248 Proceedings of the Royal Irish Academy. 



original." It suggests to him a resemblance to Walcott's Solenoplcura howlei/i 

 from the Cambrian of Conception Bay, Newfoundland,' but he is not certain 

 that it is referable to even that genus. 



Another specimen illustrated in Plate XXIII, fig. 5, and Plate XXIV 

 fig. 6, was found by us on our second visit to Bray. This was also sent for 

 identification to Mr. Eeed, who reported to us that it was confirmatory of his 

 opinion about the previous specimen. Eegarding fig. 7, Plate XXIV, the 

 same authority compares the fossil parts represented therein with the 

 appendages of Walcott's Middle Cambrian merostomatous species, Sidneyia 

 inexpectans.^ The authors of this paper, however, have been struck with the 

 resemblance of this Bray fossil to Zouisella pedunculata, illustrated and 

 described by Walcott, and suggest that it may be identical with that 

 species.' Mr. Eeed concludes his description of the fossils submitted to him 

 in the following words : — " I must suspend judgment till more material is 

 available, and until then you mvist consider my views only preliminary and 

 provisional in both cases." 



Mr. Eeed has not had the opportunity of examining the markings in 

 fig. 8, which, with those of figs. 5 and 6, and many more fragments 

 found in one or other of our eight visits to Bray Head, show a striking 

 similarity to Walcott's recently described Holothurian Eldonia ludwigi, a 

 figure of which we reproduce (Plate XXIII, fig. 4) from Walcott's paper 

 for comparison.* Indeed, our geological and biological friends in Dublin, to 

 whom we have shown the specimens, are convinced of the similarity. In 

 fragments other than those illustrated the characteristic central ring and the 

 beautifully marked radial canals are more evident. In figs. 5, 6, and 8 

 the typical shape, markings, and size of Eldonia l-udwigi are at once 

 apparent. Generic identification with Walcott's type may therefore be safely 

 assumed. 



The type species described by Walcott was found in the fine-grained silico- 

 argillaceous shales of the Stephen formation at Burgess Pass, east of Mount 

 Burgess, and on the west slope of Mount Field and the ridge extending to 

 Wapta Peak, British Columbia. He supposed it to have been a free-swimming 

 Holothurian of the order Actinopoda, with a medusa-like umbrella-shaped 

 radially lobed body. Its conspicuous features are the alimentary canal 

 arranged in an open spiral, situated in the umbrella midway between the 



1 " Olcnellus Fauna," U.S. Geol. Suivey, lOtli Annual Report, p. 657. 1888-89. 

 - " Middle Cambrian Merostoniata," Sniitbsonian Misc. Coll., vol. Ivii, No. 2, plate iv, fig. 3. 

 ■* '' Middle Cambrian Hololburians and Medusae,'* Smitbaonian Misc. Coll.. vol. Ivii, No. 3, 

 plate xiii, tig. -1. 

 ' Ibid. 



