62 G. LINDSTRÖM, HELIOLITID^. 



for instance between tigs. 28, 30, pl. iii, f. 2, pl. iv on the one side and figs. 5 and 8, 

 pl. IV on the other. But now calicles of the first type may be found on the surface of 

 the same polyparium together with calicles of the second type, in which also the reticula- 

 tion is more or less complicated or in other words variable. So in the Bohemian, as well 

 as in the Gotlandic specimens. I therefore cannot agree with Wentzel in considering 

 the reticulated specimens as so highly differentiated as to justify their being removed into 

 a separate generic type, called Stelliporella. As the chief and only distinguishing character 

 of this genus can be shown to be highly variable and as for the constituting of a néw 

 genus must be wanted more than a single character and that too of constant value, I 

 should at the highest attribute a varietal value to the Stelliporella-specimens. 



From Heliolites Barrandei, the only one, with which it could be confounded, it is 

 distinguished in the following manner. 



Hel. Barrandei. Pen. Hel. parvistella. F. Roemer. 



Septa not attaining the centrum of the calicle, Septa long, meeting in the centre of the 

 at the edges bent upwards in spines. calicle, where they intercross and form 



a more or less complicated reticula- 

 tion. 

 Tabulfe irregalar, as it were, broken up 

 between the loculi and curved upwards 

 or convex. 



Distribution. In Gotland it is one of the most common species and has been found 

 in all strata. In the bed a, the Arachnophyllum stratum near Wisby, though not so common 

 there as in the next superjacent beds be, from Stora Carlsö, Westergarn, Petesvik in 

 Hablingbo, Sproge, Stenbro å, Djupvik in Fröjel, the canal from Wisne myr in Fardhem, 

 Asax"fve in Hemse. 



In the stratum d at Wisby, Stjernarfve in Eksta, Östergarn, Ryssnas in Fårö. In 

 the stratum / at Lau, Burs, Klinteberg, Sandarfve kulle, Fröjelklint, Lilla Carlsö, Follingbo, 

 Wisby, the hill of Bara, Simunde in Bara, Slite, Klints in Othem, the shore of Boge, 

 Tjelders in Boge, Kylley, Hidevik, near Bunge church. Also found in the Leptsena limestone 

 of Dalecarlia in a few specimens at Östbjörka. 



Its geographical distribution out of Sweden is also wide. The Swtdish State Museum 

 is in possession of specimens from the isle of Malmö near Christiania in Norway, from 

 Kozel in Bohemia, from Dudley in England, from Louisville and the falls of Ohio' in N. 

 America, and from Pattakumäggi in the Island of Oesel, Russia. F. Roemer found it in 

 erratic blocks at Sadewitz in Silesia, which are derived from the uppermost beds of the 

 Lower Silurian of Esthonia. 



Tabute regular, horizontal but scarce. 



