Polytremacis and the Ancestry of Helioporiclce. 



301 



Synonymy^ — Heliopmo blainvilliana, ^mr^^, Quenstedt, 1880. 'Petref. 



Deut.,' vol. 6, Part 11, p. 901, Plate 

 178, fig. 30, noil 30x. 

 Quenstedt, 1885. ' Handb. Petref.,' 

 p. 997, Plate 80, fig. 28. 



CJmraders. — Calicles widely separated. They are from 1*5 to 2 mm. 

 in diameter, and have from 24 to 28 septal processes. (Plate 2, 

 figs. 2-4.) 



Distribution — Turonian. Gosaii, Wolfgangsee, and in Bouches-du- 

 Rhone. 



" Angular Cceca." — von Eeuss [16, Plate 24. fig. 3] has shown some 

 angular caeca, which Lindstrom has referred to as stellate, and different 

 from anything in Heliopora, A very similar arrangement occurs in 

 patches in Heliopora somaliensis (cf. Plate 2, fig. 8&), where it is, how- 

 ever, clearly due to the inclusion of quartz-grains in the coral. The 

 quartz-grains are scattered in patches, which sometimes (as in fig. Sb) 

 cut abruptly across a calicle. In some cases these patches were clearly 

 post-mortem in reference to the adjacent calicles, but were formed 

 diu-ing the life of the corallum. 



Species 3.— Polytremacis macrostoma, von Reuss, 1854. 



Synonymy, — Polytremacis macrostoma, von Reuss, 1854. " Kreid 



Ostalp.," 'Denk. Akad. 

 Wiss. Wien.,' vol. 7, p. 132, 

 Plate 24, figs. 8-10. 

 ,, „ Sardeson, 1896. " Bezieh. 



Tabul," Jahrb.,' Beil. 

 Bd. 10, p. 261. 

 Heliopora „ Milne Edwards and Haime, 



1860. 'Hist. nat. Cor.,' vol. 

 3, p. 232. 



„ blainvilliana, pars, Quenstedt, 1880. 'Petref. 



Deut.,' vol. 6, Part 11, p. 

 901, Plate 178, fig. 30x. 



Characters. — Calicles 3 to 4 mm. in diameter, and surrounded by 

 about 32 septal ridges. ^ Calicles often widely spaced. (Plate 2, fig. 1.) 

 Listrihution. — Turonian. Gosau. 



Species 4. — Polytremacis septifera, n.sp. 



Synonymy, — Polytremacis blainvilleana, von Reuss, 1854. " Kreid. 



Ostalp.," ' Denk. Akad. Wiss. 

 Wien,' vol. 7, p. 131, Plate 24, 

 figs. 4-7. 



2 A 2 



