568 TRANS. ST. LOUIS ACAD. SCIENCE. 



Of this species I have only one specimen. It is five centime- 

 tres high, besides the single basal stipe, which is nearly two cen- 

 timetres long. The branches diverge from their initial points on 

 the stipe until the summit is rather more than a centimetre broad, 

 although there are six or seven branchlets present, each having 

 the breadth of a millimetre, and situated about the same distance 

 apart. 



Fonnalion and Locality. — This specimen was found in the Nia- 

 gara dolomite at the "Jolly-cut road,' Hamilton, Ontario. 

 Dendrograptus dawsoni, nov. sp. 

 Plate I. Fig. 5. 



Found erect and tree-like. Stipe short, but extending upward 

 and dividing into two or three principal branches, each bifur- 

 cating twice or thrice, and at the same time giving oft' several 

 slightly diverging branchlets at irregular distances on both sides. 

 The lower part of the stipe or trunk also gives oft' several branch- 

 lets. The outline of the frond is cleft or divided into somewhat 

 rounded lobes, with branches more or less upright. The corne- 

 ous surface is strongly marked with striations. The cellular 

 openings are oval on one side of the axis, as represented in fig. 

 5a. However, there are undulations or swellings on some of the 

 surfaces. 



This little fossil is one of the most beautiful of the Graptolite 

 Family found in the Niagara formation. It is four centimetres 

 high and with a breadth of two centimetres, while the branches 

 are less than half a millimetre thick, and nearly double that 

 distance apart. There is a strong resemblance to D. fructi- 

 cosus of the Qiiebec group. Only one good specimen is in my 

 possession. 



Formaiiofi and Locality. — This specimen was obtained by Col. 

 Grant in the dolomitic shales, below the "cheit bed" of the Nia- 

 gara formation, at the "Jolly-cut road," Hamilton, Ontario. 



Dendrograptus frondosus, nov. sp. 



Plate I. Fig. 6. 



The frond is low and broadly flabellate, originating from a 

 short slender stipe, which divides twice or thrice, after which the 

 divisions extend to the summit of the several lobes, and send oft' 

 branches at irregular distances on both sides. The branches give 



