160 



same small piece of limeslone as the type of Trichospongia hystrix. Mr. 

 Schuchert, who has seen this starfish, in a letter to the writer dated Jan. 

 21, 1897, states that "it cannot be described specifically, but that gen- 

 erically it appears to be a Toeniaster." 



VERMES. 



ANNELIDA. 



Serpulites dissolutus, Billings. 



Serpulites dissolutus, Billings 1862. Geol. Surv. Canada, Pal. Foss., vol. 



I., p. 56. 



Punk Island, Lake Winnipeg, Professor H. Y. Hind, 18.58, an imperfect 

 but fairly well preserved specimen, which seems to be essentially similar 

 to the types of S. dissolutus in the Museum of the Survey. It is about 

 an inch and three-quarters in length, but imperfect at both ends, and 

 one millimetre and a half in its maximum breadth. The surface of 

 <S. dissolutus was described as apparently smooth, but, when examined 

 with a lens the " elevated wire-like margin on each side of the central 

 depression " of the specimen from Punk Island is seen to be marked with 

 minute transverse undulations, which are not so clearly visible in eastern 

 examples of S. dissolutus. In the twentieth chapter of Professor Hind's 

 Report on the Canadian Exploring Expedition to the Assiniboine and 

 Saskatchewan (page 87) Mr. Billings says that " a small Serpulites 

 appears to be common at Punk Island ; it much resembles the large 

 species of the Chazy limestone," but this chapter was written four years 

 before S. dissolutus was described. 



Arabellites. (Species undeterminable.) 



Little Black Island, Lake Winnipeg, J. B. Tyrrell, 1889 : a well- 

 preserved portion of a jaw. This specimen has been kindly examined by 

 Dr. G. J. Hinde, who has made a special study of the teeth and jaws of 

 the Annelida of the Palaeozoic rocks, and who thus reports upon it in a 

 letter to the writer dated June 22nd, 1894. " It is too fragmentary for 

 positive determination, but it seems to have had a prominent anterior 

 hook, about half of which remains, and a long row of subequal minute 

 teeth on the crest of the plate. So far as I can judge, it belongs to the 

 genus Arabellites, forms of which are figured in the Quarterly Journal of 

 the Geological Society of London, vol. xxxv., pi. 18, figs. 13-19, also in 

 vol. xxxvi., pi. 14, and in the Transactions of the Royal Swedish 

 Academy of Science, Sept. 13, 1882 (Kongl. Sv. Vet. Akadem. Handl., 

 Band 7, No. 5). But the portions wanting in your specimen prevent 

 any close comparison with the forms already described." 



