graphic range of each, both in the Credit Valley basin and at points out- 

 side of it. 



The total fauna consists of 101 species or varieties, of which 46 are Bryozoa. 

 This feature constitutes one of the strongest peculiarities of the fauna. Next 

 to the Bryozoa, the Pelecypoda are most abundant, with 22 species. The 

 remaining fossils are in-order of importance as follows: Brachiopoda, 12 species; 

 Gastropoda, 8 species; Anthozoa, 5 species; Nautiloidea, 2 species; Trilobita, 

 2 species; Hydrozoa, 1 species; Echinodermata, fragments of 2 genera; Incertae 

 sedis, 1 species. At least three-quarters of the total fauna is from the Richmond. 



Of the above 101 species or varieties, 23 are described as new; of the Bryozoa, 

 13 species and 7 varieties; and of the Brachiopoda, 1 species and 2 varieties. 



Hydrozoa 



Stromato cerium huronense (Billings). — This species is very abundant in the 

 Stromato cerium reef of the Streetsville member and in the Columnaria reef of 

 the Meadowvale member. In some cases it forms masses as great as eight 

 inches in diameter. As this species is known to occur at different horizons in 

 the Richmond, it is of no particular formational significance. 



Anthozoa 



Calapoecia huronensis, Billings. — Foerste 1 in reference to this species, 

 states that C. cribriformis , Nicholson, appears to be identical and that Nicholson's 

 name should be abandoned, an opinion endorsed at a later date by that author 

 himself. 



Foerste records this species from a locality on the Credit river which seems 

 to accord with the section in the Meadowvale member just above Castler's 

 bridge. A fine specimen from Streetsville is in the collections of the University, 

 but its exact stratigraphic level is not indicated. No further examples were 

 found. 



Columnaria alveolata, Goldfuss. — This coral occurs abundantly in the 

 Columnaria reef of the Meadowvale member, and sparingly in the upper part 

 of the Streetsville. The range of the species is long but it is most abundant 

 elsewhere in the Saluda division. 



Columnaria calicina, Nicholson. — On the Credit this species is found in the 

 Columnaria reef and sparingly in the Stromato cerium reef. In other parts of 

 Ontario, it is most abundant in strata correlated with the Whitewater, only 

 one occurrence being recorded from rocks below this horizon (Waynesville of 

 Manitoulin island). According to Foerste the species occurs in the Cincinnati 

 basin at the base of the Liberty. 



Streptelasma rusticum, Billings. — Foerste records the occasional occurrence 

 of small examples of this species (one-quarter inch long) on the Credit at an 

 outcrop above Castler's bridge (Meadowvale member). The species is .common 

 in all the divisions of the Richmond in Ohio and Indiana, and on Manitoulin 

 isla d. 



Tetradium approximatum, Ulrich. — Abundant in the Columnaria reef and 

 in the Stromatocerium.reei. Coralla as great as 18 inches in diameter are some- 

 times found. This fossil has frequently been ascribed to T. minus described 

 by Safford from the Trenton of Tennessee, but it agrees more closely with T. 

 approximatum, the common species of the Ohio, Indiana, and Ontario localities. 



1 Bull. Sci. Lab. Denison Univ., 14, 1909, p. 310, pi. 11, fig. 4. 



