804 ALLAN HAXCOCK PACIFIC EXPEDITION'S VOL. 



PLATE 73 



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



of normal and diminutive tubules; ooeciostome near center. 

 Fig. 2. Pla/iioecia tuhiahortii'a (Canu and Bassler), ovicell with 



terminal ooeciostome. 

 Fig. 3. Plat/ioecia sarniensis (Norman), showing basal tubule and 



transverse expansion of ovicell and terminal ooeciostome; 



one peristome enclosed. 

 F'ig. 4. Plat/ioecia patina (Lamarck), basal tubule and usual broad 



expansion of ovicell, with terminal ooeciostome. 

 Fig. 5. Bor(jiola ptistiilosa new species, surface view \vith "pus- 

 tules," and broken edge of type specimen. 

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



by 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 



with brood-chamber, the roof partly removed to show the 



cavity 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 young zoarium. 

 Fig. 13. Heteropora rnat/ria O'Donoghue, a characteristic zoarium 



showing mode of branching and anastomosis; the primary 



base and two secondarv attachments. 



