diameter. Septa have small rough teeth and are porous, 

 12 in number. Abundant from Florida reef and Ba- 

 hamas to Brazil. Also present at Bermuda. 



Encrusting when young, massive subnodular, caltces 

 i.2 5 to i.50 mm in diameter. Jwelve septa, porous, 

 rarely distinct pali. Columella very small, porous. Cal- 

 tces larger, deeper and with higher and more distinct 

 walls than P. porites. 



14. Vorites hranneri Rathbun. 

 Described by Verrill (1902), page 162. 



Very porous rounded masses up to six inches, formed 

 by thick encrustations over stones or dead coral. Small 

 cups about 1 mm across. Inner edges of septa join to 

 form a ring. Found on Brazilian reefs and possibly in 

 the West Indies. 



J^hick rounded encrustations, 3-6 inches, covering 

 dead coral. Calices small and shallow, crowded, poly- 

 gonal, with thin fenestrated walls, diameter 0.9 to i.2 

 mm. Septa i2, narrow, spiny and fenestrated, inner 

 edges uniting to form columelliform ring. Pali, when 

 present, 3 to 5, slender, erect. 



15. Vorites divaricata Ltsucur. 



Discussed by Vaughan (1901), page 316. , 

 Although this is probably a variety of P. furcata or 

 P. porites it is distinct in appearance. The branches are 

 much smaller than P. furcata, under 6 mm in diameter 

 with no tapering or dilation along the length of a 

 branch. Florida, Bahamas and the West Indies. 



'Branches less than 6 mm diameter, same at proximal 

 and distal end, calices very shallow, 2 mm in diameter. 

 IVall narrow, rather flat or subacute. 



16. Porttes fwrc<^t^ Lamarck, (Plate 8) . 

 Discussed by Vaughan (1901), page 316. 



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