136 PALEONTOLOGY OF ONTARIO. 



151. Strophostylus ? obliquus, Nidi. (C.) 



152. Holopea Eriensis, Nich. (C.) 



153. Helicotoma? serotina, Nkh. (C.) 



VIII. ANNELIDA. 



The remains oi Annetidou, thougli far from uncommon in the Devonian 

 Hocks of Ontario, are entirely referable, so far as my observation 

 has gone, to the genera Spirorbis and Ortonia ; though there are not 

 "wanting indications of the occurrence of genuine Serpulce or Vermilice. 

 Of the two species of Spirorbis which have come under my notice, 

 one is the S. omphalodes of G-oldfuss, a form which occurs in the 

 Devonian Rocks of Europe, whilst the other I cannot indentify at 

 present with any recorded form, and have, therefore, described as 

 new under the name of S. Arkonensis. The genus Ortonia, which I 

 established for some Tubicular Annelides from the Lower Silurian- 

 Rocks, and which has since been detected in the Carboniferous Rocks 

 of Scotland, is represented by a single new species. 



List of Devonian Annelida. 



154. Spirorbis omphalodes, Goldfuss (H. & C.) 



155. " Arkonensis, Nich. (H.) 



156. Ortonia intermedia, Nich. (H.) 



IX. CRUSTACEA. 



The remains of Crustacea are by no means uncommon in both the 

 Corniferous Limestone and the Hamilton group of Ontario ; but 

 they are for the most parlr ill-preserved and fragmentary, and I have 

 only been able to identify with certainty the following species, already 

 well-known from the Devonian Rocks of the State of New York. 

 Besides these, our collections include fragments of some five or six 

 additional spegies of Trilobites, which I am at present unable to 

 satisfactorily identify. 



List of Devonian Crustacea. 



157. Proetus crassimarginatus, Hall (C.) 



158. Dalmanites Boothii, Green{]l.) 



159. Phacops rana. Green (C. & H.) 



160. Cy there (?)>unctulifera, Hall (H.) 



