PLATE VI. 



FIG. 



1. PODOCORYNE AREOLATA, p. 32, on Naticu Alderi, nat. 



size. 



1 a. The same, highly magnified. 1 b. The gonozooid, 



magnified. 1 c. A portion of the spinous crust, 

 magnified. After Alder. 



2. CORYNOPSIS ALDERI, p. 34, polypites magnified. 



2 a. The goiiozooid. 2 b. The mamibriiim, showing the 



oral tentacles. 2 c. One of the bulbs, bearing the 

 ocelli and marginal tentacles. After figures by 

 G. Hodge, Esq. 



