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PROCEEDINGS OP THE NATIONAL MUSEUM 



TOL. 81 



spicules are straight and taper perceptibly toward both ends. The 

 outer and inner ends are acutely or bluntly pointed, the entire surface 

 being smooth and not beset with microtubercles. 



Comitalia are slender diactins, measuring 20/*, with a smooth 

 surface, except at both ends, where they are roughened by micro- 

 tubercles. They are broad at the middle and nearly as long as half 

 of the entire length of the prostal diactins. 



FiGDRB 13. — Staurocalyptus rugocruoiatus, new species : a, Gastral hexactin ; t, dermal 

 pentactin ; c, oxyhexaster ; d, e, hemihexactinlc forms ; j, g, hexactinic forms ; h, clis- 

 coctaster. All x 250 + 



The parenchymalia are composed of large and small oxydiactins, 

 either nearly straight or gently bent in a bowlike manner. They 

 may attain 5 mm in length and ITO/t in breadth at the middle. The 

 ends are usually prominently microspined in varying degrees. In 

 some of these diactins, one end is slightly rounded, but most of them 

 are acutely pointed at both ends. The smaller diactinic parenchy- 

 malia with 2 or 4 Imobs at the middle and 300/x to 400/i, in length, 



