STAUKOCALYPTUS ENTACANTHUS. 195 



Two views of it Iiave already been published iii my Coutributiou 

 III., PL VI., figs. 9 and 10. Appended to tliem will be found 

 the name of S. japou'waa, an appellation which I beg herewith 

 to withdraw. 



The specimen is the upper portion of a thick-walled and 

 probably tubular or cylindrical individual. It is about 62 mm. 

 long by 42 mm. diameter ; the wall is 9 mm. thick in the thickest 

 part. While the gastral cavity is nearly cylindrical throughout, 

 the external surface curves in at the top forming a rather thick 

 oscular edge. The osculum is irregularly roundish with a diameter 

 of 22-24 mm. I presume that pentactinic prostalia in tufts, were 

 originally present but have been lost by breakage, for there exist 

 stumps of what a])pear to be their shafts arising in association 

 with small papilla-like prominences of the dermal surface, which 

 is on the whole tolerably smooth. The said prominences occur 

 on the average at intervals of about 3 mm. Of diactinic prostalia 

 some remnants seem to be represented by a few, fine and isolatedly 

 projecting needles. The apertures of the larger incurrent canals 

 reach up to nearly 2 mm. in diameter ; those of an approximately 

 similar size are separated from one another by an interspace 

 usually wider than their own diameter. Over this interspace the 

 thin and delicate ectosomal layer is closely adherent to the 

 choanosome. 



The endosomal layer, closely similar to that of the type- 

 specimen {i.e., consisting of a small and irregularly meshed lattice- 

 work, in which the meshes are not filled in by a dermal laceW'Ork 

 but remain open), is well differentiated over the entire gastral 

 surface. Accordingly, no excurrent canals can be said to ojien 

 freely and directly into the gastral cavity. Not only in this 

 respect does there exist an agreement wdtli the type-specimen 



