J. F. Walker — Liassk Sections near Bridport. 437 



sliown that a similar change must be made in the position of 

 a species which I referred to Pericosmus compressus (Duncan). 

 He removes the specimen figured to Eapatagus on the ground of 

 the tubercles on the abactinal surface ; but this alone would be 

 insufficient to necessitate its removal. I have, however, worked 

 away the matrix covering the subanal area of the type-specimen, a 

 risk to which I did not previously cai'e to subject it. This shows 

 that a subanal fascicle is present ; the species must therefore be 

 removed from the Prymnadete to the Pi-yranadesmian group. But 

 in Eupatagus the species has not reached its final resting place, for 

 in that genus the petals of the paired ambulacra are broad and flush, 

 with large poriferous zones : in this species they are long, narrow, 

 and depressed, and the pores are small, and not so strikingly dis- 

 similar in size. It therefoi'e belongs to the genus Macropneustes, 

 which Prof. Duncan regarded as only a Buh-genn^oi Fjupatagus,^ but 

 which most authors keep as a quite distinct genus. The synonymy 

 of this species will therefore be : 

 Periensmus comp^-essus, Dune, non M'Coy. Gregory, Geol. M^g. 1890, p. 485, 



PL XIV. Fig. 1. 

 Eupatagus decipiens, Tate. Trans. Roy. Soc. S. Australia, vol. xiv. p. 282. 

 Macropiieuntes decipiens, Tate. Gregory. 



DESCRIPTION OF PLATE XII. 



Fig. 1. — Laganum decagonale (Less.) var. ricium, n. var. Shark's Bay, W. Australia. 



Figs. la. Abactinal side ; lb. Aetinal side ; Ic. Lateral view. 



Nat. size. 

 Figs. 2, 3 and 4. — Cassidulus florescens, n. sp. Middle Murravian. Fyan's Ford, 



near Geelong. Figs. 2«. Abactinal side ; 2b. Aetinal side ; 2v. 



Lateral view : each X 2 dia. 

 Fig. 3«. — Abactinal side ; 3i. Aetinal side ; 3c. Lateral view ; Zd. Apical system : 



X 4 dia. Fig. 4. — Posterior view of another specimen : x 2 dia. 



11. — On Liassic Sections near Bridport, Dorsetshire. 

 By John Francis Walkek, M.A., F.G.S. 



DURING my visits to West Bay, Bridport, in the years 1887 and 

 1888, I was able to examine the following inland sections of 

 the Lias Junction Bed, and I communicated a paper to the British 

 Association at Leeds in 1890; an abstract of this paper appeared iu 

 the Report, 1 had hoped to obtain more evidence of the nature of 

 this deposit, but, unfortunately, last year, 1891, I found that the 

 working of the Allington brickfield was being abandoned, and that 

 it was difficult to further work the roadside cuttings without doing 

 considerable damage. I therefore think it better to lay before the 

 readers of the Geological Magazine my notes on this deposit, 

 which I shall be able to show is variable in different sections, due 

 to the amount of denudation which has taken place. 



Several notices of the Junction bed have been written, but chiefly 

 with reference to the sea-coast section. I will only refer to those 

 required for discussion in this paper. 



In the Quarterly Journal of the Geological Society, 1863, Mr. 

 Day gave an account of the junction bed of the Upper and Middle 



M. Cotteau has recently given admirable figures of the ij^e species, Macropnennies 

 yesi, Ag., Pal. Fran9. Echinides Eocenes, pi. xxxi-xxxiii. 



