4 6 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I49 



Fig. 14. — Growth changes in the api- 

 cal system of Meorna ventricosa 

 (Lamarck). Only three small geni- 

 tal pores present; A. specimen 

 44 mm. long (X 16); station 17; 

 USNM E10314. B. Madreporite be- 

 ginning to expand posteriorly; all 

 genital pores present; specimen 

 71 mm. long (x 10); station 30; 

 USNM E10313. C. Madreporite 

 greatly expanded posteriorly; spec- 

 imen 144 mm. long (X 5.3); station 

 17b; USNME10312. 



