PLATE I. 



UiNTACRiNus sociALis Grin. 



Specimens drawn from Slab No. VIII ; reduced to about .25 natural size. To 

 show the length of arms, and relative proportions of calyx, arms, and bra- 

 chials in adult and young individuals. 



VIII (/ has the longest arms yet found preserved, the longest being 40 inches, or 

 100 cm. It was evidently about 25 cm. longer, or about 125 cm. in all. 



The small specimen, VIII h, has arms about 30 cm. long, with a probable addi- 

 tional length sufficient to make them 55 cm. 



VIII c and d are large specimens overlying some of the arms of a. 



