8 



Ceramoporella okioensis (Nicholson). — Three or four examples of this species 

 were found growing over the zoaria of Homotrypella in the Streetsville member. 

 In the Cincinnati basin it is a long-ranging fossil and is therefore of little use for 

 purposes of correlation. See Plate V, Figure 11. 



Constellaria cf. limitaris (Ulrich). — A small piece of a ramose species of 

 Constellaria, measuring one-half inch in length, was found among the collections 

 of the University from Streetsville. It resembles C. limitaris of the Ohio Rich- 

 mond more than any other form, but a definite determination of the species 

 cannot be made until better material is found. The stratigraphic level from 

 which it came cannot be determined. See Plate VI, Figure 6. 



Constellaria polystomella, Nicholson. — This species is found in abundance 

 in the Columnaria reef at the base of the Meadowvale member. It is an interest- 

 ing fact that C. polystomella as well as Rhombotrypa quadrata have not yet been 

 found at a lower horizon than this on the Credit river, although in the Cincinnati 

 basin and on Manitoulin island they are found throughout the Richmond. 



Fenestella sp. — One poorly preserved specimen, probably referable to this 

 genus, was found in the Columnaria reef in the Meadowvale member. 



Eridotrypa cf. simulatrix, Ulrich. — A form which is here referred with some 

 doubt to E. simidatrix was found in the Erindale and the Streetsville members. 

 The ramose zoaria vary in diameter from two to four millimetres and have low 

 monticules, consisting of average-sized zooecia, scattered evenly over their 

 surfaces, with an average distance of two millimetres between them. The 

 internal characteristics, as shown by tangential and vertical sections, agree 

 fairly well with the type, except that the acanthopores cannot be clearly seen. 

 They are apparently extremely small. According to Shideler, E. simulatrix 

 ranges from the Lower Arnheim to the Lower Whitewater in Ohio. See Plate 

 VII, Figure 6. 



Ilallopora aequalis, sp. no v. — See page 19. 



Hallopora maculosa,' sp. nov. — See page 20. 



Ilallopora cf. onealli (James). — A small form which occurs in the Erindale 

 member and in the Columnaria reef of the Meadowvale member, appears to 

 be closely related to H. onealli of the Eden shales of Ohio and the Indian Ladder 

 shales of New York. Satisfactory sections could not be prepared, owing to the 

 poor state of preservation in which the fossils were found, and definite specific 

 determination is therefore impossible. A very similar form has been found in 

 the Humber River section at Toronto. See Plate VII, Figure 3. 



Hallopora onealli creditensis, var nov. — See page 20. 



Ilallopora cf. rugosa (Milne-Edwards and Haime). — Two examples of a 

 small, ramose bryozoan were found in the Streetsville member, which possess 

 the prominent, ridged monticules of Hallopora rugosa of the McMillan formation 

 of Ohio. As good sections of it could not be prepared, its reference to the 

 above species and even to the genus Hallopora is somewhat doubtful. Cumings 2 

 describes a similar species from the Whitewater member of Indiana, which he 

 also ascribes to II. rugosa. See Plate VII, Figure 7. 



Ilallopora subnodosa, Ulrich. — This species occurs in the Strophomena 

 varsensis zone of the Erindale member, in association with Hallopora onealli 



2 32nd Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 793, pi. 10, fig. 2; pi. 27, figs. 

 14, 14a. 



