CONODOXTS IN ARENIG-LLANDEILO FORMATIONS. 249 



Prioniodus hiflatus, new species. 



Spike obliquely set to the lieam, and with a spur near the 

 middle, the parts above and below the latter being of equal 

 length. The beam carries a large number of short teeth, and at 

 least five inflated ones are interspersed at about equal distances 

 apart. The specimen is probably not complete; PI. VIII., Fig. 36. 



Locality. — Ilavengill, in Glencaple, Abington; in shale next chert. 



Prioniodus subcompacttis, new species. 



Spike longer than the beam. Beam with four long teeth, three 

 of them closely set together; PI. VIII., Fig. 37. 



Locality. — This minute species occurs in the shale next the 

 chert in Ravengill, in Glencaple, Abington. 



Prioniodus equalis, new species. 



The spike is pretty obliquely set, extends as far below the 

 beam as alx)ve it, and has two spurs at a short distance below 

 the beam. The long, straight beam carries a large number of 

 short teeth nearly all equal in size; PI. VIII., Fig. 38. Fig. 39 

 is probably the same species, but wasted. 



Locality. — Ravengill, in Glencaple, Abington ; in shale next chert. 



Prioniodun curvaius, new species. 

 Spike, beam, and teeth all strongly curved; outside of the 

 spike there is a small tooth ; PI. VIII., Fig. 40. 

 Locality. — Hunt Law Cleuch, near Wanlockhead; in chert-shale. 



Prioniodus Macconochii. new species. 



The spike is obliquely set, and extends as far below the beam 

 as above it. On it there is a spur a short distance below the 

 l^eam. The long, straight beam carries a large number of teeth 

 — fifty to sixty — every third, fourth, or fifth one being much 

 longer and stronger than the rest. On the underside of the 

 beam, opposite the strong teeth, there are sometimes slight, 

 rounded projections; PI. VIII., Figs. 41, 42. 



Locality. — Ravengill, inGlencaple, Abington; in shalenextchert. 



I have much pleasure in dedicating this splendid species to 

 Mr. A. Macconochie, of the Geological Survey, who, by his careful 

 collecting of the fossils of the Southern Uplands of Scotland, has 

 made it possible for the Surveyors to tabulate the older forma- 

 tions of the South of Scotland, and at the same time placed all 



