530 Verrill^ Notes on RacUata. 



Some of the clusters are 2 inches across ; the corallites '05 to '25 

 apart; '10 to "25 high ; '10 to "15 in diameter ; depth of cup -06 to "10 ; 

 primaries about "OS broad ; '02 exsert. 



La Paz, on base of Eugorgia nohllis, in 4 to 6 fathoms, — J. Peder- 

 sen ; Guaymas, on dead shells, — Dr. E. Palmer (Chicago Acad. Sci.). 



This species resembles A. Ilaiuiei more than any of the other 

 species, owing to its deep open calicles, but is readily distinguished 

 by its decidedly costate exterior ; by the broader and more exsert 

 primary septa ; and especially by the fewer and quite unequal septa 

 and wide interseptal chambers. 



Subgenus, Coenangia Verrill. 



Corallites united together laterally, forming small, Astrsea-like, 

 encrusting masses, sometimes rising into lobes in the middle. Cali- 

 cles angular and crowded. Septa without distinct paliform teeth 

 at base, those of the last cycles curved towards and usually united to 

 those of the preceding cycles. Columella small or moderate, scarcely 

 papillose, composed of contorted processes originating from the septa. 

 Budding takes place mostly in the angles between the corallites, both 

 around the margin and in the central parts. 



Besides the following species this group includes A. bella and A. 

 Marylandica (Conrad sp.), from the later tertiaries of the eastern 

 coast of the United States. A. Danm Ag. from the Virginian fauna, 

 and A. astrmiformis E. and H., from the Carolinian fauna, are inter- 

 mediate between this sub-genus and the typical species, in mode of 

 growth. 



Astrangia (Coenangia) conferta VerriU, sp. nov. 



Coralla encrusting, forming Astrtea-like crusts with an uneven surface, 

 two or three inches broad and about a third of an inch thick in the 

 middle, consisting of crowded prismatic corallites, intimately united 

 together throughout their whole length. Calicles deep, narrow at 

 bottom, angular, often oblique and expanded on one side, the adjacent 

 ones separated only by a thin, sharp wall ; interseptal spaces rather 

 wide, double the thickness of the septa. Columella small, composed 

 of rough, irregular, oblique, transverse, and more or less contorted 

 lamelliB, arising from the inner edges of the septa, the upper sur- 

 face more or less roughened with small granules, but not papillose. 

 Septa subequal, in three cycles, usually 24 in the largest cells, all of 

 them thin, very narrow at the top, the edge sloping to the columella 

 or somewhat concave, sharply and roughly denticulate throughout, 

 without distinct paliform teeth at base, the sides with few, very scat- 



