GASTRIC TEETH. 195 



further extract from pages 401-2 of the above-mentioned paper, "Figs. 3 — 6 

 represent the teeth of Dithyrocaris collected by Mr. James Armstrong and Mr. J. 

 Bennie from Campsie and East Kilbride, Lanarkshire, and Orchard Quarry, near 

 Thornliebank, Renfrewshire. 



" Mr. Bennie was so fortunate as to obtain, at Lickprivick Quarry, East 

 Kilbride, Lanarkshire, a portion of a carapace (pi. xi, fig. 6), upon the under side 

 of which he discovered the long-looked-for teeth in sUu (figs. 6 a, h). This dis- 

 covery is the more acceptable, because the teeth have never yet been met with at 

 Carluke, where the carapaces are found, although the Carbonifei^ous beds have 

 been diligently searched for fossils by Dr. Rankin for at least thirty years ; whilst 

 the localities already named as yielding the detached teeth do not furnish I'emains 

 of the carapace. 



" The teeth, with one or two exceptions, always occur in ironstone nodules, 



and the best specimens are those which have been weathered out It 



is probable that the soft parts of the animal (which contained the teeth), having 

 been, after death, detached from the carapace, became the nucleus for a concre- 

 tion, such as the phosphatic and ironstone nodules in many other strata. Differences 

 in flotation, and in the force of currents, would account for the scattering of the 

 several parts of the animnl. 



" Mr. Armstrong informs us that the Dlthyrocaris tooth from Campsie (pi. xi, 

 figs. 4 and 4ft) occurs in a bed of black shale, overlying the ' Hosie Limestone' 

 of the Lanarkshire Carboniferous series, which is about 670 fathoms below the 

 ' Ell Coal,' .... the horizon usually taken by the Glasgow geologists in giving 

 the position of Carboniferous fossils. No other specimen is recorded from this 

 locality. 



"Its associated fossils are Nucula gibbosa, JSf. lineata ; Leda longirostris, 

 L. aUenuata ; Nautilus snbsulcatns ; Goniatites Gilbertsoni, Q. vesica; a profusion 

 of Sjnrifera Urei, Orthoceras pygmsenm, and a large Gythere (F). 



" Those from Orchard Quarry, near Thornliebank, Renfrewshii-e (pi. xi, figs. 3 

 a, h, and 5, 5 a), are from a bed of shale about 300 fathoms below the Ell Coal. 

 The common fossils in this bed are several species of Gypricardia, Leda, Grthoceras, 

 Productus costatus, BeUeroplion Urei, B. Leveilleanus, Macrocheihis, Pleurotom.nria 

 moniUfera. No trace of carapace has been discovered at either of these localities. 



" The specimen with the teeth attached to the portion of the carapace, from 

 East Kilbride (pi. xi, fig. 6), was found in shale associated with Brachiopoda, 

 corals, &c. The teeth are common at Orchard Quarry, but only a single 

 specimen has been met with either at Lickprivick or Campsie." 



These teeth, so fully represented in PL XXVI, more nearly resemble those of 

 the lobster than those of Apus in their relative size, solidity, and form (see 

 H. Woodward's paper on " Crustacean Teeth, &c.," in the ' Geological Magazine,' 



