STAIIROCALYFTLTS AFFINIS. ISo 



of coarse strands, running more or less parallel to the surfaces 

 but otherwise in all directions (PL XTIL, fig. 1). Especially 

 coarse is its appearance on the external side of the wall. Picked 

 up ])j means of a pincette the strands easily come off in strips 

 often as long as 40 or üO mm. At the torn edge of the wall 

 the fibers bristle out in a conspicuous mannei-. 



The second specimen (S. C. ]\r. No. 400, shown in PI. XIV., 

 fig. 14) was obtained by Ktma in the Uraga Channel (Nago 

 Hill-e-])aibusa Spit and about 4 kilom. off the latter). It resembles 

 a tube which laterally is slightly and irregularly compressed. It 

 is 103 mm. long, 24-27 mm. l)road in the middle and considerably 

 broadened at the lower end. At one corner of the latter there 

 is a small stalk-like base for attachment. At the opposite corner 

 the wall is outbulged and thinned out at the top, apparently in 

 the first stage of the breaking through of a secondary osculum. 

 It is to be noticed that both this outbuloins; and the attachment 

 base lie in the sagittal plane of the body, as is the rule with so 

 many other Acanthascinic with similar parts. The upper truncated 

 end of the body is taken up by an oval-shaped osculum. The 

 wnll is about G mm. thick in the inferior part, gradually 1)ecom- 

 ins; thinner towards the oscular eds-e. 



From all over the external surface, except near the basal 

 stalk, there arise both oxydiactinic and oxypentactinic prostalia 

 lateralia. The prostat diactins are not ver}' luunerous ; they are 

 long needles that spring out isolatedly to a length of 30 mm. or 

 less, directed obliquely outwards and upwards. In the upper part 

 of the body they are finer and much shorter than those situated lower 

 down. Along the oscular edge they project straight upwards, the 

 exposed portion not exceeding 4 mm. in length. — The large prostat 



