188 



THE GEOLOGIST. 



man's bait. We have noticed this last point not from any desire to 

 invahdate lir. 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 Falceapyge 



Lign. 3. — Ptgidium of Trilobite, Palceopyge Ramsayi, Salter. 

 From CaUow HiU, Little Stretton. (From Plate IV. vol. xii. Quart. Joum. Geol. Soc.) 



Ramsay i, and allied to the Dikelocephalm Minnesotensis described by 

 Dr. Dale Owen, from the Minnesota Territory, United States. The 

 most intelligible of these fragments is a r.ortion of the pygidium, 

 or caudal extremity, 2\ inches broad, and |ths of an inch long, 

 the equivalent of the part marked 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 Palgeorchorda 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 



