502 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



ARGULUS SALMINEI Kr0yer 



Figure 37 



Argulus salminei Kr0yer, 1863-64, p. 89, pi. 1, fig. 1. 

 Argulus paulensis Wilson, 1924, p. 4, pi. 1, figs. 1-5. 



Carapace wider than long, reaching third appendages on male and 

 overlapping them on the female. Cephalic area prominent, sinuses 

 shallow. Eyes light colored and widely separated; dorsal ridges 

 divergent anteriorly, extending very far anteriorly toward the edge 

 of the carapace. Abdomen of female wider than long, anal sinus 

 one- fourth the length, seminal receptacles large; male abdomen 

 longer than wide, anal sinus very shallow and broad, testes occupy- 

 ing most of the available space; anal furnace basal, elongate. 



Antennae slender, slight knob on anterior of lateral hook, which 

 is bent in an arc, distal end of flagellum opposed by a prominent 

 seta; second antennae so slender that the basal segments grade into 

 the distal ones, spines slight, chitinous protuberances almost absent 

 at base of second antennae but larger on ventral of first antennae 

 and at base and near midline of the body. There is not so great a 

 differentiation of the segments of the antennae as in other species. 



Suction cups with narrow rims, supporting ribs tapered and 

 broken into 9 or 10 segments, marginal lappets numerous between the 

 ribs (fig. 37, c). Second maxillae with broad basal plate slightly 

 lobed, medial lobe somewhat longer and narrower; two pairs of 

 postmaxillary spines conspicuous or not, but present at least as 

 chitinous prominences. 



Swimming appendages with flagella, which are very stout on the 

 female and tipped with very long setae. Appendages of female 

 normal, with a small, boot-shaped, natatory lobe on fourth. Second 

 swimming appendage of male has the usual posterior bilobed lamella 

 but with the proximal lobe abbreviated and the distal one elongate 

 (fig. 37, a). The lobe enclosing the socket on the posterior of the 

 third appendage is located dorsally over the groove dividing the 

 basis and coxa, so that the location of the socket cannot be noted from 

 a ventral view, because the opening is on the segment proper rather 

 than on the lobe. The peg is a triangular prolongation of the anterior 

 edge of the basis ending in a number of points; dorsally the end is 

 an oddly shaped movable hook with a flat surface underneath. On 

 the ventral surface of the peg is a fleshy papilla projecting medially 

 much as in japonioiis. The coxa has a small, boot-shaped, natatory 

 lobe posteriorly, well armed with long setae. There is a broad papilla 

 near the male opening. 



The respiratory areas are composed of an anterior subtriangular 

 smaller one and a posterior large one with a notch in the middle of 



