F. E.ITTON ON DIATOMACEODS DEPOSITS FROM JUTLAND. 169 



This species has not, so far as I am aware, been found in any 

 other deposit than that from Fuur. I am indebted to G. M. 

 Browne, Esq., of Liverpool, for the loan of this species. 



3. Stephanogonia Danica (Grunow) — Valve in front view pro- 

 duced to a long blunt point ; side view discoid, with six or more 

 rays ; centre hyaline ; spaces between them marked by irregular, 

 anastomosing lines ; surface granulate, or rugose ; common in the 

 Mors, Fuur, and Nykjobing deposit (pi. 13, figs. 4-5). 



I have adopted Herr Grunow's generic and specific names on 

 the authority of the Typen Platte. Although common, I have not 

 been fortunate enough to detect a perfect frustule, and am unable 

 to tell whether the valves are similar. The probability is that they 

 are so, as no valve occurs in these deposits, differing from the one 

 now described, that can be referred to this species. The elegant 

 outline of front view of valve forcibly reminds of the tapering 

 dome of a Turkish minaret. 



4. Trinacria Heibergii (n. sp., F.K.) — Frustules in series ; pro- 

 cesses produced ; margin of valve convex, turgid, extending beyond 

 surface of valve ; central portion of valve umbonate; base of mar- 

 gin with conspicuous, moniliform granules, arranged in series, but 

 becoming scattered and distant as they approach the upper portion ; 

 surface of valves marked with small granules, arranged in radiant, 

 curved lines, indistinct or absent as they approach the centre (pi. 

 13, fig. 6). Mors deposit. 



Vai" margin as in preceding form; surface of valve hyaline, 

 smooth, or with few scattered granules (pi. 13, fig. 7). Mors 

 deposit. 



The very singular species I have above described is not uncom- 

 mon in this material, and I was long inclined to consider it a form 

 of T. regina, but the plumose arrangement of the granules, and their 

 small size, and the projecting margins, seem to warrant a separa- 

 tion from that species. The variety with upper surface smooth 

 might easily be mistaken for the marginal part only, but careful 

 focussing will detect the presence of a thin hyaline surface, some- 

 times marked with a few scattered granules. 



5. Triceratium maculatum (n. sp., F.K.) — Valve with slightly con- 

 cave margin ; granules small and close at the centre, larger and 

 scattered as they approach the sides ; margin with short, conspic- 

 uous costas ; centre of valve with three or more irregular, radiating 

 lines ; deposit Nvkjobing (pi. 14, fig. 14). 



