108 G. LINDSTRÖM, HELIOLITIDtK. 



begins. The papillte of this area are of greatly unequal size, some coalesced into larger 

 heaps. They may also be placed in a radiate manner, as if continuations of the septa. 

 The calicular tube contains only vertical baculi (fig. 13) and no tabulaj.^ The coenen- 

 chyma which also consists of baculi has on the surface numeroiis starry pits separated 

 through thick walls, finely grannlated or scrobiculate. In the longitudinal section there 

 are lacunfe, probably caused by dissolution of the sclerenchyma. 



In the fig. 15 Eichwald"s original specimen has been anew delineated in order to 

 show the identity of the other specimens figured. It is preserved in the Geological Museum 

 of the University of Petersburg and through the kindness of Prof. Inostranzeff I have 

 been able to examine it. It is a small thin piece of whitish limestone, much worn already 

 before its being embedded in the limestone stratum during the Silurian period. In com- 

 paring this with other specimens from Estland there can be no doubt but that they all 

 belong to the same species. 



It is known only from Estland where it has been found at Borkholm, Kurkiill and 

 at Maals near Hapsai, the locality of Eichwald's specimen, this probably not in situ. 



Coccoseris megastoma. Mac Coy. 



Pl. XII, figs. 8—11. 



1851. Paleeopora megastoma M'Coy. Brit. Palseoz. Fossils, p. 1(J, pl. ic, fig. 4; not Porites megastoma ArCor, 



Syn. Sil. Foss. Ireland, tab. 4, f. 14, to which M'COY refers, but which is quite 

 difterent. 



1854. Heliolites megastoma M. Edw. & H. p. p. Brit. Foss. Cor., pl. 58, tigs. 2c, 2d. 



1854. » interstincta M. Edw. & H. ibid., pl. 57, iigs. 5c, 5rf probably also belongs to this species. 



It has probably, to judge by a variety described below, grown parasitic as a thin 

 lamella. The calicles are closely set with 1,5 millim. in diameter. The septa are short, 

 broad, triangulär with some irregular tubercles on their surface. The large central area is 

 covered with numerous small papilla3. The coenenchyma is coarsely pitted with narrow, 

 funnelshaped perforations and the separating walls project as blunt spines. 



The figure given is taken from a cast, obtained through an impression of the coral 

 in a piece of slate, found by Lector S. L. Törnquist at Applethwaite in Westmoreland, 

 from where M'Coy as well as Milnk Edwards and Haime also had their specimens, like- 

 wise being negative casts. 



Judging by the above cited figures there cannot be any doubt left of the identity 

 of my specimen with theirs. In Mac Coy's figure the papilla? of the central ai-ea are 

 raore clearly indicated than in those of Milne Edwards. 



With this species I join a variety of smaller dimensions, found in the Swedish 

 Lower Silurian at Hulterstad in the isle of Öland. It has been figured on plate xii, figs. 

 9 — 11. Of the specimens found the best has grown on the calicles of Heliolites hirsutus, 



^ ElCHWALU has in bis lig. 7c drawii the longitudinal section as if cnmposed of regular tabulse, but no 

 such are foimd in his original specimen. 



