202 AßT. 7. T. IJIMA : HEXACTINELLTDA, lY. 



on the dermal and subdermal trabecule as well as on those 

 aronnd the Inmen of the larger incurrent canals, bnt none in any 

 part of the trabecular system of the excurrent side. 



STAUROCALYPTUS MICROCHETUS ^ It. 



PI VIII., figs. 17-20. 

 iSiavrocalypius microchetvs. I.tima, '98, p. 58. 



The single type-specimen of this species (S. C, M. No. 450) 

 is from Outside Okinose l)y the Iwado-line (about 572 m. depth). 

 It is attached to a piece of rust-colored, easily breakable tuff. 



The body represents a rather thin-walled, laterally compressed 

 tube, gently and slight!}^ outbulged between the two ends (see 

 PL VIII., fig. 17). It is attached at the lower end by a 

 tubercular base and also by an accessory base a short distance 

 above the first. Total height of the specimen, 95 mm. Breadth 

 at the middle, 37 mm. l)y 23 mm. Thickness of wall in that 

 region, 3 mm. The simple-edged, wavy oscular i im is directed 

 straight upwards. 



A veil covers the entire external surfoce. It is by no means 

 conspicuous, because the pentactinic spicules composing it are very 

 small and project only about 1 mm. or less beyond the smooth 

 dermal surface. Here and there a few, short and very fine 

 needles are seen standijig out from the extei'n;d sui-face in the 

 manner of diactinic prostalia, which probably they really are. 



* iJiv-poi:, and ö/etO!: canal. 



