NOTE. 



The following new species are described herein : 



Hadrophyllum woodi : p. 129. 

 Monotrypa amplectens : p. 137. 

 Habrocrinns pentadactylus : p. 143. 

 Platyostoma lineata, var. ; emarginata : p. 274. 



The following illustrations are original : 



Figures 1, 5, 8, 10, IOC, 11, 15, 16, 17, 18, 22-25, 27-30, 32, 66, 78, 81, 84, 

 85, 89, 90, 104, 122> UU 151, 168, 200A, 218, 228a, 261. Those printed in 

 italics were drawn by Miss Elvira Wood, Instructor in Palaeontology in the Massa- 

 chusetts Institute of Technology. The remainder were drawn by the author, 

 except Fig. 228a, which was drawn by Mr. John A. Hutchinson. The other pen- 

 and-ink drawings are copies by Miss Wood (Figs. 10A-10C, 15, 1G, 77A, 124, 

 126, 128, 182A, 198, 207, 210-212, 215, 217, 219, 225C, 229, 230, 232, 233, 236- 

 260, 262, 263) ; by Mr. Hutchinson (Figs. 52, 64, 65, 66A, 68-72, 74, 194-197, 

 199, 200, 201-206, 208, 209, 214, 214A, 216, 220, 225B, 226 228, 231, 234, 235); 

 by the author, and by others. The source is in each case credited as follows : 

 "after Hall," " after Clarke," etc. The illustrations marked "from Hall," etc., 

 were reproduced directly from the lithographs. 



