PLATE X. 



( !ii; vii, I, i A PXtOPLECTU Meek 



i i", i. ,\ small oblique Left valvej one <<i Peek's types (after White)i 



'2. Left valve of ao adult Less oblique example; Peek's tj pe of i> >< nia 



I /■■.< iKiofittra) rkytophora (after White) i 



.".. An ini | mi I re I, r;i..sl. of ;i, loll, \ ;il\ o lolttitllug & p«'i I ioU <>l 1 1 if mIk II, I mm 



Huerfano pai k , < '<>i<>i;i<io. 



N.il, Mum. C.il, lnv.il, I-'onh., '"SVC. 

 I NOCKRAMU8 i a 1.1 \ i u;; Sohloth - - - - 



in;;, i. Sight valve of as elongated specimen (after Mook). (Son IM. xiv, 

 i lg, i.) 



[NOOERAMU8 DZMlDIUfl White. 



Fig, 5. Left valve of a speolmen of average size (after White)i 



<;. I'loni, \ it u showing oonv exits of both valves (after Whito)i 



Pagi 



74 



Ti 





213 



