Raymond : Thk Chazv Formation its and Fauna. 



541 



CajHcrella htn^irostris r, 

 Zygospira aciitirostris R, 

 Sceiiella inontrealensis c, 

 Scenella pi'ete/isa r, 

 Bucania sulcaiina r, 

 Raphistoina stainineiim c, 



E line ma lepioiiotum R, 

 Lflphflspira siibahbreviaia c, 

 Alacltiriies magniis r, 

 lllcBiiiis globostis r, 

 Leperditia canadensis r. 



Station Mi^^. These same layers are again exposed west of the 

 ridge where Scalites angitlatus occurs. 'I'he fauna here is : 



Biastiddocrinus expansd^^ c, 

 Alalocystites sp. ind. c, 

 Paleocystites teniiiradiatiis c, 

 Bolboporitcs am erica mis c, 

 Rldnidictya fenestra ta c, 

 PJiylloporina incept a c, 

 Monotrypella sp. r, 

 Lingttla belli r, 

 Crania prona r, 

 Schizainbon ? diipliciinnratiis r, 

 Hebertella exfoliata r, 

 Hebertclla vulgaris c, 

 Canierclla varians r, 

 Zygospira aciitirostris r, 

 Clionychia niarginalis r, 

 Cyrtodonta solitaria R, 

 Archinacella propria x, 



Scenella niontrealensis c, 

 Palccacnicza irregularis c, 

 Raphistoma staminemn a, 

 Raphistoina striatum r, 

 Helicotoma sp. ind. R, 

 Lophospira sp. ind. R, 

 Lophospira subabbreviata c, 

 Eoharpes antiquatus r, 

 Asaphus beta c, 

 I II an us globosus c, 

 Jllce.nus erastusi r, 

 Amphilichas ininganensis R, 

 Pseudospho'rexochus chazycusis r, 

 He Homer a sol R, 

 Splicerexochus parvus r, 

 Leperditia canadensis c, 

 Eurvchilina latiman^inata v. 



^8 Streptelasina expansa Hall, was founded upon a plate of a Blastoidocriniis from 

 this locality. As there appear to be plates of two species of this genus in the Chazy 

 limestone it is probable that Billings' specific name larcharia-'dens can be retained for 

 one species, but Hall's name must be adopted for this one at Chazy. Streph-lasjiin 

 t^xpansa, was the first species described by Professor Hall under his generic diagnosis 

 of Streplelasma, but was not designated by him at the time as the type of the genus, 

 which is fortunate, for if it had been, the genus would have been invalid. Milne 

 Edwards and Haime, and others whose work followed closely upon that of Hall con- 

 sidered Streptelasma corniculttiii to be the type of the genus, and this species was 

 definitely selected as the type by Roemer in 1861, and others. The species Strepte- 

 lasma cornicidum once being selected as the type of the genus, the later references by 

 Hall, 18S6, Scherzer, 1891, Girty, 1894, Winchell and Schuchert, 1895, and Lambe, 

 1 901, to Streptelasma expansa as the type of the genus cannot be considered as hav- 

 ing any effect. In another paper the writer will deal with this subject more fully. 



