REPORT ON THE COPEPODA. 129 



sides and abruptly truncated apex, nearly as long as the last three segments ; one short 

 seta on external margin, one at the angle, and two much longer at the apex ; one small 

 seta also attached to the face of the lamina, not far from the inner angle. Anterior 

 antenna (fig. 13) six-jointed, setae numerous and longer than the limb ; finger of 

 posterior antenna (fig. 14) equal in length to the second joint; basal joint produced at 

 the inner distal angle, which is armed with two long but rigid setae ; second joint elon- 

 gated, slender, its inner border slightly convex and bearing a short, almost lancet-shaped 

 seta near the base; third joint rudimentary, oblique, and bearing two very small setae; last 

 joint very long, slender, and produced into a slightly curved, awl-shaped apex ; its outer 

 margin bears, near the middle, two very minute seta?. Branches of the fourth pair of feet 

 nearly equal in size (fig. 15), marginal spines lancet-shaped and finely serrated ; fifth pair 

 almost obsolete (fig. 16, a,a), consisting of a tubercle with two setse. Eyes (fig. 17) coales- 

 cent. The shape of the male (fig. 11) is oblong oval, about thrice as long as broad, 

 almost equal in width throughout, and scarcely at all tapered either in front or behind; the 

 first four abdominal segments are lunated and very much imbricated. 



Habitat.— -Lat. 17° 54' N., long. 117° 14' E. (Station 206); lat. 3° 10' N., long. 

 14° 51' W. (Station 348); lat. 9° 9' N., long. 16° 41' W. (Station 351) ; lat. 5° 45' S., 

 long. 14° 25' W. (Station 345) ; off south coast of Papua ; in Mid-Atlantic, August 23, 

 1S73, and in Mid-Pacific, September 1, 1875. 



The characters of this species are so peculiar as to make it quite unmistakable 

 amongst the known forms of Saphirina. The quite abnormal posterior antennae and 

 caudal lamellae are of themselves sufficient, but the lancet-shaped spines of the swimming 

 feet, and the unusually long setae of the anterior antennae are valuable subsidiary characters. 



10. Saphirina sinuicauda, n. sp. (PI. XLIX. figs. 7-10). 



The female has a five-segmented abdomen (fig. 9), the first and last segments being 

 small, with rounded angles ; the second, third, and fourth lunate ; caudal segments ovate, 

 as long as the last four segments, broad at the base and tapered at the apex ; inner angle 

 strongly toothed, and deeply excavated behind the tooth ; setae very short and slender ; 

 posterior antenna slender, finger as long as the second joint ; branches of the fourth pair 

 of feet equal in length ; conspicilla contiguous. The male has the abdominal segments 

 (fig. 10) almost straight, and their posterior lateral angles very faintly mucronate; the 

 inner branch of the second (?) swimming foot (fig. S) is armed at the apex with several 

 strong, curved spines, the innermost forming a hook ; caudal lamellae almost exactly as in 

 the female. 



Two specimens only of this species have been observed, both from the Philippine 

 Islands. The characters of the caudal appendages seem to separate it quite conclusively 

 from any other described species, nor have I seen elsewhere in this genus any structure 



(ZOOL. CHATX. EXP. — PART XXIII. — 1883.) Z 17 



