804 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 73 



Fig. 1. Diplosolen ohrlium (Johnston), ovicell enclosing peristomes 



of normal and diminutive tubules; ooeciostome near center. 

 Fig. 2. PlcKjioecia tuhiahurth'a (Canu and Bassler), ovicell with 



terminal ooeciostome. 

 Fig. 3. Plagioecia sarniensis (Norman), sho\ving basal tubule and 



transverse expansion of ovicell and terminal ooeciostome; 



one peristome enclosed. 

 F'ig. 4. Platjioecia patina (Lamarck), basal tubule and usual broad 



expansion of ovicell, with terminal ooeciostome. 

 Fig. 5. Rorgiola pustulosa new species, surface view with "pus- 

 tules," and broken edge of type specimen. 

 Fig. 6. The same, at broken edge showing brood-chainber traversed 



b\- tubules. 

 Fig. 7. The same, showing the occasional pointed peristomes at the 



edge of a pustule. 

 Fig. 8. The same, margin of zoarium. 

 Fig. 9. The same, enlargement of a pustule. 

 Fig. 10. Heteropora alaskensis (Borg), terminal portion of branch 



\vith brood-chamber, the roof partly removed to show the 



cavit\ traversed by tubules; note also the high peristomes. 

 Fig. 11. The same, closure and partial closure of peristomes near 



base of zoarium. 

 Fig. 12. The same, mode of branching of a >()ung zoarium. 

 Fig. 13. Heteropora magna O'Donoghue, a characteristic zoarium 



showing mode of branching and anastomosis; the primary 



base and two secondarv attachments. 



