1873.] moetimee — yoeksiiiee chaek haekings. 417 



It would appear, in order that Palceocoryne might be a Bhizopod, 

 that a cellular base, the stem, capitulum, and tentacles should have 

 been filled with sarcode which was capable of prolougation in 

 the form of pseudopodia from the ends of the tentacles and from the 

 so-called metastome. 



But there should be some calcareous structures within the stem 

 and other cavities resembling the irregular external septa of Squam- 

 mulina scopula, Carter, for instance ; or the calcareous periderm 

 should be perforate or minutely tubular. 



Such septa and perforations do not exist in Palceocoryne, whose 

 external form and ornamentation are in my mind opposed to its 

 proposed Bhizopodal alliance. 



I venture, then, to suggest that the form should still remain asso- 

 ciated with the Tubularine Hydrozoa, in spite of its abnormalities. 



EXPLANATION OF PLATE XIV. 



Fig. 1 . A specimen of Palceocoryne, showing the branching of the stem : magni- 

 fied. The branches are inferior. 



2. Specimen showing the inetastoma : magnified. 



3. Specimen showing the prolongation of the stem past the whorl of ten- 



tacles: magnified. 



4. Another view of the same in a different specimen : magnified . 



5. Palceocoryne radiata, from the Phil, Trans, vol. clix. pi. lxvi. fig. 7. 



6. Palceocoryne scotica, from the Phil. Trans, vol. clix. pi. lxvi. fig. 1. 



7. Stem without the capitulum : magnified. 



2. Notes on Mabeijstgs in the Cb:aek of the Yokeshiee Woles. 

 By B. Moetimee, Esq. 



(Communicated by W. Whitaker, Esq., B.A., F.G.S.) 



[Abstract.] 



In this paper, which was illustrated by a large series of specimens, 

 the author called attention to some peculiar striated markings resem- 

 bling structure which he had observed on pieces of chalk from widely 

 distant places on the Yorkshire Wolds. Similar markings had been 

 noticed in the chalk of the south of England ; and in 1860 Mr. S. J. 

 Mackie, in an article published in the ' Geologist ' (p. 77), alluded to 

 them, and ascribed them to slickensides. From an examination of 

 his own specimens, the author has come to tbe conclusion that the 

 markings in question are not accidental, nor are they caused by the 

 weathering of the surface of the chalk, or by the percolation of 

 water through overlying chalk. He is of opinion that such needle- 

 shaped stria?, running in such various directions, could not have 

 been produced by the chalk being " shifted, squeezed, and rubbed 

 by the creep of the beds," as supposed by Mr. Mackie — as, if such 

 an action could be exerted on small pieces of chalk, scratching them 

 in various directions, the scratches ought to differ much in thickness 



