PLATE IV. 



PAGE 



Fig. 1. Pachychalina melior ; natural size, ..... 20 



Fig. 2. Pachychalina /ragilis ; natural size, • .... 20 



Fig. 2a. PachychaKna fragilis ; natural size. 



Fig. 3. Pachychalina fibrosa (Bahia (? or Bermuda)); natural size, . . 21 



Fig. 4. Pachychalina ^brosa, var. (Station 208); natural size, . . .22 



