Vol. 58.] | THE CAMBRIAN, BIC. OF THE MALVERN HILLS. 12Zt 
by Salter as A. trisectus. The species A. princeps appears to have 
been founded upon imperfect specimens of <A. trisectus from the 
Upper Lingula-Flags of Malvern, etc., and of another form (probably 
A. pisifornis) trom the Lower Lingula-Flags of other districts. 
- The foregoing paragraph was written some years ago, and since 
that time Prof. W.-C. Brogger has referred to Agnostus princeps in 
the following terms :— 
‘ Agnostus princeps, Salter, is a species which is supposed to occur both in the 
“Upper Lingula-Flags” and in the (Lower and Upper) Tremadoc. But it 
seems probable that different species have here been included under one name.’ ! 
It will be seen that this conclusion is in harmony with that 
drawn by Mr. Lake and the present writer. It follows that Agnostus 
princeps, which has long occupied a prominent pestiion in our list 
of Cambrian fossils, must disappear. 
(6) Grey Shales. 
Apart from the characteristic Dictyonema sociale, fossils are rare, 
and no trilobites or other organisms have hitherto been recog- 
nized from the Bronsil Shales, with the exception of Platypeltis 
Croftii, Call., and Shumardia salopiensis, Call., both recorded by 
Dr. Callaway. I have recently recognized in the form referred to 
the last-mentioned species the type of a new genus and species— 
Acanthopleurella Grindrodi.? A few other trilobites, for the most 
part fragmentary, are preserved in the collections at Oxford, Jermyn 
Street (London), Malvern, and Worcester; and others have been 
obtained by me. Some of these, to which allusion has been made 
in the text of the paper, are too imperfect for description ; of 
the rest. two have been submitted to Mr. P. Lake, who is jointly 
responsiple with myself for the following notes on Cheirurus Frederict 
and Platypeltis Crofti. 
In the Malvern Collection is a good fragment of the head of the 
imperfectly -known Cheirurus Frederica, Salter (fig. 27), the length 
of which is 5 mm., and the original width probably 16 mm. The 
specimen is found in Grey Shale. 
Cursrurvs Freperict, Salter. (Figs. 27 & 28, p. 120.) 
1862. SarteER, ‘ Brit. Trilob.’ Monogr. Palzont. Soc, p. 74 & pl. v, figs. 18-21: 1866. 
Mem. Geol. Surv. vol. iii, p. 322, pl. viii, figs. 1-3 & text-fig. 10, p. "393. 
Head depressed, crescentic, marginate. Glabella quadrate, much 
narrower than the cheeks, reaching to the front margin; axial 
furrows almost parallel; three pairs of nearly transverse lateral 
furrows. Cheeks wide, scrobiculate. Eyes and facial suture appa- 
rently placed very far forward; consequently the free cheeks are 
extremely small. 
Thoracic axis narrow, about two-thirds the width of the pleuree. 
Pleurz convex, deeply grooved. 
The specimen here described is evidently from the Malvern Grey 
* Nyt Mag. for Naturvidensk. vol. xxxvi (1898) p. 201. 
* Geol. Mag. 1902, p. 70. 
