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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 54. 



straight, gradually tapering, sharply pointed, 130-260[/, long and 

 .12-32/x thick at base. Paired rays longer than basal ray, gently 

 curved forwards and gradually tapering to sharp point, 170-370/* 

 long and 16-32/x thick at base. 



Quadriradiates of the larger exhalant canals (d) similar to the 

 above triradiates, except in the presence of short and slightly curved 

 apical ray. Basal ray -140-270/* long and 20-30/a thick at base. 

 Paired rays 230-330/t long and 20-32/* thick. Apical ray about 60/* 

 long and 16-20/x thick at base. 



Fig. 8. — Leucandea poculiformis. a, dermal triradiates. h, triradiates of cham- 

 ber LAYER. C, TRIRADIATES OF THE LARGER EXHALANT CANAL. d, QUADRIRADIATES OF 

 THE LARGER EXHALANT CANAL. 6, GASTRAL TRIRADIATES. f, GASTRAL QUADRIRADIATE. 

 g, DERMAL MICROXEA. Or-f, X 100 ; ff, X 400. 



The larger gastral triradiates regular or subregular, nearly similar 

 to those of dermal skeleton and of chamber layer. 



The smaller gastral triradiates (e) strongly sagittal. All rays 

 equally thick, sharply pointed. Basal ray nearly straight, distinctly 

 shorter than paired rays, 80-120/* long and 16-20/* thick at base, 

 lying slightly out of the plane of paired rays. These are nearly 

 straight or slightly curved, very strongly divergent, 120-200/* long 

 and 16-20/* thick at base. 



Gastral quadriradiates (/) exactly similar to gastral triradiates, 

 but with a short apical ray. Basal ray 90-110/* long and about 20/* 



