J. F. WMteaves — Heieropora from Juan de Fuca. 



Cumming's Bridge were included, and in a letter received from 



Mr. Davidson in May last they are reported upon as follows: 



" The Siphonotrela from near Ottawa interests me much. It 



; rt.ers with the Upper Llandeilo 



species which I n;imod > .-■■ notreta Scolica. lam very uncer- 



fcher the Wenlock Shale species named & Anglica by 



Morris is the same or not. Only one crushed specimen of the 



A! Anglica has been found, and its spines are annulated as 



described by Morris. I could see no ambulations in the spines 



of the many specimens of S. Scotica found by Mrs. Gray in the 



Upper Llandeilo of Craighead, nor do I see any in your speci- 



' ' of the 



mens. As there is uncertainty as to the specific identity < 

 highest Upper Silurian form with the Lower Silurian one, ana 

 3 been found in all that mass of intervening strata, 

 visionally to retain the two names, or until other 

 t species shall have been found." 



I pre 



|.r..vi 

 -I] u-i:. 



with those from Scotland, the 

 >ecies must have had a considerable range in time, for the 

 "pper Llandeilo rocks are generally regarded as of about the 

 ime age as the Chazy Limestone of the State of New York, 

 )d the Utica Slate as corresponding to beds on a comparatively 

 igb horizon in the Caradoe or Bala Group. To the paleon- 

 •logist, Mr. Watts' discovery will be of special interest, as this 



the first time that the occurrence of a species of /Siphonotrela 



North America has been placed upon record. 



Art. XXXIL— On a recent species of Heieropora from the 

 Strait of Juan de Fuca ; by J. F. White aves. 



The genus Heieropora was constituted by DeBlainville in 

 1830 for the reception of a number of fossil species of Polyzoa 

 of the order Cyclostonu tors are thus defined by 



Busk : " Polyzoarium erect, cylindrical, undivided or branched ; 

 surface even," furnished with openings of two kinds; the larger 

 representing the <>n/ios of tin; cells, :uid the smaller the oslioles 

 of the interstitial canals or tubes." " The essential character of 

 the genus," writes Dr. H. A. Nicholson, "is thus the possession 

 (ton made up of two kinds of tubes, larger and smaller, 

 the latter being the most numerous." Further, it has been 

 ascertained that the tubes of Heieropora are provide- 1 with 

 cross paititions and radiating spines, and that their walls are 



