244 TRANSACTIONS, NATURAL mSTORT SOCIETY OP GLASGOW. 



Couodouts, with thi'ee plates of forms from the Cambro-Silurian 

 and Devonian strata of the United States of America.* 



In the Transactions of this Society for 1898-99 (Vol. V., New 

 Series) I figured some Couodouts found by me in the Car- 

 boniferous rocks of Scotland, with descriptions by Dr. G. J. 

 Hinde (two plates). 



DESCRIPTIONS OF THE ARENIG-LLANDEILO 

 CONODONTS OF THE SOUTHERN UPLANDS OF 

 SCOTLAND. 



Figs. 17, 18, 19, Plate VI., may be parts of annelid jaws, 

 but are evidently referable to Pander's genera, Machairodus and 

 Drepanodus. 



The cross-bars on some of the teeth may have been caused 

 by shrinkage cracks. 



All the figures are enlarged 40 diameters, with the exception 

 of Figs. 17 and 48, which are 20 diameters. 



Centrodus erectus, new species. 



On a simple straight or curved beam a number of teeth staud 

 at right angles, but much wider apart than in Pander's 

 C. lineatus ; Plate V., Figs. 1, 2, 4, 5. 



Localities. — Hunt Law Cleuch, Snar Water, near Wanlockhead, 

 in chert-shale; Ravengill, in Gleucaple, Abiugtou, in shale next 

 chert. 



Centrodus obliquus, new species. 



From a simple beam, straight teeth project at an oblique 

 angle; PI. V., Fig. 3. 



Locality. — Hunt Law Cleuch, Snar Water, Wanlockhead; in 

 chert-shale. 



Centrodus distans, new species. 



On a straight beam a few simple conical teeth stand at right 

 angles and some distance apart; PI. V., Fig. 7. 



Locality. — Ravengill, in Gleucaple, Abington; in shale next 

 chert. 



* Quar. Jour. Geol. Soc, August, 1879. 



