Peculiar Growth in Black Walnut. 235 



Asterophycus, Monocraterion and Astrapolithon is pointed out. 



Under the new generic name of Sabellarites, the Author 

 describes certain tubes, composed of shelly and other frag- 

 ments cemented by organic matter, found in the Trenton 

 Black-river Limestone. They resemble the burrows or tubes 

 formerly described by the Author from the Hastings and 

 Quebec Groups, and appear to be the tubes of worms allied 

 to the recent Sabellarice ; but they are liable to be mistaken 

 for Algae of tbe genera Palceophycus and Buthotrephis. 



Some large cylindrical bodies from the Potsdam Sand- 

 stone, are described as having been supposed to be trunks 

 of trees ; but the Autbor regards them as probably concre- 

 tions formed around slender stems, like some now forming 

 in the alluvial mud of the St. Lawrence, (and described in a 

 recent number of this Journal.) 



Some curious combinations of worm- tracks with ripple- 

 marks and shrinkage-tracks, are described ; as also branch- 

 ing or radiating worm-trails which present some resem- 

 blance to branching Fucoids. Finally, the Author describes 

 the formation of rill-marks on the mud-banks of the tidal 

 estuaries of the Bay of Fundy, and indicates their identity 

 with some impressions in slabs of rock, which have been 

 described as Fucoids under several generic names. 



The paper will probably be published in full, with illus- 

 trations, in the November number of the Journal of the Ge- 

 ological Society. 



A New Canadian Piatynus. 



By J. T. Hausen. 



PLATYNUS HORNII Sp. nOV. 



Piceus, subviridiasneus, non nitidus, subtus fuscus vel rufo- 

 fuscus, elytris obscure vividibus, satis strialis, striis 

 impunctatis, interstitiis paullum complanatis, rugulose 

 punctulatis, costa tertia quinque foveolata ; capite viridi, 

 bisulcato; antennis nigris, scapo, palpis, mandibulis, 

 pedisbusque rufes centibus. prothorace latitudine paullo 



