PLATE VI. 



PAGE 



Fig. 1. Pachychaliva elongata ; natural size, . . . . .23 



Fig. 2. Pachychalina (?*) 'punctata, osculum-bearing surface ; natural size, . 24 



Fig. '2a. Upper portion of surface without oscula ; natural size. 



Fig. '2h. Porlion of osculum-bearing surface ; o, oscula ; p, pores (?) ; x 4. 



Fig. 2c. Portion of surface without oscula ; p, pores {Vj ; x 4. 



