PLATE LXXVII. 



FIG. 



I, 2. CYLINDIKECIUM DILATATUM, p. 536. See 

 Plate LXXIX. 



3, 3 a. CYLINDIKECIUM GIGANTEUM, p. 535. 



, showing the ova collected at the top of 

 the zooecium previous to escape. 



5, 5 a. ANGUINELLA PALMATA, p. 539. 



6. AVENELLA FUSCA, p. 527. After Dalyell. 

 . After Wyville Thomson. 



