60 G. LINDSTRÖM, HELIOLITID^. 



Heliolites Barrandei, varietas spongodes n. 



Pl. III fio-. 13—16, pl. IV, f. 1. 



1880. Heliolites inicropora NiCHOLSON & ETHERIDfiE. Girvan p. 245. This is identical with ray var. spongodes, 



which I forraerly had confounded witb Heliol. raicropora ElCHWALD and sent to 

 Prof. NiCHOLSON under that deuomination. Having through tlie kindness of Prof. 

 iNOSTRANZEW been able to examina the original speoimen of ElCHWALD, preserved 

 in the Museum of the University of St. Petersburg, I have found that this is a 

 Coccoseris, which has been described further on in this memoir. 



Mode of growth. Polypary grown in spongelike, irregularly lobate masses expanding 

 from a narrow basis, having short fingerlike processes from the rounded edges, and with 

 calicles on all sides. There are only a few undulating stripes of epitheca formed by and 

 by as the coral has advanced upwards and covering the older calicles. 



The calicles are extremely small, scarcely 0,5 millim. in diameter. Their theca is 

 slightly prominent, very little indented. 



The seijta are of unequal size, some reaching to the centre, where a few detached 

 tubercles fill the space, being the ends from lower situated septal spines. The septal 

 laminae are, quite as in the typical species, split up in narrow, upwards curved spines, 

 enclosed by the horizontal and distantiated tabulaä. 



The coenenchyma consists of Yevy small and narrow polygonal tubes. 



This very characteristic and distinct local variety occurs only in the strata b — c in 

 the Wisby region, seldom in the lowest beds of d, and ranges from Wible, past Wisby, 

 Snäckgärdet towards Likkershamn. Only one specimen has been found in the stratum c 

 at Djupvik in Eksta and nowhere else. 



Another variety of a singular mode of growth has been found in the uppermost strata 

 of Sandarfve kulle. Pl. iv, fig. 1. It has grown in narrow branchlets of a width of 4 — 5 

 millims. The calicles are totally concordant with those of the genuine Heliolites Barrandei 

 and occur on all sides of the polyparium. It reminds somewhat of Heliolites inordinatus 

 LoNSDALE (British Fossil Corals, p. 253, pl. 57, fig. 7) but this has more slender, regularly 

 cylindrical branchlets and the calicles have, to judge by the figures, longer and more 

 regular septa. 



Heliolites parvistella. Ferd. Roemer. 

 Pl. III f. 28—31, pl. IV f. 2—9. 



1861. Hel. parvistella Ferd. Roemer. Sadewitz, p. 25, Tab. IV, f. 6. 



1878. Hel. conf. Miirohisoni QuBNSTEDT. Petrefakten kunde, p. 143, pl. 148, fig. 29. The appearance of the 



calicles make it probable that this is identical, but a longitudinal section is wanted 



to make it certain. 

 1880. Hel. interstincta NiCHOLSON & EtheridGE. Girvan, p. 254, pl. XVI, tig. la, 2a — 2ä cet. excl. 

 1880. Hel. interstinctus, var. lamellosus LiNDSTR. Fragmeutn Silurica, p. 32, Tab. I, hg. 5. 

 1883. Hel. parvistella Ferd. ilOEMER. Lethaea geogn., p. 506. 

 1888. Hel. inordinatus LiNDSTR. Fossil Faunas of Sweden, II, p. 21. 

 1895. Stelliporella lamellata WenTZEL. Tabulaten, p. 34, Tab. IV, fig. 10 — 12. 

 1895. Heliol. parvistella II). Ibid., p. 29. 



