297 
INSERT-ffi SEDIS. 
TBACKS AND MABKINGS. 
Abenicolites, Salter,* PI. 8, figs. 2 and 3. 
Ohs. The late Mr. James Smith found in the Stauwell Building-stone, a 
number of vertical tubes, with trumpet-mouth-shaped openings, the resemblance of 
which to Salter’s Arenicolites he called attention to on the labels of his specimens. 
The tubes are vertical, straight, and at right angles to the bedding of the 
ferruginous sandstone in which they occur, sometimes single, at other times in pairs. 
When double they are parallel to one another, one end of each tube cxpandiug into a 
trumpet-mouth-shaped aperture. The walls, internally appear to have been concentri- 
cally ridged, when the sediment with which they have been filled is removed. The 
latter is of a finer consistency than the surrounding matrix, and of a difEerent shade of 
Colour. 
The tubes of the Stanwell Building-stone are much larger than those of the 
English Cambrian rocks, described by Salter, but they more closely resemble, both in 
size and appearance, others from the Durness Limestone, f figured by the same Author. 
The nature of these burrows is extremely doubtful, but I do not believe in the 
theory which ascribes them to the action of worms. That they are the burrows of some 
Buimal is unquestionable, but au explanation should be looked for amongst the 
Mollusca rather than the Annelida. Very similar burrows are produced, for instance, 
ty the Eazor-fish (Solen). They do not partake of the nature of those elongated 
tubes for which Prof. James Hall suggested the name of Scolithus. 
Loo. and Horizon. Stanwell Building-stone, near Kockhampton (The late 
James Smith) — Gympie Beds. 
Bueeows. ? 
PI. 8, fig. 4 ; PL 39, fig. 1 ; PI. 44, figs. 15-18. 
Ohs. I am indebted to Mr. C. W. de Vis, of the Queensland Museum, for the 
peculiar bodies about to be described. They occur in a shale which has undergone 
much alteration, and become exceedingly hard, brittle, and cherty, and they further 
present a different appearance as they are seen in this matrix, or its weathered and 
semi-decomposed equivalent. I have not been able to absolutely detect the bedding in 
this rock, but appearances point to these markings being parallel to it, or, perhaps, 
cutting it at au oblique angle. In the decomposed material they present the appearance 
straight or slightly-cuiwcd tubes, which dilate somewhat at their distal ends, or 
enlargements may take place during the course of the burrow. These passages are 
filled with a material resembling the surrounding matrix in colour and consistence, but 
broken up into segments, or divided into a series of infundibuliform divisions after the 
manner of the chambers of a multilocular shell. In this condition these curious 
remains appear under two aspects — First, as infilled tubes preserved in the round, 
each segment fitting into its neighbour, and weathering out separately one from the 
other: Secondly, when the surkce of the matrix has been removed by weathering, 
I'fie outline of the tube is destroyed, but the segments are left in relief as a number of 
filsjointed and apparently moniliform bodies, and in this condition resembling many 
tracks, which have from time to time been erroneously referred to worms and other 
improbable organisms. 
* Quart. Journ. Geol. Soc., 1859, xiii., p. 204. 
t Loc. cit, 18.59, XV., t. 13, f. 29 and 30. 
