19. 7avia conferta Verrill. 



Described by Verrill (1868), page 355. 



Discussed by Vaughan (1901, page 304. 



Encrusting masses, never very large. Yellowish brown 

 in color. Cups irregular in shape, also short valleys 

 separated by narrow walls. Septa similar to J^. fragum. 

 Only at Brazil. 



Encrusting or sub-massive up to a few inches. Intra- 

 tentacular budding. Tdonostomodoeal polyps or short 

 series, forming curved but not sinuous valleys, sep- 

 arated by small narrow collines. Otherwise similar to 

 7. fragum. Costate, septa exsert. Septal margins irregu- 

 larly dentate. Columella parietal, spongy. 

 20. 7avia fragum (Esptr) (Plates 12, 13). 



Discussed by Vaughan (1901), page 303. 



Forms small crusts on other rocks or small rounded 

 pebbles an inch or two long. Light yellow to brown. 

 Cups angular, circular or oval, under 6.5 mm across. 

 Septa have irregular teeth on margins. Bermuda, 

 Florida, the Bahamas and the West Indies. Common in 

 shallow water. 



Encrusting or capuliform masses or subhemispherical, 

 up to 50 mm. Calices circular, angular or elliptical. 

 Under 6.5 mm in diameter. Average 4.5 mm or less, 

 avails i.5 mm or more. Septa from three to nearly four 

 complete cycles, 3 6 to 40, margins irregularly dentate. 

 Costae acute, dentate. Columella large, spongy. 

 21. 7avia gravida Verrill 



Described by Verrill (1868), page 354. 

 Similar to 7. fragum. Walls of cups stand out above 

 surface and separate from each other. Cups oval or 

 deformed by crowding, never elongated into valleys. 

 Brazil only. 



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