424 



THE GEOLOGIST. 



Mr. Salter to be identical with the Pamdoxides Forclihammeri of 

 Angelin from the alum-shales of Andrarum, in Scania. 



Lign. 9. — Pababoxides 

 FOBCHHAMMEBi (? Angelin) 

 from the figure in ' ' Siluria' ' 



of the specimen in the Mu- 

 seum of Economic Geo- 

 logy, Jermyn-Btreet. 



Although but little known in the English strata, these little Ag- 

 nosti are, according to Brongniart, so abundant in the beds near 

 Heltris, in Sweden, as to give an oolitic character to the rock. 



Remains of a phyllopod or stomapod crustacean, Hymenocaris ver- 

 micauda, occur plentifally in the beds with Lingula Bavisii at Dol- 

 gelly and Tremadoc, where so-called tracks of annelides, sometimes 

 of considerable size, are also stated to be met with. 



Lign. 10. —Htmen-ocaeis 

 VEBMiOATTDA. From the 

 restored figure by Mr. 



Salter in "Siluria." 

 From specimens from 

 Dolgelly. 



Some caution may be necessary in speaking of such fossils as 

 worm-tracks ; for although no remains of Olenidse have as yet been 

 found in these " track-mark" beds, yet as those trilobites are found 

 in strata of equivalent age, it is quite possible that they existed on 

 these shores when these Silurian sediments were formed. And as 

 Mr. A. Hancock has shown in his valuable paper on Vermiform- 

 fossils, in the " Annals of Natural History" for 1858 (3rd series, vol. 

 ii , p. 443), that some of the so-called annelide-tracks have been 

 formed by small burrowing crustaceans, it is quite possible that we 



