1913.] NATURAL SCIENCES OF PHILADELPHIA. 599 



other cases the rock is composed of masses and fragments of corals. 

 The corals of the Nugent collection were determined by Duncan," 

 who gives the following list of species: 



Duncan's List of Corals in the Nugent Collection from the Antigua 

 Formation. 



AstroEa crassolamellata Duncan, with the varieties magnetica., 

 pulchella, nohilis, minor, nugenti, magnifica. 

 Astrcea antiguensis Duncan. 

 Astrcea endothecata Duncan. 

 Astrcea tenuis Duncan. 

 Astrcea harhadensis Duncan. 

 Astrcea radiata Lam., var. intermedia Duncan. 

 Astrcea costata Duncan. 

 Rhodaraa irregularis Duncan. 

 Alveopora dcedala Blainv., var. regularis Duncan. 

 Alveopora microscopica Duncan. 

 Alveopora fenestrata Dana. 



Of these the species Alveopora dadala Blainv. is common to the 

 tuffs and to the Antigua Formation. The corals collected by Pro- 

 fessor Spencer were referred to Dr. T. Wayland Vaughan for deter- 

 mination, who reported the following list: 



Trochosmilia n. sp. 



Stylophora sp. 



Stephanocoenia sp. 



■\Astrocainia ornata Ed. and H. 



Brachyphyllia sp. 



*Orbicella (Astrcea) crassolamellata (Duncan). 



^Orbicella cellulosa (Duncan). 



*Orbicella endothecata (Duncan). 



Orbicella sp. 



Symphyllia n. sp. 



■\Astroria polygonalis Duncan. 



Oroseris n. sp. 



■\*Alveopora regidaris Duncan. 



Porites n. sp. 



Of these species, the ones marked with an asterisk (*) are in 

 Duncan's list from the white Antigua limestone, and the ones 

 marked with a dagger (f) are found in Duncan's list of the corals 

 in the Nugent collection from the tuffs. Dr. Vaughan recognizes 

 eight species not in Duncan's list. One species is common to the 

 tuffs and the white limestone (f*). As Spencer remarks, this 



Quart. Jour. Geol. Soc. London, Vol. XIX, 1863, p. 410. 



