ON CTEXOPIIORES OF THE NEIGHBOURHOOD OF MISAKI. 459 



not divided into two wings as was said to be by some authors. 

 Auricules are roughly cylindrical ; their distal end falls usually some- 

 what short of the margin of mouth, probably never reaching beyond it. 

 The pharynx is very long, occupying nearly 4/5 the height of body, 

 and is strongly constricted at a point about 3/5 the pharyngeal length 

 from mouth. Pharyngeal folds present at aboral end of pharyngeal 

 wall as a pair of transverse semilunar areas of a whitish colour. The 

 meridional canals are provided with lateral branches, which occur not 

 only in the parts beyond the oral end of subpharyngeal ribs but also 

 in those parts which underlie ribs, subpharyngeal as well as subtenta- 

 cular. As a rule, a branch occurs on either side below each comb-plate. 

 All these branches are thin and very delicate, showing only a few 

 furcations in their course. The branches departing from subpharyngeal 

 canals in the parts not covered by the rib, are much better developed 

 than those more superiorly situated, and are more conspicuous on account 

 of the milky colour of the genital element lodged in them. In all the 

 individuals examined, the branches in question showed considerable 

 difference both in length and breadth on the two sides of the canal, 

 being much longer and broader on perradial than on interradial side. 

 The winding of lappet canals as well as of the branches of pharyngeal 

 canals are highly complicated as shown in the figure. A diversity of 

 opinion prevails among the previous authors concerning the presence or 

 absence of the tentacle apparatus in Ocyropsis. MOSER stood for its 

 presence (1908, p. 66), but this fact was denied by MAYER (19 12, 

 p. 40) ; whereas, FEWKS has given a rather ambiguous statement that, 

 "the tentacles, if present, are short and inconspicuous" ( 188 1 , p. 138). 

 The result of my examination stands in confirmation of MoSER's view. 

 The tentacle apparatus is certainly very small and inconspicuous for 

 the size of the animal ; nevertheless, its presence can be ascertained 

 without difficulty with the naked eye. It is situated a little below 

 the level of the constricted point of the pharynx, presenting itself as a 

 tiny knob-like body, connected as usual with the infundibulum by the 



