. 



Remarks. — This species, like its two hosts, is found indiscrimi- 

 nately in salt or brackish water. It is not so common as would be 

 expected from the abundance of its hosts. 

 71937—32 3 



FiGUEB 1. — Argulus funduU: a, Male, dorsal ; b, 

 supporting ribs in edge of sucking disk 



