500 University of Kansas Geological Survey. 



Squama siyissa Logan. Plate ex, fig. 3. 



Squama sx>issa Logan, 1897, Kans. Univ. Quart., vol. vi, No. 4, Oct., series A, 

 p. 187. 



Description : Capitulum composed of twelve plates, viz. : 

 Carina, terga (2), scuta (2), rostrum, subrostrum, subcarina, 

 superior laterals (2), and carino-laterals (2). Height of ca- 

 pitulum from base to tip, nineteen mm. ; width (lateral) from 

 carina to subrostrum, seventeen! mm. Carina long, narrow, 

 somewhat shield-shaped, and slightly convex ; length, five mm. ; 

 maximum breadth, two mm., overlapping lateral in specimen. 

 Terga triangular, with apex pointing toward base of ca- 

 pitulum, and base somewhat rounded ; very slightly convex, 

 smooth; length, ten mm.; breadth (maximum), fifteen mm., 

 joined closely with laterals in one specimen. Scuta large, 

 convex, in general shape triangular ; superior border almost 

 straight ; rostral border convex, base smooth, slightly concave ; 

 length, ten mm. ; maximum breadth, seven mm., adhering 

 closely to superior lateral and overlapped by rostrum. Ros- 

 trum club-shaped, slightly convex; length, six mm. ; breadth, 

 two mm.- Subrostrum with the same characteristics as ros- 

 trum, except that it is smaller. Carino-laterals long, trian- 

 gular, with apex distal, smooth ; length, ten mm. ; maximum 

 breadth, four mm. Superior laterals shorter, three mm. ; 

 otherwise much the same as carino-laterals. Peduncle short, 

 composed of seven rows of plates ; plates oblong, narrow, over- 

 lapping, short; maximum breadth, six mm. 



The type specimen was collected from the base of the Or- 

 nithostoma beds by the writer, in the northern part of Jewell 

 county. A group of these forms were found adhering to a 

 fragment of a shell of Inoceramus. 



Squama lata Logan. Plate ex, fig. 4. 



Squama lata Logan, 1897, Kans. Univ. Quart., vol. vi, No. 4, Oct., series A, 

 p. 188. 



Description : Capitulum composed of ten plates, viz. : Carina, 

 terga (2), scuta (2), subcarina, superior laterals (2), carino-lat- 

 erals (2) ; height, eight mm. ; width, sixteen mm. Carina long, 



