Measurements. 



Mm. 

 f Anteroposterior 11 



I 

 Diameters of centrum -J Vertical 24 



[Transverse 25 



The second centrum is perhaps caudal, as it resembles those of Amiurus in having a 

 lateral fossa below as well as above the median lateral portion. The latter is coarsely 

 reticulate cancellous, and a deep fossa separates the two ridges which represeut the bases 

 of either the neural or the haemal spines. The anteroposterior diameter is relatively greater 

 than in the vertebra last described. 



Measurements. 



Mm. 

 [ Anteroposterior 12 



Diameters of centrum -| Vertical (restored) 28 



I 



{ Transverse 23 



Amiurus maconnellii. Sp. nov. 



This species appear to have been larger than the last. It differs from it in the 

 much finer cancellation of the lateral surfaces, over which the articular dense layer is 

 much less reverted. Instead of a cancellated tract between the diapophysis and the 

 neural spine, there are two deep fossse, and there are two large shallow fossse on the 

 inferior face instead of one deep one. Near the articular borders a few cancellous lines 

 are vertical in direction. The species presents some of the characters of the Rhineastes 

 rlwsas. Yertebrse, only, of this species were found. They indicate large size, the measure- 

 ments being : 



Mm. 

 f Vertical 40 



Diameters of centrum -j Transverse 38 



( Anteroposterior 14.5 



This centrum has a subquadrate outline, so far as can be determined in the absence 

 of the superior border. It has a minute transverse notochordal foramen. The diapophysis 

 is rudimental and superior in position ; it presents no articular facet. Both above and 

 below it, is a shallow fossa. Except a pair of shallow fossse on the inferior face, the lateral 

 walls are without fossse, but are finely impressed with minute longitudinal pits. 



A second centrum, probably caudal, belongs to a still smaller individual. Its outline 

 is subpentagonal, the apex inferior and without a single median fossa. No diapophyses. 

 Three superior fossae — one large median and a smaller one on each side. Minute pits of 

 external walls sub-round. 



Mm. 

 f Vertical 21 



Diameters \ Transverse 21 



I 



[Anteroposterior 7.5 



This catfish equalled in dimensions the large A. nigricans of the Mississippi. It is 

 dedicated to the able geologist Mr. R. G-. McConnell, of the Dominion Survey. 



