PLATE VII. 



FJO. 



1. TUBULARIA DUMORTIERII, p. 50, of the natural size. 



2. A portion of the same magnified. This and the preceding 



figure are copied from Van Beneden's Recherches sur 

 Fembryog^nie des Tubulaires, pi. ii. fig. 1, 2. 



3. OORYMORPHA NUTANS, p. 54, of the natural size. 



4. CORYMORPHA NUTANS in a different position. 



5. A magnified view of the head of CORYMORPHA NUTANS, 



shewing the arrangement of the tentacula, the form of 

 the ovaries, and the internal structure of the stomach. 



6. The portion of the deciduous tube which remains in the 



adult Corymorpha. 



*,* For the whole of the Figures of Corymorpha nutans I am indebted to Professor 

 Edward Forbes. 



