454 



TAKU KOMAI : 



between the two. The specific identity of the Japanese form with H. 

 fusiformi? (originally named Lampetia fusiformis) of A. Agassiz and 

 Mayer, which was described from the Eastern Pacific, seems to be 

 nearly certain, especially since the larger examples of the former tend 

 to be of a relatively more slender shape than the smaller and thus 

 approach the latter form. 



Genus Bolinopsis, L. Agassiz. 

 {Bolina, Mertens.) 

 2. Bolinopsis mikado (Moser) (Pl. VII, fig. 2). 



Bolina mikado, Moser, 1907, p. 451. — Moser, 1908, p. 56, Pl. ii, fig. 1, 



The body is ovoid, moderately compressed ; at the level of the 

 base of lappets, the tentacular axis is about 2/3 the length of pharyn- 

 geal axis and about 1/2 that of body proper. The body narrows 

 gradually towards the rounded aboral extremity. The lappets are. of 

 medium size and usually occupy a little more than half of the entire 

 body-length. The auricles in full-grown animals are 1/3-1/2 as long as 

 the length of body proper, their end reaching somewhat beyond the 

 margin of mouth. The deeply sunken aboral sense-organ is situated at 

 the bottom of a cleft which is 1/5 as deep as the length of body 

 proper. The comb-plates of the ribs begin to exist at the apical end 

 of meridional canals ; the last comb-plate of subtentacular ribs lies at 

 base of auricles, that of subpharyngeal ribs close to lappet margin. 

 The pharynx is long and nearly half as long as the total length of 

 body including lappets. The pharyngeal folds are 1/4-1/3 as long as 

 the pharynx. The interradial canals divide at the level of the sense- 

 organ into the adradial canals which run alongside the wall of the 

 aboral cleft. The lappet-canals make some winding which is rather 

 simple and resembles the condition represented by BlGELOW for Boli- 

 nopsis vitrea (1912, p. 391). The tentacles are small and inconspicuous. 



