P. E. Raymond — Fauna of the Chazy Limestone. 357 



Thus far, the following fossils have been found only in this 

 division, and most of them in but one locality : Camarotmchia 

 pristina sp. no v., Ctenodonta dubiaformis sp. no v., Clidoph- 

 orus obscurus sp. nov., Cyrtodonta expansa sp. nov., Endo- 

 desma unduloMim sp. nov., Scenella robusta sp. nov., R aphis - 

 toma undulatum sp. nov., Helicotoma vagrans sp. nov., 

 Bucania bidorsataf, Trochonema dispar sp. nov., Subuliies 

 prolongata sp. nov., Holopea scrutator sp. nov., Eoharpes 

 ottawdensis, Asaplms marginalis, Isotelus angusticaitda, Isot- 

 elusf bear si, llloznus punctatus, Cybele valcourensis, Cer au- 

 nts pompilius, C. hudsoni, and Pseud osphwrexochus approx- 

 imus. 



This middle division is marked by an abundance of pelec- 

 ypods, gastropods, and trilobites, and in this respect is sharply 

 contrasted with the lower division. Of the 16 pelecypods, 13 

 are represented here. Of 35 trilobites, 27 are present. 



Species of Stro?natocerium and Strephochetus are common 

 in these rocks, but are also abundant in the lower zone of the 

 next division. 



Zone 2 a . The Malocystites murehisoni zone. Thus far, 

 only one subfaunule has been detected in Division 2, and that is 

 at the very base. It is best develoj)ed at Valconr, but occurs 

 also on Yalcour Island. The zone is characterized by the great 

 abundance of cystid fragments. The characteristic fossils are : 

 Glaphurus primus, Eoharpes antiquatus, Lonchodomas halli, 

 Cybele valcourensis, Malocystites murehisoni, M. emmonsi, 

 Glyptocy stites forbesi, Palasocystites tenuiradiatus, Raphis- 

 torna stamineum, Maclurites magna, Plcesiomys strophome- 

 noides, and Camarella varians. 



Division 3. The Gamarotozchia plena Division. — The 

 strata of this division are rather thin bedded, light grey, coarse- 

 grained limestones, abounding in fossils. Near the base there 

 are always buff-colored, pure, fine-grained dolomites and heavy 

 bedded, coarse-grained bine limestones. The only fossil which 

 is found throughout this division is Camarotmchia plena. 

 Other characteristic fossils are : Camarotoechia major sp. nov., 

 Orthis igniada sp. nov., Mo diol op sis fab of or mis sp. nov., and 

 Glaphurus pustulatus. 



There is here a decided falling off in the number of gastro- 

 pods and pelecypods, only 6 of the former and 5 of the latter 

 being represented. There are about as many trilobites (16) in 

 this division as in Division 1, and 8 of these are found in all 

 three sections. The number of species of brachiopods is about 

 the same in each of the three divisions, but they dominate the 

 fauna in the first and third. In the former, one of the Pro- 

 tremara (Heberlella) is most abundant, while in the third divi- 

 sion one of the Telotremata (Camarotoschia) predominates. 



Am. Jour. Scl — Fourth Series, Vol XX Xo. 119 — Xovember, 1905. 

 25 



