24 HINDE, ANNELID KEMAINS FROM SILURIAN OF GOTLAND. 



a sliglit curve botli in front and at tlic lower eud, it traver- 

 ses the flange in a diagonal direction. There are from 14 to 

 17 dcnticles, tlie three anterior are laro-er, more ronnded and 

 blunter than those succeeding, wliicli, in some speciraens, are 

 acutely pointed. The under surface exhibits a decp hollow, 

 except in front where it is arclied över. Both riglit and left 

 jaws are present and the two halves difFer very slightly from 

 each other. An average example is 1 mm. in length and 

 0,5 6 mm. in width. The specimens are numerous. 

 ♦^ Locality. Wisby. 



Lumbriconereites falciformis, n. Pl. 3, figs. 74 — 77. 



Under this term I include a small group of jaws which 

 agree in j^ossessing a curved or nearly straight toothcd ridge, 

 and a small straight or curved shank, Avhich is either at riglit 

 angles or oblique to the ridge. The under surface, except 

 the shank, is usually hollow. It is probable that thcy are 

 secondary dental plates (Säge-platten) of the jaw apparatus, 

 and belong to more than one species. 



Var. a, fig. 74. This form has a conical shank which 

 projects, nearly at right angles, from the anterior of the toothcd 

 ridge. The ridge is slightly cvirved, triangulär in section; 

 on its crest are 8 to 10 dcnticles; the anterior ones are 

 worn down and bluuted, the following are conical, acute, and 

 directed backwards. Length 0,8 5 mm.; breadth, to the end 

 of the shank, 0,6 7. Eare. 



Var. b, fig. 76. The shank is dimiuutive and curved, tlic 

 toothed ridge curves completely över, there are about 13 den- 

 ticlcs, those in front are minute and blunted, whilst those at the 

 extremity are conical and projecting. Length 0,5 4 ; widthO,.T mm. 



Var. c, fig. 77. The shank is elongated, rod-shaped, and 

 at right angles to the triangulär jaw plate; the toothed ridge 

 is depressed; there are 9 denticles, the first two larger and 

 more blunted than the following, which are conical and directed 

 backwards. Length 0,3 8; width 0,3 1 mm. 



Var. d, fig. 75. In this form the shank projects obli- 

 quely; the toothed ridge is gently curved and there is a se- 

 ries of rounded denticles on its crest, 10 to 14 in number. 

 Length 0,51; width 0,22 5 mm, 



Locality. vVll these varicties are from Wisl)y and they 

 are vory rare. 



