EXPLANATION OF PLATES. 145 



PLATE iv. 



Fig. 1. Head of the hydroid Syncoryne rosaria (A. Ag.). 

 Showing budding medusae among the tentacles. The figure is 

 taken from one of the life-size specimens shown in fig. 4. 



Fig. 2. Hydroid Atractyloides formosa sp. nov. The ten- 

 tacles are half retracted. External wall covered with algae. 

 This figure is an enlarged view of one of the following. 



Fig. 3. Cluster of the last-mentioned hydroid (life-size). 



Fig. 4. Cluster of S. rosaria (life-size). 



Fig. 5. Male capsule of Atractyloides. These clusters are 

 found at the base of the hydranth stem arising from the branch- 

 ing basal tubes and not from the stem of the hydroid. The cen- 

 tral dark body is the spadix, from the left-hand side of which 

 a curved body, " spermatic mass" ? is seen in process of forma- 

 tion. 



Fig. 6. Very young Polyorchis before the lateral branches 

 of the radial tubes form. 



Fig. 7. Adult Polyorchis penicillata A. Ag. 



Fig. 8. Microcampana cornea, gen et sp. nov. 



PLATE v. 



Fig. 1. Pelagia panopyra. Size reduced. 

 Fig. 2. Aurelia sp. incog. ; possibly A. labiata. 

 Fig. 3. Willia occidentalis sp. nov. 



PLATE vi. 



Fig. 1. Idmonea sp. nov. 



Fig. 2. Chiorcea leontina Gould. From a drawing of a 

 specimen taken by A. Agassiz at Port Townsend, W. T., in 

 1859. 



Fig. 3. Anemonia Stimpsonii sp. nov. The tentacles are 

 half retracted. 



Fig. 4. The same with tentacles more retracted. 



Fig. 5. Bunodes Californica sp. nov. The Actinian is rep- 



