128 PROF. GROOM ON THE, CAMBRIAN AND [Feb. r902, 
trilobites.'_ The chief reasons for this view are, the nearly constant 
size and shape, the delicate, opaque, external black pellicle, and: 
their frequent association with trilobites; one kind, indeed, is con- 
stantly associated with Phacops fecundus, Barr. Moreover, one group 
of these bodies was found in a head of Barrandia crassa, Barr. 
Barrande distinguishes eggs of three sizes: firstly, those measuring 
4 to 5 millimetres ; secondly, those measuring 2 mm.; and thirdly, 
those not more than # mm. in diameter. The Malvern examples 
agree in size with those of the third group. 3 
In most cases the bodies described by Barrande were spherical, - 
but in many instances they were ovoid or cylindrical. The examples. 
found at horizon d’ near Leiskov and at horizon d’ at Wosek are 
stated to be constantly cylindrical. The. Malvern specimens agree 
closely in form with those in Barrande’s pl. xvii, figs. 31-33. 
The trilobites found.in the Malvern Dictyonema-shales are 
enumerated in the table on p. 110. i 
Despite the uncertainty of the systematic position of the egg-like 
bodies described above, it seems desirable for tue present to recog- 
nize them as distinct forms; and I would propose for them the 
name of Tomaculum problematicum. 
VIII. CorreLation OF THE BEDS DESCRIBED WITH THOSE » 
OF OTHER AREAS. 
(a) The Bronsil Shales. 
‘The Bronsil Shales have long been correlated with the ‘Dictyo- 
nema-beds’ of North Wales and other districts; their resemblance 
to the Shineton Shales, in particular, has been pointed out by 
Dr. Callaway.* Concerning the fossils other than Dictyonema which 
serve for comparison with other areas, the following remarks may be 
made :—Linnarssonia Belti: appears to be confined in. Wales to the 
Lower Tremadoc.? Niobe Homfrayt is apparently found only in 
the Lower Tremadoce, and in the passage-beds between this and the 
Upper Tremadoe.* Lingulella Nicholson, Acrotreta Sabrine (typical 
variety), Parabolinella triarthrus, Agnostus dux, Platypeltis Croftia, 
and Asaphellus affinis are found in the Shineton Shales. Of these, 
the four last mentioned either resemble, or are identical with, 
species occurring in the Ceratopyge-beds of Norway, which are the 
recognized equivalents of the British Tremadoc.’ Asaphellus affinis | 
is found also in the Tremadoc and Arenig of NortheWales; and 
Cheirurus Frederic? is chiefly characteristic of the Upper Tremadoc 
of Wales, but also occurs in the passage-beds between this and the 
. *Systéme Sil. du Centre de la Bohéme’ pt. i, vol. 1 (1852) pp. 276 e7 segq., 
and vol. i, suppl. (1872) pp. 429 et seqg. 
2 Quart. Journ. Geol. Soc. vol. xxxili (1877) pp. 660, 661. 
’ T. Davidson, ‘ Brit. Foss. Brachiop.’ Monogr. Palzont. Soe. vol. iii (1871) 
». 4l: waht 
"4 Mem. Geol. Surr. Gi. Brit. vol. iii, Ind edu (esl soe 
5 W. C, Brégger, Nyt) Mag: for Naturyidensk. vol. xxxvi (1898) p. 194. 
