and the New Genus P rotistograptus. 55 



It is evident that at St. Jolm and Levis some D. oifidus 

 zone fossils occur at a lower horizon than in the Deepkill and 

 European localities. At St. John, this may be explained by 

 the existence of a transitional fauna. At Levis, however, they 

 occur in a zone which does not overlie a normal Tetragraptus 

 fauna, and consequently there they may actually exist in 

 Tetragraptus time and not, as at St. John, at a possibly some- 

 what later time. 



The St. John graptolite fauna differs considerably from that 

 at Levis, only seven species being common to both, while nine or 

 ten of the St. John species are not found at Levis and about the 

 same number of Levis forms are absent at St. John. The 

 faunal content of the St. John beds indicates a closer relation 

 with northwestern Europe than with any American localities. 

 The characteristically non- American species are D. simulans, 

 D. v-fractus, D. acutidens, and I). hirnndo. 



Conclusions. — The study of the graptolite fauna under con- 

 sideration shows that 



(1) Two subhorizons are present, which, however, may be 

 only of local importance. 



(2) The lower subhorizon holds the time of the Tetragraptus 

 zoue, and the upper is transitional toward the D. oifidus zone. 



(3) The faunas all show greater affinity with those of north- 

 western Europe, especially with the Lake District of England 

 and St. Davids and Carmarthenshire, Wales, than with Que- 

 bec or New York faunas. 



(4) The succession shows that the Suspension Bridge slates 

 are not overturned, but upright. 



Notes on the Gkaptolites. 



Dldymograptus acutidens Lap worth, new var. 



The form present at St. John differs from Lapworth's spe- 

 cies in having the proximal thecse turned upward and only in 

 contact for a small portion of their length. The distal thecae 

 have the normal characters of the species. This is probably 

 a close variety of Lapworth's species. 



Protistograptus, new genus. 



Cyrtottieca Matthew (not Salter), Nat. Hist. Soc. New Bruns- 

 wick, Bull. No. 10, 1892, p. viii. 



Creseis Matthew (not Rang), Trans. Roy. Soc. Canada, vol. 10, 

 sec. 4, 1892, p. 104. 



An arched or straight cone, apex pointed, and the aperture 

 terminating in a spine. The wall is carbonaceous, probably 

 representing an original chitinous periderm. The cone is 

 thought to be homologous with the sicula of all graptolites, and 



