122 WELLER. 



the two preceding species in having, simply, more or less strongly- 

 convex plates in the dorsal cup, instead of the great nodose plates 

 of those species. Both the typical form and the variety agree 

 with M. subglohosiis in the arrangement of the plates in the pos- 

 terior interradius, but in general form the species more closely 

 resembles M. iiodosus and its variety spmosiis. 



Melocrinus milwaukensis var. rotundus n. var. 



(PI. XIV. Fig. 4.) 



This variety differs from the typical form in being shorter, 

 with more convex plates, in the basals being more strongly 

 nodose, and in the more convex subhemispherical vault. 



Pentremitidea filosa Whiteaves (?) 

 (PL XIV, Fig. 3.) 



1889. Pentremitidea filosa Whiteaves, Cont. Can. Pal., Vol. 



I, p. 104, PI. 14, Figs. i-ib. 



Body small, proportion of width to height as 3 to 5. Maxi- 

 mum breadth at or near the base of the radial sinus. Lateral 

 outline subovate, but conical at the base and truncated at the 

 apex ; cross section at part of maximum width, decagonal, the 

 sides of the decagon represented by the ambulacral areas, short 

 and concave, the other sides nearly straight or slightly concave. 



Basal plates three, two pentagonal and larger than the third, 

 which is quadrangular ; about one-fourth as high as the radials. 

 Basal cup strongly trihedral, about as high as wide, and reach- 

 ing more than half way to the bases of the radial sinuses. 

 Radial plates lanceolate in outline, nearly three times as high as 

 wide ; the bodies or undivided portions spread outward more 

 rapidly than the basals, and occupy one-fourth of the total length 

 of the plates. The apices of each of the two adjacent radials are 

 united to form an acute point which projects a little above the 

 summit. Radial sinuses deep, the sides elevated and forming 

 sharp edges, the portion bounding the base of the sinus more 



