Notes and Comments. 



103 



ftrst given by Williamson to some specimens from a coal-measure 

 nodule found at Oldham. This was in 1888. Some time 

 previously Williamson had recorded a stem of the same type, 

 imder the name of Anachoropteris decaisnii. Williamson's 

 specimens, however, were never properly figured and described. 

 More recently a series of sections from a specimen at Shore, 

 Littleborough, has enabled Dr. Scott to prepare the present 

 detailed memoir. He concludes that Zygopteris grayi is a 

 member of the genus Ankyropteris, as shewn especially by the 

 presence of peripheral loops on the leaf-trace. 



YORKSHIRE TYPE AMMONITES.* 



We are glad to find that part 6 of this important work has 

 made its appearance, and contains illustrations and descrip- 



tions of Ammonites macnlatiis, heterogenes, integricostatus , 

 siphuncularis, cerens, perarmatus, and athleticiis. The illustra- 

 tions are quite equal to those in previous parts. One of them, 

 viz. Ammonites perarmatus, we are kindly permitted to repro- 

 duce herewith. The original is in the Whitby Museum. The 

 work is certainly worthy of every encouragement. 



STRATIGRAPHICAL NAMES. 



In the Geological Magazine for March, Dr. F. A. Bather 

 rightly draws attention to the fact that it is time something 

 was done in regard to the new names which are constantly 

 being added to geological literature. His card index of names 

 of geological formations, etc., has a thickness of two yards ! 

 He suggests that a committee should be appointed, say by the 



* By S. S. ]>uckinan Part \'I. Wesley & Sons, 1912, price ^/j?. 



igi2 April i. 



