90 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXV. 



primary cords pass diagonally upward, through canals formed by 

 corresponding grooves on the apposed sides of the infrabasals (figs. 

 5 and 6) (thus passing between the infrabasals), emerging exteriorly 

 near the ventral surface of the ring of infrabasals (fig. 7), and im- 

 mediately passing into the basals, through a single opening (fig. 8) ; 



Fig. 11. — Dorsal (proxi- 

 mal) VIEW OF A RADIAL, 

 SHOWING THE TWO APER- 

 TURES BY WHICH THE 

 CANALS ENTER FROM TWO 

 ADJACENT BASALS, AND 

 THE TWO APERTURES BY 

 WHICH THE CIRCULAR 

 COMMISSURE LEAVES 

 THE RADIAL. 



Fig. 12. — The same ra- 

 dial GROUND DOWN TO A 

 PLANE PASSING THROUGH 

 ALL THE APERTURES, 

 SHOWING THE COURSE 

 OF THE CANALS WITHIN 

 THE RADIAL. 



w 



FlG. 13. A DIRECT (NOT 



FORESHORTENED ) VIEW 

 OF THE GROUND SUR- 

 FACE OF THE SAME 

 RADIAL. 



within the basals the cords immediately fork (fig. 9) , the two divisions 

 diverging, and appearing on the ventral (distal) surface of the 

 basals on each side of the median line, equidistant between the median 

 line and the outer edge (fig. 10) ; a transverse connective (fig. 9) con- 

 nects the two divisions of the primary cord just before they emerge 

 on the ventral (distal) surface; entering the radials through two holes 

 in the dorsal (proximal) surface (fig. 11) (which receive cords from 



Fig. 14. — A basal of En- 



DOXOCRINUS PARR.E 

 VIEWED FROM THE INTE- 

 RIOR OF THE CALYX, SHOW- 

 ING THE TWO APERTURES 

 BY WHICH THE BRANCHES 

 OF THE PRIMARY CORD EN- 

 TER THE BASAL, AND THE 

 TWO APERTURES BY WHICH 

 THEY LEAVE THE BASAL 

 AND ENTER TWO ADJACENT 

 RADIALS ; THE COURSE OF 

 THE CANALS WITHIN THE 

 BASAL IS INDICATED BY 

 DOTTED LINES. 



Fig. 15. — Diagram showing the 

 course of the canal in exdoxo- 

 crinus parr.e. 



two adjacent basals) the cords run almost parallel (figs. 12 and 13), 

 then converge, coming together just within the distal surface of the 

 radial; from the point where the two cords join a cord is given off on 

 either side which passes through into the adjacent radials, forming a 



