BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 7. N:0 5. 23 



under Eunicites. The resemblance of the figures given by 

 Pan])ER of the Sphagodus ohliquus of Eichwald to the Got- 

 land forms, when viewed in a certain position, leaves no doubt 

 in my mind that the Gotland specimens are similar to this 

 species, which was obtained from the Silurian strata of the 

 Isle of Oesel, and referred somewhat doubtfiilly by Pander 

 to fish teeth. Some examples also from the English Wenlock 

 which I placed under Lumhriconereites basalis, I now find pro- 

 perly to belong to this species, but the original type of L. 

 basalis from the Clinton series of Canada is a much larger 

 form and the size and position of its anterior tooth lead me 

 to regard it as belonging to a difierent species. 



Locality. Wisby and Fröjel. 



Lumbriconereites perdentatus, Hinde. Pl. o, figs. 68 — 71. 



1879. Eunicites perdentatus, Hinde. Quart. Jour. Geol. Soc. Vol. 

 35 p. 375. Pl. 18. fig. 6. 



Jaws minute clongate, in general form resembling the 

 precediug species, but with a less development of the basal 

 flange, which, in the right jaAv plates, is limited to the lower 

 half of the jaw. The dental ridge is slightly curved and has 

 from 14 to 17 denticles, the anterior are larger, and, in some 

 examples, acutely pointed; the following ones are conical and 

 directed backwards. As a rule the jaws belonging to the 

 right half are larger than those of the left half of the jaw 

 apparatus. An average example is 0,6 5 mm. length by 0,2.5 

 mm. in width. The Gotland specimens are smaller than the 

 type from the Cincinnati series of Toronto, but so far as I 

 can determine from the Canadian forms, which are only par- 

 tially exposed, they otherwise correspond. From the prece- 

 diug species they diifer in the character of the basal flange 

 and in their much smaller dimensions. 



Locality. Wisby. 



Lumbriconereites spatiosus, n. Plate 3, figs. 72, 73, 73a. 



Jaw subrhomboidal in outline, with a wide subquadrate, 

 convex basal flange, which is exposed on both sides of the 

 dental ridge. On the outer margin the flange projects upwards 

 as a short spine, below this it runs nearly straight to the ex- 

 treme posterior end of the jaw. The inner margin of the 

 flange only extends for about two thirds of the length of the 

 jaw, and is then obliquely truncate. The toothcd ridge has 



