284 NEW YORK STATE MUSEUM 



This Species differs from C . r a d i a t u s in its less globular 

 form, the stouter lAx, and the fact that its arms divide above the 

 first free joint. 



Collected by Mr Percy E. Raymond. 



BRACHIOPODA 



Genus schizambon Walcott 



Schizambon duplicimuratus sp. nov. 



Plate 5, figures 6-^ 



Description. Pedicle valve subcircular, well rounded anteriorly, 

 slightly straightened for about 70° on each side of the small and 

 rather clean cut apex; length of shell 5iTim, width 5.4mm; greatest 

 convexity a little to each side of the pedicle opening and raising sur- 

 face* of shell about imm above the plane of the shell margin; apex 

 about .5mm above the cardinal margin and slightly projecting over it. 

 Foramen subovate, about .88mm wide, anterior edge i.8mm from 

 apex, earlier portions filled up leaving a narrow depression with 

 smooth convex floor, narrowing posteriorly and reaching the extreme 

 point of the apex. Surface ornamented with nearly concentric, 

 raised striae which completely encircle the valve; they are single 

 and rather crowded where they cross the cardinal area but are 

 strongly raised and distinctly wider and double over the anterior and 

 lateral regions of the valve. In front of the pedicle opening eight 

 pairs of these striae can be counted in the length of 2.5mm on 

 anterior portion of vertical axis. The spaces between one pair and the 

 next are rather deep and .2mm wide, the distance across each pair 

 is slightly less. The outermost rampart on the double Dortion bears 

 a fringe of short spines set about .12mm apart. 



Brachial valve similarly ornamented but less produced posteriorly 

 along the cardinal margin. 



Observations. This species seems to be a little larger than S . 

 t y p i c a 1 i s Walcott, and to differ from that species in its rela- 

 tively larger pedicle opening, its more nearly spheric or transversely 

 oval outline, and in the prominent and double, not lamellose, striae 

 over the anterior and lateral slopes of the shell surface. 



Described from three specimens, one of them collected by Mr 

 Percy Raymond and kindl)^ sent me for comparison. 



