120 



76. Rhynehothalestris rufoeineta (Norman). 



(PI. LXXIII & LXXIV). 



Thalestris rufoeineta Norman (M. S.), in Brady's Monograf of British Copepoda, Vol. 11, p. 125, 



PI. LVII, figs. 19. 



Specific Characters. Female. Body somewhat robust, with the anterior 

 division evenly vaulted dorsally. Cephalic segment considerably exceeding in length 

 the 4 succeeding segments combined, epimeral parts evenly arched and rather deep; 

 rostrum very long and slightly curved, narrow linguiform in shape and acuminate 

 at the tip. Epimeral plates of the 3 succeeding segments rather large, acutan- 

 gular. Last segment of metasome considerably narrower than the preceding ones. 

 Urosome scarcely exceeding half the length of the anterior division, genital seg- 

 ment very large and expanded, sub-quadrangular in outline and distinctly divided 

 in the middle, posterior corners acutely produced and fringed with delicate spinules; 

 2nd segment likewise produced at the posterior corners, the 2 posterior segments 

 simple. Caudal rami quadrangular, broader than they are long, outermost of the 

 apical setae spiniform and scarcely half as long as the innermost, the 2 middle 

 setae very strong and elongated. Anterior antennae with the 1st joint unusually 

 prolonged, distal part not nearly attaining half the length of the proximal one. 

 Posterior antennae with the outer ramus rather fully developed, middle joint much 

 shorter than the other 2. Posterior maxillipeds of moderate size, hand oblong 

 fusiform, with the outer edge sub-angular in the middle, inner straight, dactylus 

 slender. 1st pair of legs with the rami not very slender, the outer one a little 

 longer than the inner, with 2 of the apical claws well developed, apical claws of 

 inner ramus rather unequal. Natatory legs with the inner ramus shorter, but 

 broader, than the outer. Last pair of legs with the distal joint broadly oval in 

 form, inner expansion of proximal joint rather large, though not extending as far 

 as the distal one. 



Male with the inner ramus of both the 2nd and 3rd pairs of legs pecu- 

 liarly transformed, that of 2nd pair having the 2 outer joints coalesced and car- 

 rying on the tip a remarkably strong somewhat hamiform spine, that of 3rd pair 

 distinctly 3-articulate, with the last joint obliquely tapered and terminating in a 

 small lamella provided inside with a short flexuose bristle, inner edge with a 

 regular series of 5 strong setae. Last pair of legs, as usual, smaller than in 

 female, with the inner expansion of the proximal joint shorter and provided with 

 only 3 spine-like setae. 



Body of a clear yellowish hue, more or less distinctly banded with dark 

 reddish brown, sometimes, especially in male specimens, with the whole of the 



