28 



which are numerous, are found between the junction angles of the walls of 

 the zooecia and strongly inflect the walls. The mesopores are gathered into 

 maculae. 



The features of the species as shown by vertical sections, differ decidedly 

 from those of S. crenulata, and suggest S. catenulata, Cumings and Galloway. 

 The zooecial walls are not crenulated as in the former species but are straight 

 as in the latter. There is also a marked development of chain-like mesopores 

 as in S. catenulata. 



S. hybrida is one of the best-defined species of the genus Stigmatella. It 

 differs quite strongly in growth and in the combination of characters as seen 

 in sections from any other form in the Cincinnatian series. 



Locality. — Cooksville creek. 



No. 12170, Royal Ontario Museum of Paleontology. 



Stigmatella personata lobata, var. nov. 

 Plate VI, Figure 1 



Stigmatella personata, Ulrich and Bassler. Smiths, Misc. Coll., Quart., 47, 1904, p. 36, 



pi. 12, figs. 1-3. 

 Stigmatella personata, Cumings. 32nd Rep. Dept. Geol. Nat. Res. Indiana, 1908, p. 884, 



pi. 24, figs. 3, 3d. 

 Stigmatella cf. personata, Parks and Dyer. Dept. Mines Ontario, Vol. 30, pt. 7, 1921, p. 16, 



pi. 3, fig. 61; pi. 4, figs. 6, 7. 



The original description of Stigmatella personata is as follows : — 



This is one of the non-mesopored species of the genus and forms smooth, branching zoaria 

 very much like 5. crenulata and S. spinosa. From the former it is distinguished by having 

 fewer acanthopores and in lacking the crenulation of the walls in the immature region. From 

 5. spinosa it is separated by its larger zooecia, seven to eight being found in two millimetres, 

 while 10 are required in that species to cover an equal distance. The acanthopores in S. personata 

 also afford a difference, being but seldom more numerous than the junction angles which they 

 usually occupy. In 5. spinosa it will be remembered they are so abundant that they almost 

 completely surround the zooecium. 



A new variety of this species was found among the older collection of fossils 

 at the University. The exact horizon at which it occurs is not known. 



5. personata lobata differs from the type species in the manner of growth 

 and in the character of the surface; it forms an irregular, lobate mass 30 mm. 

 in diameter, with the surface covered by low but conspicuous monticules com- 

 posed of tubes which are slightly greater in size than the average. The speci- 

 mens from the Humber river, ascribed by Parks and Dyer {op. cit.) to 5. per- 

 sonata, are more branching in form than the Credit River variety, but resemble 

 it in the possession of low monticules. 



Locality. — Credit river, Streetsville. 



No. 12171, Royal Ontario Museum of Paleontology. 



Stigmatella sessilis crassa, var. nov. 

 Plate VI, Figure 10 



Stigmatella sessilis, Cumings and Galloway. 37th Ann. Rep. Dept. Geol. Nat. Res. Indiana, 



1913, p. 87, pi. 19, fig. 3; pi. 20, figs. 2-2b. 

 Stigmatella sessilis, Parks and Dyer. Dept. Mines Ontario, vol. 30, pt. 7, 1921, p. 15 (gen. 



ref.). 



