KONGL. SV. VKT. AKADEMIENS HANDLINGAR. BAND 32. N:0 I. 95 



Propora conferta, var. minima n. 



Pl. IX, figs. 24—26. 



It has grown in disciform flats, with calicles of the most diminutive size, only 0,5, 

 in the whole family. They are perfectly circular, smooth without the least vestige of septa 

 or septal flutings or cannehires. In the narrow tubes the tabulas are regularly horizontal 

 and the coenenchyma is almost vesicidar of equal-sized lamella; without any aculee. 



It has been found in the stratum a near Wisby. 



Propora cancellata n. 



Pl. IX, figs. 27—30. 



Coral forming tuberose masses without epitheca. Calicles a little more than one 

 millira. in size, with crenulated margin, else without septa and in a section deeper down 

 having the calicles quite circular and smooth. The tabuler are regularly horizontal. The 

 coenenchyma is on the surface reticulated with irregular tubuli which, however, do not 

 stretch deeper down, as there is no vestiges of them in a longitudinal section in which 

 the convex laminaä are provided with only a few scattered aculse. In the transverse section 

 (pl. IS, f. 28) there are still vestiges of the tubuli, but I suppose that here, as well as in 

 a few other Plasinoporinaa, there are only the transversally sectioned convex lamellaj which 

 assume a deceiving appearance of tubuli. 



This species occurs in the Lower Silurian beds of Borkholm (i^") 



Propora speciosa. Billings. 



Pl. IX, figs. 40 — 46, pl. X, figs. 1—5. 



1865. Heliolites speoiosns BiLLlNGS. Canadian Naturalist and Geologist, Ser. 2, vol. II, p. 426. 



1866. » » Id. Catal. Foss. Antioosti, p. 30, fig. 13. 

 1889. » » Miller. N. Am. Geol. & Palseontol., p. 192. 



Sorae years ago the State Museum at Stockholm received a typical, well preserved 

 specimen of this species from the late Mr Billings. I will at first describe this specimen, 

 in order to show the identity of specimens from a few other localities. 



The polypary is clavate or pyriform elongated, bearing large calicles all around, a 

 little more than two millims. in diameter. The theca is circular, starforraed, crenulated 

 by twelve angular indentations, continuing downwards as septal ridges bearing short, 

 densely packed spines. The outgoing angle of the wall is at its apex provided 

 with a little rounded prominence, similar to the tops of the baculi which project 

 from the coenenchyma. The septa are in several instances visible (pl. ix, tigs. 42, 44) 

 as diminutive spines close to the theca. The tabul^ are characteristically remote from 



