806 THE VOYAGE OF H.M.S. CHALLENGER. 



Genus Cardenio, n. gen. 



Upper Antennas shorter than the lower ; the first joint not apically clubbed, the 

 third joint not shorter than the second of the peduncle or the first of the flagellum. 



Third joint of the mandibular palp short, but not rudimentary. 



MaxiUipeds. — The fourth joint absent or rudimentary. 



The finger rudimentary in the first gnathopods, absent from the second gnathopods, 

 the first, second, and fifth perssopods, short and blunt in the third and fourth perseopods. 



Telsoh long, deeply cleft. 



The generic name is taken from a character in Don Quixote. 



The genus is allied to Bathyporeia, Lindstrom, by the character of the limbs, the 

 gnathopods also showing a resemblance to those of Synopia, Dana. 



Cardenio paurodactylus, n. sp. (PI. LIIL). 



The head projecting over the antennae in what from above or from the side appears 

 to be a rounded point, but in front appears to be truncate ; the head dorsally as long as 

 the first two segments of the perseon ; the back rounded, widening to the centre of the 

 perseon, and then narrowing ; the hind I'im of the pleon-segments more or less crenate 

 or dentate across the centre of the back ; the postero-lateral angles of the first two 

 rounded, of the third acute ; the fourth, fifth, and sixth segments not very short. 



Eyes small, reniform, set near the front of the head, near together, forming an 

 angle one with the other, dark in the spirit-specimen, with the ocelli numerous, more 

 than sixty in number. 



Upper Antemiie. — Peduncle of three short joints, the first a little longer than the 

 third, both than the second, which is intermediate in thickness ; flagellum four-jointed, 

 equal in length to the second and third joints of the peduncle, with a pair of stou1» 

 cylinders on each of the first and second joints ; the secondary flagellum with one long 

 joint and a minute second one, the two together not equalling the first of the primary, 

 which itself is longer than the second of the primary, but shorter than any of the joints 

 of the peduncle. In one specimen the accessory flagellum had an additional joint. 



Lower Antennw. — First and second joints short and small, gland-cone not produced; 

 third joint as long as the two preceding combined, fourth joint stouter but a little 

 shorter than the fifth ; third, fourth, and fifth armed to some extent with spines ; 

 flagellum slender, five-jointed, the first joint the longest. In one specimen the 

 flagellum was seven-jointed. 



Upper Lip. — Both plates broad and thin, squarely rounded distally, the outer 

 advanced a good deal beyond the inner, its distal margin smootli in the centre, with a 

 group of cilia on either side. 



