252 K. NAKAZAWA 



Locality. Near Enoshima in Sagami Bay. 



Notes. — A characteristic point of this species lies in the armature of telson 



Anisomysis Hansen, 1910. 



The genus was recently established by Dr. Hansen in " The 

 Scbizopoda of the Siboga Expedition " for the single species A. laticauda- 

 In my material there are two species which are referable to that 

 genus. Both the species have the posterior margin of telson entire, 

 instead of showing a deep median incision as docs Hansen's species. The 

 generic diagnosis needs amendment in relation to this point only. 



6. Anisomysis ijimai n. sp. 

 Plate VIII., figs. 5, 14, 27, 33. 



Diagnosis. Carapace with obtuse rostrum. Eye remarkably 



large. Antennular peduncle stout, its third joint much shorter than 

 basal joint. Antennal scale 7-8 times as long as broad ; antennal 

 peduncle composed of three short and nearly equal joints. The three 

 pairs of flagella greatly differ in length according to sex ; the two 

 flagella of antennule more than twice longer in male than in female. 

 Labrum truncate anteriorly. Mandibular palp (fig. 14) with a peculiar 

 middle joint provided with a row of 7 or 8 short knobs on the inner 

 side, comparable to the serration of the same part in Lycoinysis 

 spiniemtda Hansen. Posterior six pairs of legs rather short, armed 

 with a sparse number of spines ; the propodite divided into two joints 

 near distal end. Fourth pleopod of male (fig. 27) with the outer 

 branch reaching to middle of telson ; distal two joints of the outer branch 

 nearly equal in length, the terminal joint provided with two spines 

 just as in A. laticatida Hansen. Telson (fig. 33) about two-thirds of 

 the last abdominal segment in length, distinctly constricted in the 

 posterior parts, the portion behind that constriction being represented 

 by a round plate fringed with about 18 spines. Inner branch of 



