Page:Report of the Second Norwegian Arctic Expedition in the "Fram," 1898-1902 (volume 4).djvu/160

 1898—4902, No.31] FOSSIL t-‘.\L'.\'.\s rnmt St-ZtitEs B 11

Tabulzzta. Fm'ositidae. Favositcs LAM.

Favosiles cf. helderbcrgiuc Il.u.i..

Pt. \‘1, ﬁg. 3.

Amongst the specimens of corals is a ﬂat fragment of n Fucositcs. which in all visible characters seems to agree closely with Fucosiles helderbcrgiae HALL, hut as the outer form amt the size are not exactly known it cannot with certainty he given any specific name. The piece which has a longest diameter of 576 cm. and an average thickness ofS—tl mm. is built tip by a number of parallel or only very slightly radiating coralt- ites, arranged vertically to the upper

irloce of the piece. which may represent the original one. The tuhes show on the whole a very uniform size, the diameter being about 1,5 mm. The tnhulao are throughout extremely closely arranged, 3—4 in one mm. that is, still more closely than is usually found in Favositns lleldcl'bergiae. “"hether this character is a constant one or not in the lorm in question. can of course not be decided helore more material is nvailahle Go on I'I‘en ce: B, lower part, Reindeer Valley

Furosiles forbusi E. and It, var. eifeleusis Nicu. Pl. IV, fig. 576. 1879. Favusiles forbesi E. and It. var. eifelmsis Nicuorsox, 0n the Structure and Afliuities oi the Tahulate C’M'ﬂls of the Palzoozic Period. p. 61, pl. II, fig. 3, pl. Ill, ligt 1—1 I).

Several specimen of it Favosites which must he referred to this form are found. The outer form varies from pyriform to more flat sull- hemispherical. Greatest diameter measured 7 amt The tuhes are of Very unequal size, the greatest almut 2 mm. in width. Between the larger hexagonal or pentagonal cells. there commonly occur very small, tri- angular or quadrilateral ones. Tahutae close, on an average 2 per mm, On the inner walls of the tubes are developed numerous rows of qlnlv

prominent spines. The pore seem to he :l"a|lgcd in two or three l'ﬂ\\'>.

With the unequal size of its tubes and also relatively small dimensions oi the colonies, this form without doubt is cluser related to Favosiles forbesi E. and H. With its weltdereloped seplat spines it seems further- more to agree with the type. which NICHOLSON (from Devonian specimens -. by pro-

fI'om Gerotstein) has named var. eifetensis l have hower paring microscopic sections of a Fat. forbesi from tho Silurian of (nob