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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 81 



Spiculation. — The parenchymalia are mainly diactins, which are 

 as usual of varied dimensions, ranging from filamentous comitalia 

 to principalia of 5 mm or more in length and 10//, in thickness in 

 the middle. The larger diactins are oftener found in the deeper 



Figure 8. — Aulosaccus fissuratiis, new species : a, Gastral hexactin, X 200 ; i, 

 hypodermal oxypentactin, X 200 ; c, dermal pentactin, X 200 ; d, dermal 

 stauractiu, X 200 ; Cj scopiila, X 400 ; f, macrodiscohexaster, X 400 ; g, oxy- 

 hexaster, X 400 ; h, oxyhexaster, X 400 ; i, hemlhexactinic oxyhexaster, X 200 ; 

 /, hexactlnic oxyhexaster, X 200 ; k, microdiscohexaster, X 400 



parts of the body. They are bowlike and of nearly the same breadth 

 throughout, with conically pointed and microtuberculated ends and 

 without central swellings or knobs. The shorter and broader diactins, 

 which are mostly isolated, are smooth at the center or, at most, with 

 an annular swelling there; their ends are always roughened and 

 rounded or conically pointed. 



