Vol. 52.] FROM THE CARBONIFEROUS LIMESTONE. 440 



base. The pincers b (figs. 2 & 2 a) are robust, with straight bases 

 where resting on the supports; above the base there is a well- 

 marked curve, terminating in an angle where the pincer is widest \ 

 from this the plate gradually curves upwards and ends in a stout 

 hook. There is a rounded ridge along the outer margin of the 

 pincer, and a distinct nodular elevation at the narrow basal end. 

 The pincers are 3*8 mm. in length and 1*5 mm. at their greatest 

 width. The dental plates d (figs. 2 & 2 a) are elongate, with a 

 nearly straight base ; at the anterior end is a stout curved denticle, 

 followed by a much smaller one, and then by a series of stout 

 conical denticles, of which there are nine in the left plate, but only 

 five are shown in the cast of the right plate. The denticles in the 

 right plate d (figs. 2 & 2 a) as shown in the cast are stronger than 

 those of the left (c), and though one or two may be concealed I do 

 not think there were as many as in the left. The position of these 

 dental plates in regard to the pincers is remarkable. They now 

 rest with the curved anterior tooth and the succeeding series of 

 denticles turned towards the exterior side of the jaw and having 

 their straight bases facing each other as shown in fig. 2, whereas 

 in recent allied forms these plates have their dentated margins 

 facing each other, and their straight or curved bases are within or 

 beneath the curved hollows of the pincers. It is difficult to see : 

 how in the fossil the dental plates could act conjointly with the 

 pincers in their present position, and I can only suppose that they 

 have been turned outward by subsequent pressure. In the 

 specimen, as shown in fig. 2, the greater portion of the right 

 dental plate (d) has broken away, but the cast of it is preserved in 

 the counterpart, as seen in fig. 2 a, while the left plate (c) is complete, 

 with the exception of the anterior hook which is shown in the cast. 

 The length of this plate is 3*3 mm., and its width at the anterior end 

 is 1*1 mm. A cast of a nearly similar but somewhat smaller dental 

 plate occurs in a detached condition on another slab of shale (fig. 3). 

 I cannot find positively that any unpaired dental plate was present 

 in the specimen, though it is possible that it might be hidden 

 beneath the upper plate (c). Attached near the side of one of the 

 pincers was a small plate, roughly triangular in outline, with four 

 blunt denticles on one margin and a small projection from the 

 opposite angle, which may possibly have been a paragnath of the 

 same specimen, though it is relatively small in comparison with 

 similar plates in recent forms (PI. XXII. fig. 2 e). Another minute 

 detached plate, which may have been a paragnath, is shown (fig. 4),. 

 but there are no grounds for connecting it with the larger specimen. 

 No traces of any structure resembling the lower jaws of an annelid 

 corresponding to this upper jaw-apparatus have been discovered. 



Notwithstanding the peculiar position of the dental plates in 

 this jaw, the individual pieces correspond with sufficient closeness- 

 to those of the recent Eunicea family for this to be included in the- 

 genus Eunicites, Ehlers, as a new species, Eunicites Iieidice y in? 

 honour of its discoverer. The only annelid-remains known hitherto* 

 from the Lower Carboniferous are some detached plates from the 

 shaly limestone of Cults, Fifeshire, and among these is a pincer 



