POLYPS AND COKALS, 31 



•of an inch and rise nearly a quarter of an inch above the 

 coenenchyma. The exterior of the corallites is obscurely 

 and closely costate, and covered closely with rough granula- 

 tions. Septa in four cycles, the last imperfectly developed. 

 Primaries much thicker than the others, very narrow at the 

 top and not projecting above the wall, which is much thick- 

 ened, on their inner edges slightly concave, and increasing 

 somewhat in width toward the bottom of the cell, where they 

 join the columella. The secondaries are still narrower and 

 thinner, but also join the columella. Those of the third or- 

 der are extremely narrow and often do not reach the mar- 

 gin of the wall, and do not join the columella. Those of 

 the fourth order are merely slightly raised costee, very thin 

 and uneven. Columella well developed, spongy, nearly half 

 as broad as the cell. 



Cells slightly oval, the larger ones about .35 of an inch 

 in diameter, and nearly the same in depth. 



Color of living polyps vermillion red. 



Sandwich Islands, at low water mark. Horace Mann. 



It is with pleasure that I name this species in honor of 

 its discoverer, Mr. Horace Mann, a young man of unusual 

 ability and industry, who made many important botanical 

 discoveries, during his explorations in the Sandwich Islands. 



SUBORDEE, ASTE^IAOEA. 



Family, Lithophyllid^. 



Muss A GKANDis Bdw. and Haime. (?) 



A worn specimen allied to this species. It has, however, 

 some of the polyps united into series of three or four and oth- 

 ers simple but deformed, these are 1.25 inches or more in 

 diameter. Columella well developed spongy. Walls spar- 

 ingly spinose. 



Coral Sea, East of Australia. Dr. Wm. Stimpson. 



