864 



MK. E. S. RUSSELL — ENVIRONMENTAL [ Nov. 26, 



Text-fig. 217. Text-fii'. 218. 



Text-fio-. 219. 



Text-fio-. 221. 



Text-fie. 220 



Text-fio'. 222. 



Text-figs. 217-222.— Some irregular outlines, all of exposed shells. 



