188 
THE GEOLOGIST. 
man's bait. We have noticed this last point not from any desire to 
invalidate Mr. Salter's determination, but for the purpose of drawing- 
attention to a class of holes which appear to have been hitherto 
totally disregarded by palaeontologists, — I mean those made by the 
long siphons of many of the mollusca. I have frequently detected 
great colonies of Tellens, and other such shells, by the double 
proximate holes formed by their long, slender, siphonal tubes, and the 
inhalent and exhalent currents of water which pass to or from them. 
Mr. Hancock has recently shown many so-called fossil worms and 
worm-tracks to be the trails of Crustacea, and I think at least some of 
the now-considered Arenicolites and worm-burrows will ultimately be 
attributed to some of the mollusca associated with them in the 
same beds. 
The most remarkable of the Church Stretton fossils, however, are 
the few fragments of a Trilobite, called by Mr. Salter Paloeopyge 
Lign. 3. — Ptgidium of Trilobite, Paleeopyge Ramsayi, Salter. 
From Callow HiU, Little Stretton. (From Plate IV. vol. xii. Quart. Journ. Geol. Soc.) 
Ramsayi, and allied to the Bikelocephaltis Minnesotensis described by 
Dr. Dale Owen, from the Minnesota Territory, United States. The 
most intelligible of these fragments is a portion of the pygidium, 
or caudal extremity, 2\ inches broad, and fths of an inch long, 
the equivalent of the part marked p, p", of the American Dike- 
locephalus, fig. 4, p. 189. 
Some obscure traces of sea-weeds, Chondrites, have been found also 
by Mr. Salter at Moel-y-ci, a mountain near Bangor, upon the surface 
of a coarse sandstone ; but these remains are too imperfect for an 
exact description. And two species of PalaBorchorda and two of 
Chondrites have been also described by Professor MacCoy from the 
Skiddaw slates. But with these exceptions, the only other locality in 
which Cambrian fossils have been found is Bray Head, in the county 
