REPORT OF THE DIRECTOR I9IO 209 



and at the right of the main portion preserved. On receiving 

 permission from Doctor Whiteaves to uncover a portion of the 

 specimen in this region three additional rings were found within 

 the cup formed by the strongly bent-in edges of the radials. It 

 will be seen from the figure that these occupy the right-hand side 

 of the cavity and that the end of the longer portion of the stem 

 was thrust to the left-hand side. Figure 2 of this plate shows 

 the upper portion of the stem photographed through a gum 

 dammar mounting with a 3-inch objective and given an amplifi- 

 cation of 10. The outlines of the basal and of the stem lumen 

 are clearly seen in the upper part of the figure. It will also be 

 noticed that the plates of the stem have been displaced, those 

 just above the center of the figure having been shifted to the 

 left. There are no plate edges connecting these basals with the 

 radials. It seems evident that the stem was thrust up into the 

 body cavity and that the basals parted from the radials. When 

 the cap of basals met the inner edges of the hydrospires, the 

 advance of the stem was stopped. Continued pressure bent it 

 into something of a letter S form (a portion of which lies in the 

 vertical plane passing from front to rear), displaced its joints 

 above, severed the stem about the middle of the basal invagina- 

 tion of the theca or just where the lack of lateral support might 

 cause the break, and pressed the broken end of the balance of 

 the stem as far into the same cavity as its walls would allow. 

 The original depth of this basal invagination was about half 

 that assigned to it by Billings. The radials themselves show 

 evidence of crushing and the type has suffered some distortion. 

 Some of the details noted would seem to indicate that the form was 

 monocyclic. 



Plate 4, figure 3, presents a small area of the right-hand 

 side of figure i, xio. We may here again see the closed inner 

 edges of the hydrospires which have so weathered above as to reveal 

 their two-walled character. It is to be regretted that the type shows 

 none of the plates of the peristome. The question as to whether the 

 deltoids are true orals or not must for the present be left open. The 

 visible apexes of the deltoids of the Valcour island specimen are 

 arranged in a circle having a diameter of about 10 mm. The 

 fringe of brachioles and the apical piece completely cover this area, 

 yet within this circle a number of plates might be concealed and here 

 also is the mouth, the anus, and the genital pore or pores. 



One interambulacral area seems to have been freed from the 

 matrix by the use of a knife or file. In the process a portion of the 



