496 NEW YORK STATE MUSEUM 



Subhorizon of Clonograptus cf. flexilis (Clonograptus bed). Tliere OCCUrS at a locality 



in Rensselaer count}^, about 4^ miles due east from the city of Albany, in a 

 small road metal pit on tlie road between Defreestville and West Sandlake, 

 a yellowisli weathering sandy slate, interbedded in light greenish and darker 

 silicious slates, which contains a faunule that indicates the presence of a 

 subhorizon of the Tetragraptus beds lying below the first graptolite bed 

 observed at the Deep kill. 



The faunule, which was discovered by Professor Dale (his locality 154, 

 the material being in the National Museum) is unfortunately represented by 

 small drifted fragments only, and the present writer has been unable to secure 

 more favorably preserved material. It consists of 



Dictyonema murrayi Hall c 



Clonograptus cf. flexilis Hall cc 



Tetragraptus quadribrachiatus Hall c 



T. serra Brongniart c 



c=common cc=very common 



This faunule consists of two species of Tetragraptus, common in the 

 Tetragraptus zone of the Deep kill, and of two species which are entirely 

 absent at the Deep kill. One of these, Dictyonema murrayi, is 

 recorded by Hall as occurring "in hard shales" associated with Clono- 

 graptus rigidus and two other very robust species of Dictyonema, viz 

 D, irregularis and D. robusta. There appears, hence, also in the 

 Quebec region an association of a Clonograptus with Dictyonemas with 

 remarkably robust rhabdosomes. It is quite probable that both these 

 faunules represent the same subhorizon, the exact taxonomic position of 

 which is at present unknown. On account of the frequency of the Clono- 

 grapti, this subhorizon is however to be considered as forming a part of the 

 Clonograptus beds and as lying in the lower part, or perhaps at the base, of 

 the Tetragraptus beds. 



c Zone with Didymograptus bifidus, Phyllograptus typus and Ph. anna. 

 This zone at the Deep kill comprises a considerable thickness of rock, 

 containing numerous graptolite-bearing surfaces which, in the former paper, 

 were divided into graptolite beds 8, 4 and 5. The fauna, consisting of 28 



