( 
Vol. 58. | ASSOCIATED BEDS OF THE MALVERN HILLS, 1) 
Hyoriruvs assvLatus,' sp.nov. (Fig. 26.) 
An apparently nearly complete individual, the dorsal side ot 
which alone is exposed. Shell straight: length indicated, 4:5 mm. ; 
breadth at the oral end, 3°25 mm. ; 
Fig..26.—Hyolithus assulatus, angle of divergence, about 40°, 
sp. nov. (xX 6 diam.) Ventral surface slightly arched, 
apparently quite smooth. Oral 
margin gently curved. Sides, for 
about two-fifths of their length, 
furnished with a strong conical 
bar. Occurrence, probably in the 
dark shales of the Dectyonema- 
bog beds, but possibly from the Black 
\ed Shales (zone of Spherophthalmus). 
y The only specimen is in_ the 
Worcester Museum. 
The small size, the rapid attenua- 
tion, and the lateral bars, con- 
[From the Upper Cambrian Shales jointly distinguish this species 
of Malvern. ] from any hitherto described. It 
appears to approach most nearly 
to H. tardus, Barr., from the Lower Devonian of Bohemia,’ but 
differs in the smaller size and larger angle of divergence. It 
also resembles H. expansus, Holm, from the Silurian of Sweden,’ 
but is much smaller and more obtuse. 
ak 
o 
(6) Trilobites etc. from the Black and Grey Shales. 
(a) Black Shales. 
No new trilobites have been certainly detected in the Black 
Shales, but in connection with the species Agnostus trisectus, Salt., 
A. princeps, Salt., has been subjected to a revision by Mr. Philip 
Lake, M.A., F.G.S., and myself, 
AGNOSTUS TRISECTUS, Salter. 
1864. A. trisectus, Salter, Mem. Geol. Surv. dec. xi, p. 10 & pl. i, fig. 11. 
1864. A. princeps (pars), Salter, ibid. p. 1, pl. 1, figs. 1-5. 
18—. A. Turneri, Salter MS. Cat. Cambr. & Sil. Foss. Mus. Pract. Geol. p «12. 
1880. A. trisectus, Tullberg, ‘ Agnostus-Arterna, Sver. Geol. Undersékn. ser. C, 
no. 42, p. 24 & pl. i, fig. 13. 
After having examined all the specimens of Agnostus from the 
Malvern Black Shales in the Woodwardian Museum, Cambridge, 
the Museum of Practical Geology, Jermyn Street, and the University 
Museum, Oxford, we have come to the conclusion that all, or at least 
all that are identifiable, must be referred to the species described 
1 Lat. assula = splint. 
2 Novak, Abhandl. d. k. Bohm. Gesellsch. d. Wissenschaften, ser. 7, vol. iv 
(1891) p. 27. 
% Sveriges Geol. Undersdkn. ser. C, no. 112 (1893) p. 76. 
