Manchester Memoirs^ Vol. xliii. (1899), No. 1. 9 



equal distances. As in the type, the first branchings are 

 placed at an acute angle with each other, the last ones 

 being fairly parallel. The agreement of these specimens 

 with the description given of the species by Hopkinson 

 and Lapworth* is very close. They are too badly preserved 

 to show the hydrothecae but the regular bifurcation, the 

 flexuous character of the branches and the close corre- 

 spondence of size are distinctive. 



Worm-castings, tracks and burrows. 



Under this head must be placed the PalcBochorda 

 major and P. minor McCoy, once regarded as fucoids. 



PalcBochorda major was recognised in the Manx slates 

 by Profs. Harkness and Nicholson, and considered by 

 them of considerable value in correlating the latter with 

 the Skiddaw slates of the Lake district. 



If, as we may suppose, the earlier workers considered 

 the species as a fucoid, it is easy to understand the 

 frequency of the finding of " fucoids " by them. 



Worm-castings, tracks and burrows are fairly common 

 in many of the Manx slates, and certain grits are almost 

 composed of them. Especially is this the case in the 

 cliffs south of Forth Mooar. 



Palceochorda m.inor McCoy. [Plate i,figs. 3, 4, 5.) 



The smallest worm-castings the writer has seen are in 



a series collected by Mr. G. W. Lamplugh, and kindly 



placed at his disposal by the Director General of the 



Geological Survey. 



The castings are usually in the form of long straight 



semi-cylindrical rods, rarely occurring in clusters or 



showing much trace of coiling. They consist of grains of 



sand hardened into a fine grit. 



* " Descriptions of the Graptolites of the Arenig and Llandeilo Rocks of 

 St. Davids." Quart, /ourn. Geol. Soc, Vol. xxxi., 1875, p. 662. 



