Plate I. 



Fig. i. Pliobothms symmetricw, front surface of an intact colon)- from the "Ingolf ' St. 55. Natural size. 



— 2. — — hind surface of the same colon)-. Nat. size. 



— 3. — — two ends of branches from "Ingolf St. 55. 4/,. 



— 4. Sty last rr gcmmascens; one of the type specimens of Gunner us' Madrepora virgin ca from the 



west coast of Norway. Nat. size. 



— 5. Stylastcr gcmmascens\ front surface of an openly built colony from the Trondhjem Fjord. 



Nat. size. 



— 6. Stylastcr gemmascais; hind surface of same colony. Nat. size. 



— 7. — front surface of the compact branch of a fertile colony ($) from the 



Trondhjem Fjord. Nat. size. 



— 8. Stylastcr rosct/s; front surface of a fragment of a colony from Angmagsalik with male ampullae 



Nat. size. 

 — 9. Stylastcr roseus; hind surface of the same fragment. Nat. size. 



