BY T. GRIFFITH TAYLOR. 



55 



radial sinus. Also on the same piece of stone occurs a second 

 basal plate of the same general shape as that of specimen A. 



There is no trace of a stem, except in so far as a flattening at 

 the distal end of the basal on specimen A may indicate a facet 

 for attachment of a stem. 



Basals. — The two isolated plates, one on each specimen, 

 represent basals. They are both quadrilateral and somewhat 

 wedge-shaped, about 2 cm. long by 1*2 cm. at the widest portion 

 near the adoral extremity. The narrow habit of these basals 

 would seem to point to a narrow funnel-shaped basal cup, unless 

 they both happen to be small unpaired 

 basals from different specimens. Reasons 

 for referring them, however, to a Mas- 

 toid (such as Metablastus) with an elon- 

 gate basal cup will be given later. 

 These plates were very solid, being as 

 much as 3 mm. in thickness near the 

 aboral end. 



Radials very long and narrow, decreas- 

 ing slightly towards the adoral end. 

 Length about 55 cm., with a ratio 

 limbs /body = |> Interradial sutures 

 comparatively straight, placed in depres- 

 sions, sinuses narrow and sublinear, 

 0*3 cm. wide. Width of radials 2-2 cm. 

 near the aboral end, but narrowing to 

 IT cm. at the adoral end. In profile 

 the radials bend sharply just below the 

 radial sinus, and thus give an angle of 

 140° between the upper (or ambulacral 

 portion) and lower (aboral) portion (see fig.2). It will be 

 noticed that the radials are nearly thrice the length of the 

 basals. Each of the radials is rounded from side to side in 

 rather a pronounced manner, which would give the complete calyx 

 a definite broadly fluted appearance. The radials (specimen B) 

 appear to be ornamented by concentric striae. 



Fig.2-Eestoration of Blastoid. 



