289 



191. Orthopsyllus linearis (Glaus). 



(PI. CXCIX). 

 Lilljeborgia linearis, Glaus, Die Copepoden-Fauna von Nizza, p. 22, PI. II, figs. 18. 



Syn : Cletodes linearis, Brady. 



Specific Characters. Female. Body slender, linear in form, being almost 

 of equal width throughout, all segments, except the last two, bordered behind with 

 a regular row of strong denticles. Cephalic segment comparatively large, about 

 equalling in length the 4 succeeding segments combined, rostral projection con- 

 siderably produced and somewhat lamellar, with a very distinct notch on each 

 side of the blunted tip. Urosome about the length of the anterior division, none 

 of the segments produced at the lateral corners, penultimate segment very small 

 and imperfectly defined from the last, which is about twice as large; anal opercle 

 distinctly denticulate. Caudal rami somewhat divergent and rapidly tapering dis- 

 tally, with 2 somewhat distant setae on the outer edge, dorsal seta issuing at a 

 short distance from the end, middle apical seta rather strong and not jointed at 

 the base. Anterior antennae very coarsely built, and composed of only 4 joints, 

 the 2nd produced behind to a strong claw-like projection, 3rd joint longer than 

 2nd, terminal joint considerably smaller; none of the setae on these antennae cili- 

 ated. Posterior antennae likewise strong, with the terminal joint fully as long as 

 the basal one, outer ramus carrying 4 sub-equal ciliated setae, 2 apical and 2 

 lateral. Mandibular palp with the terminal joint very small and imperfectly de- 

 fined from the basal one. Posterior maxillipeds moderately strong. 1st pair of 

 legs with the outer ramus about the length of the proximal joint of the inner, 

 1st joint fully as long as the other 2 combined, last joint with 4 apical appen- 

 dages, the outer 2 spiniform, the inner 2 terminating in a thin seta carrying at 

 the end delicate cilia; inner ramus with a well-defined seta inside the proximal 

 joint, distal joint scarcely more than half as long as the latter, and carrying at 

 the tip 2 unequal appendages, the outer one somewhat claw-like, the inner much 

 longer and of a similar structure to that of the 2 inner apical appendages of the 

 outer ramus. The 3 succeeding pairs of legs with the outer ramus rather stout, 

 and having at the inner corner of the terminal joint a slight rudiment of a seta, 

 inner ramus very short, with 3 partly spiniform setae at the tip. Last pair of 

 legs with the distal joint confluent at the base with the proximal one, and car- 

 rying 6 comparatively short ciliated setae; inner expansion of proximal joint ex- 

 tending almost as far as the distal one, and provided with 5 marginal setae. 



Male with the anterior antennae exceedingly strong, and composed of 6 

 well-defined joints, the 4th greatly inflated, terminal part distinctly biarticulate, 



