250 



K. NAKAZAWA : 



Locality. Misaki, 10-20 fathoms. 



Notes. — This species resembles /V. ii?/iriicana in the spinulatiotl of telson, but the latter 

 species has roundel rostrum and shorter antcnnal seale. It also resembles A', mirabili s 

 in the shape of telson, but in this species the lateral spines of telson are all of a 

 uniform size, while the propodites are more numerously segmented than in the present 

 species. 



Metamysis n. gen. 



Antcnnal scale slender, obliquely truncate at apex, setose on both 

 margins, jointed at the second serration from apex. Labrum pointed 

 anteriorly. Posterior 6 pairs of legs with multiarticulatcd propodite ; 

 mcropoditc longer than carpopodite and very stout. Telson elongate, 

 linguiform ; apex entire, provided with several uniform spines. In 

 male, fourth pleopod composed of a short basal joint, an inner branch 

 of one joint and an outer branch of two joints ; the latter with two 

 long terminal filaments ; other pleopods rudimentary. Marsupium 

 composed of two pairs of lamellae springing from bases of the posterior 

 two pairs of thoracic limbs. 



4. Metamysis mitsukurii n. gen. & n. sp. 



Plate VIII., figs. 9, II, 13, 18, 26. 



Diagnosis.' Carapace with pointed rostrum. Anterior three 



abdominal segments with 2 or 3 transverse grooves on each ; fourth and 

 fifth segments armed with 3, and the last segment with 7, rows of 

 spinules (fig. 9). Antenriular peduncle stronger in male than in female. 

 Antcnnal scale extending scarcely beyond antcnnular peduncle, about 

 six times as long as broad (fig. 11). Labrum with an acute anterior 

 projection reaching the end of the middle joint of mandibular palp 

 (fig- L3)- Legs rather slender, all propodites made up of 6 joints; 

 basal joint of cxpodite of all thoracic limbs strong and provided 

 with many minute spinules on the outer margin (fig. 18). Fourth 

 pleopod of male (fig. 26) with the outer branch reaching far beyond 



