arched with sharp margin, terminating at edge of groove. 

 Columella solid, i mm thick, centers not marked. 

 Sometimes reduced columella and septa, meeting across 

 valley. 



44. !Mussismilia brasiliensis (Verrill) . 



Also Vrotomussa brasiliensis, (Matthai, 1928), also 

 !Mussa (Symphyllia) brasiliensis, and !Mussa (Sym- 

 phyllis) tenuisepta, (Verrill, 1902). 



Described by Matthai (1928), page 269. 



Cups up to 25 mm long, inegularly oval, separated 

 by grooves. Septa with teeth not directed upwards as 

 in !Mussa. Found only on the Brazilian reefs. 



Massive and heavy, calicinal surface convex, lower 

 surface with broad attachment. Mono-, di- and tri- 

 stomodoeal polyps. Corallites 12- 15 mm wide, up to 

 2 5 mm long, 7 mm deep, narrowing towards columella. 

 Collines 3-6 mm, with groove above. Septa 10-12 

 per cm, 6 principals, continuing over colline or meeting 

 in groove, principals about .75 mm thick exsert about 

 1 mm. Septa perforated, teeth coarse, directed hori- 

 zontally. Columella well developed, 2-3 mm in width 

 of closely twisted septal trabeculae. 



45. !Mussismilia hartii (Verrill) . 



Also Protomussa hartii, (Matthai, 1928), also 

 !Mussa hartii, (Verrill, 1902). 



Described by Matthai (1928), page 270. 



Cups irregular in shape, from 12 to 30 mm across, 

 on ends of branches which are joined together along a 

 varying part of their length. Similar in other respects 

 to !M. brasiliensis, but septal teeth thinner. Found only 

 in Brazil. 



Branchinc^, branches dividing dichotomously, peri- 

 theca present or absent in varying cjuantity so ihat 



95 



