Plate XX; Figs. 208 lo 221: Magxified 500 Diameters. 



Fig. 208. Cyclidium. a, b and c are different forms 



of perhaps the same species p. 51 



Fig. 209. Cyclidiiiin limctosiiiii Stokes p. 51 



Fig. 210. Urocentnnu turbo MiiH p. 51 



Figs. 211 to 215 are (Hffcrent varieties referred to 



tlie genns Pleiiroiiciiia p. 50 



Fig. 216. Blcpliarisiiia sp. ( ?) p. 54 



Fig. 217. BIcpharisuia nndida>is Stein p. 54 



Fig. 218. HlepJiarisiua ovata. (Api^aria orata of 



Stokes ) p. 54 



Fig. 219. Bahmtidiiini coli ( ?) C. & L p. 36 



Fig. 220. Condylostoma ( ?) p. 54 



Fig. 221. Opiiryglena sp. (?) 1). 47 



