NOTES ON THE JAPANESE MVOPSIDA. 



591 



third and fourth arms being much larger than any other of the suckers 

 (Pl. XI, fig. I). 



2. Euprymna similis sp. nov. 



PJ. XL, figs. 5-8. 

 Euprymna morsei, Verrill 1881, p. 417, foot note (Yeddo Bay), 

 p.p. ?. 



Diagnosis. Body oblong, rounded behind as usual in the Sepiolida;, 

 and slightly longer than broad, the breadth being equal to about 

 three-fourths the length ; fins subcircular, notched at the anterior 

 attachment to body and slightly longer than half the length of 

 mantle. Mantle joins the head dorsally by a broad ligament, the 

 breadth of which is about equal to the distance from eye to eye. Head 

 a little narrower than body, with slightly prominent eyes. Siphon 

 slenderly conical, nearly extending to the angle between ventral 

 arms ; siphonal clasping apparatus elliptical, with a deep median 

 groove for clasping the linear cartilaginous ridge of mantle. 



Arms rather unequal, the order of length being 2, 3, 4= 1 ; the 

 longest is as long as the mantle ; all are slender and taper gradual- 

 ly towards end ; the carination of their outer surface indistinct. 

 Suckers somewhat spherical with small aperture and slender peduncle, 

 arranged in four series, except a few basal and terminal ones which 

 are in two series ; size of suckers greatly differs in the sexes. In the 

 female they are all equally small, while in the male those of margi- 

 nal series are always larger than those of inner series, and again, 

 those of ventral marginal series are much larger than those belong- 

 ing to dorsal marginal series. The last characterization is especially 

 distinct in the second, third and fourth arms (Pl. XI, fig. 5). Horn)' 

 ring of suckers with entire edges, that in the smaller suckers oval in 

 shape with the long axis transversely directed ; that in the larger 

 ones with the upper and lower margins somewhat projecting forward 

 and beak-like (Pl. XI, fig. 6). 



