KHAEDOCALYPTÜS CAPILLATUS. 



279 



men there is a large cicatrice- like patch where the wall is very thin, 

 probably the result of the healing of an injury received there. 



The annexed text- figure 11 represents 

 another large specimen which belonged to 

 Mr. Alan Owston (O. C. No. 102). The 

 shape is that of a spindle-like vase, stand- 

 ing erect and but little compressed laterally. 

 Height, 210 mm. Breadth, 72-79 mm. in 

 the middle. Thickness of wall in the 

 broadest part, 7-16 mm. The irregularly 

 shaped osculum at the narrowed upper end 

 is 3»5 mm. long and about 20 mm. broad. 

 The body likewise narrows below but some- 

 what expands again at the very base. 



In all the larger sj)ecimens, the dis- 

 tribution of diactinic prostalia is confined 

 to the oscular edge and to a narrow zone 

 along it. I presume that in this species, 

 as in R. victo7' and Staurocalyptus glaher, 

 the early formed diactinic prostalia of the young are cast off and 

 thus become lost during growth, though new spicules of the same 

 kind continue to be produced in the growing parts, /. e., in the 

 oscular marghi. Here the spicules spring out either singly or in 

 small tufts. In the latter case they generali}^ arise from the apex 

 of small dermal elevations, the same as those which, lower down 

 in the body, bear the tufts of pentactinic prostalia. The mar- 

 ginalia project generally straight upwards to a length of 7-12 mm. 

 and taken together may form a bristly wall around the oscular 

 opening. The secondarily formed osculum is provided with none 

 or at most wâth only a few of such marginalia. 



Texl-fig. 11. — Rhabdocalyp- 

 tus capillahis. J natural 

 size. 



