FOSSILS OF THE BrELlXGTOK GEOUP. 421 



Locality and position Tipper division of the Burlington group, at Bur- 

 lington, Iowa. Lower Carboniferous. Xo. 298 of Mr. WACHSMUTH'S 

 collection. 



ScAPHiocRiNTrs SCALARIS, M. and W. 



PI. 2, Fig. 10. 

 Scaphiocrimit gcalaris, MEEK and WORTHEX. Proceed. A.cad. Nat. Sci., Phila., 18<59, p. 145. 



BODY small, somewhat cup-shaped, being broad below, 

 and a little expanded above; about twice as wide as high 

 at the top of the first ra dials. Base small and hidden by 

 the column in the concavity of the under side. Subradial 

 pieces tumid, wider than high, and arranged so that the 

 body rests upon them, when placed on a plane surface with 

 the column removed ; all appearing as if pentagonal, ex- 

 cepting the two on the anal side, which seem to be hexago- 

 nal, but they must all have each an additional obtuse angle 

 at the middle of the under side. First radials about of the 

 same size as the subradials, wider than long, and pentago- 

 nal in form, though one on the anal side has one side so 

 short as to appear as if quadrangular ; each a little ex- 

 panded above, so as to present, with the broad excavations 

 at their inferior lateral angles, a more or less constricted 

 appearance. Second radials smaller than the first, rounded 

 on the outer side, and a little constricted on the lateral 

 margins, all wider than long, with a quadrangular outline. 

 Third radial pieces, in all but the anterior ray, nearly as 

 large as the first, but proportionally longer, rounded on the 

 outer side, constricted in the middle, and pentagonal in 

 form; the superior lateral sloping sides of each supporting 

 an arm. In the anterior ray the third piece is narrow and 

 long, truncated above, and merely supports a single arm. 



First anal piece smaller than the subradials, pentagonal 

 in form, and resting between the upper sloping sides of the 

 two hexagonal subradials; connecting on the left with the 

 second anal, and on the right with a first radial, while it 



