REPORTS OF COMMITTEES. 281 



3.— ON A BEACHIOPOD AND SOME PHYLLOCARIDS OF 

 LOWER ORDOVICIAN AGE FROM A GLACIAL ERRATIC 

 AT WYNYARD, TASMANIA. 



By F. CHAPMAN, A.L.S., etc.. National Museum, Melbourne. 

 [With Plate.] 



The fossils referred to in the following notes occur on a rough 

 cleavage face of a slab of black indm'ated shale broken from an erratic 

 found in the Carbo-perniian glacial beds of Wynyard, near Table Cape, 

 Tasmania. For the opportunity of examining these fossils I am in- 

 debted to Mr. T. S. Hall, M.A., to whom the rock specimen was sent 

 by its discoverer, Prof. T. W. Edgew^orth David, F.R.S. 



Description of the Fossils. 



Class BEACHIOPODA. Order NEOTREMATA. 



Genus Siphonotreta, DeVerneuil. 



Siphonotreta maccoyi. Chapman. See plate, fig 1. 



S. maccoyi, Chapman, 1903, Proc. Roy. Soc, Vict., vol. xv. (N.S.), 

 pt. II., p. 118, pi. XVIII., figs. 12-14. 



Remarhs. — The structure of the specimens referred to the above 

 species is, in places, remarkably well preserved, so that further diag- 

 nostic characters of the species are afforded beyond those originally 

 given in the description of the Victorian specimens. The valves in 

 the present example are somewhat crushed, and in the figured specimen 

 the dorsal has partially slipped aside from the pedicle valve. The 

 umbonal or apical part of the dorsal valve is rather prominent. The 

 hollow conical beak of the ventral valve is strongly compressed, and 

 the tubular canal is clearly seen through the thin shell, together with 

 the striated areas of the muscle attachments on either side. The sur- 

 face of the valves, especially near the apex, is marked with fine radii. 

 By the discovery of this specimen the distinctness of S. maccoyi from 

 S. micula, to which species McCoy originally referred it, is even more 

 evident. In the original description of this species I remarked on the 

 variation betw^een the Lower Ordovician and Upper Ordovician ex- 

 amples from Victoria, the former being smaller than the latter. The 

 present specimens also agree in this feature wdth the Lower Ordovician 

 forms. 



Measurements of the fresent figured examfle : — Length of dorsal 

 valve, 5'7mm. ; wndth of dorsal valve, 4-9mm. ; depth from apex of 

 ventral valve to outer margin of false cardinal area, l'2mm. 



Class CRUSTACEA. Order PHYLLOCAEIDA. 

 Genus Caryocaris, Salter. 

 Caryocaris wrightii, Salter. See plate, figs. 2, 3, 5. 

 C. wrightii, Salter, 1863, Quart. Jovirn. Geol. Soc, vol. xix., 

 pp. 137, 135, fig. 15, p. 139. Jones and Woodward, 1892, Pal. Soc. 

 Mon., Brit. Pal. Phyllopoda, pt. II., p. 89, pi. xiv., figs. 11-15, figs. 

 5 and 6 (woodcuts). 



