which two manuscript names, unaccompanied by any description or 

 figure, have been applied at different times by Mr. E. Billings. In the 

 Museum of the Survey the species is labeUed' Amplexus congregatus, Bil- 

 lings, by that naturalist himself, the label being not written but printed. 

 The same coral is called Amplexus Jaxatus in the latter part of the 

 twelfth chapter of the " Geology of Canada." As both of these specific 

 names would be singularly inappropriate for this coral as now under- 

 stood, it is not thought desirable to pei-petuate either. 



Natural transverse sections of this species, (as in the original of fig. 16, 

 on plate 1) shew a quadripartite, and more rarely a tripartite division 

 of the corallites. This appeai-ance might be supposed to be the result 

 of fission, rather than of calicular gemmation, but is really due to the 

 coalescence of the inner walls of the corallites immediately after bud- 

 ding, — as in the case of the genus Biphyphyllvm. 



PyCNOSTYLUS EI/EGANS. (N. Sp.) 

 Plate 1, flgs. 2 & 2a. 



Corallites attaining to a diameter of from thirteen to seventen milli- 

 metres : increasing by calicular gemmation in such a manner as to 

 divide into six or seven branches, on the same plane : external surface 

 regularly and longitudinally rilibed, the ribs alternating with the septa 

 within : all the septa of uniform height and size. 



Hespeler, T. C. Weston, 1867 : Durham, Mr. J. Townsend. 



The only specimen of this coral in which calicular gemmation is 

 plainly visible is presented by figure -2 on plate 1. Part of this speci- 

 men is covered with rock, but on the exposed surface five buds are visi- 

 ble, one of which is an inch and a quarter long, while the other four 

 are broken off at their bases. Judging by the diameter of the buds in 

 propor.tion to that of the calyx from which they spring, it is probable 

 that the entire cycle would consist of either seven oi' eight. 



It is possible that the specimens for which the above name in provisi- 

 onally suggested may prove to be portions of the basal extremity of 

 P- Guelphensis denuded of their epitheca, but at present no intermedi- 

 ate examples between the two forms have been collected. 



BEACHIOPODA. 



Spirifera plicatella, Sowerby. 

 Durham, Mr. J. Townsend : three single valves. 



