KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 32. N:0 I. 107 



Coccoseris Ungerni. Eichwald. 



Pl. XII, figs. 3—7. 



1855. Lophoseris Ungerni ElCHWALD. Bull. Soo. Nat. Moscou, p. 466. 



1860. Coccoseris Ungerni ID. Lethsea rossica, vol. I, I, p. 442, pl. XXV, fig. 4a — c. 



1883. » •) Ferd. Roemer. Leth. Geogn., 1' Tb., p. 456. 



It has growii in disciforin polyparies of exceeding thiimess, coramonly one or two 

 millimeters and in tiers of lamelLf above each other. It has not been attached as seen 

 by the free and finely striated epitheca. Tiie calicles attain 1,5 or nearly 2 millim. in 

 diameter. They are not separated from the coenenchyma by any distinct theca. There 

 are twelve triangulär, broad and somewhat sinuous septa, attaining a length of '"/s of the 

 distance from the margin of the calicle to its centra. Their surface is coarsely decorated 

 with blunt tubercles and the dividing grooves between them are sinuous. The central 

 area of the calicle is covered by several irregular papilla? soine of them in continuation 

 with the septa. There are no tabulaj in the interiör and the wliole calicular tube is 

 filled with the septa and in the middle with long prismatic baculi of the comraon fibrous 

 structure, as seen pl. xii, f. 6 — 7 in longitudinal and transverse sections and it is their 

 tops which project in the calicle as papilla^. In sections the septa are also seen to consist 

 of rods of the same pinnate structure, but they are oblique and directed upwards and 

 inwards, being a little curved, thus upon the whole reminding of the septal spines in the 

 true Heliolitidfe, but cohering and forming a lamella (pl. xii, f. 7). 



The coenenchyma, which upon the whole is scarce between the closely set calicles, 

 is tubercular with small papillte or pitted by irregular holes, not very deep and enclosed 

 within thick walls, depeiiding on the state of preservation, as the specimens with pits are 

 weathered. The mäss of the coenenchyma consists of baculi (figs. 6 — 7, pl. xii). 



I have examined specimens from Grossenhof, Kerkiill, Sutlep in Estland and from 

 Hohenholm in Dagö {F"") and Oddalera. A fine specimen has been found detached on the 

 shore near Wisby, provenience problematic. No specimens hitherto found in situ in Swedeii. 



Coccoseris microforus. Eichwald. 

 Pl. XII, figs. 12—15. 



1856. Heliolithes microporus ElCHW. Bull. de Moscou I, p. 89. 



1860. Id. Letlifea rossica, vol. I, I, p. 454, pl. XXV, fig. la, b, c. 



1883. » inicroporadj Ferd. Roem. Leth. Geogn., p. 509. 



It has grown in an exceedingly thin lamina of 1,5 millim. in tliickness, extending 

 its surface in a specimen över a length of more than 3 centim. Diameter of calicles 

 nearly one milliui., no theca. The seiota have a rather indistinct outline, being fringed by 

 large tubercles which without dividing lines are raixed with those of the area, in conse- 

 quence of what it is often ditlicult to see where the septum ends and the central area 



