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



11 



Eunicites contractus, n. Pl. 1. fig. 10. 



Jaw plate somewhat crescentiform, with a slightly concave 

 ixpper surface, the anterior margin slightly rounded and exten- 

 ded to a small pointed shank; the oviter lateral margin curved 

 in front, and then nearly straight to the bkmted posterior 

 extremity; the free margin is curved and is furnished with a 

 series of 8 to 10 triangulär blunted denticles, very irregular 

 in size, the fourth in the series being the largest. Length 

 1,23, width 0,8 1 mm. This jaw is distinctly characterized from 

 the preceding large dental plates by its relative shortness and 

 more prominent denticles. Rare. 



Locality. Fröjel. 



Eunicites serrula, Hinde. Pl. 1, figs. 11, 12. 



1880. -StaurocephaUtes serrula, Hinde. Quart. Jour. Geol. Soc. Vol. 

 36 p. 37G. Pl. 14, figs. 18—20. 



Jaw plates oblong, flat or having the oblique anterior 

 margin slightly incurved, widest in front and graduallv di- 

 minishing towards the posterior end which is blunted or slightly 

 truncate. The lateral margins usually straight; the free margin 

 carries a regular series of triangulär pointed denticles, 11 to 

 17 in number. A fairly large example is 1 mm., in length, 

 and 0,3.') mm. in width. Though generally smaller in size, the 

 specimens correspond closely in form with the examples from 

 the English Wenlock, which, in my former paper, I erroneously 

 included in the genus StaurocephaUtes ; I now regard them as 

 more probably unpaired dental plates of Eunicites. They are 

 fairly abundant. 



Locality. AVisby and Fröjel. 



Eunicites coronatus, Hinde. Plate 1, fig. 13. 



1679. Eunicites coronatus, Hinde. Quart. J. G. Soc. Vol. 35 p. 381. 

 Pl. 20, fig. 9. 



Jaw semilunar in outline, consisting of a hoUow arched 

 plate, with a wide, open base next the jaw-sac, on the summit 

 of the plate is a strong curved ridge, carrying a series of 

 about 11 rounded blunted denticles. Length of fairly large 

 example 1,36 mm., breadth 0,58 mm. The resemblance of 

 these jaw plates to the paragnaths of the existing genus 

 Eunicea is so close, that there is every probability they occupied 

 a similar position in the jaw armature of the palseozoic forms. 



