126 



Contributions to Palaeontology. 



DIKELOCEPHALUS MISA(d.s.). 

 PLATE III, FIG. 15; AND PLATE V, FIGS. 4, 5, and ? 6, 7 & 8. 



Glabella prominent, somewhat conical, truncate at the 

 apex, the length about equal to its width at base, which 

 is more than one-third greater than the width in front. 

 Three pairs of furrows are visible ; the posterior ones 

 oblique and sometimes slightly marked across the mid- 

 dle, leaving the posterior lobes deeply separated and 

 directed forward at the extremities. Median lobes and 

 furrows directed a little forward ; anterior furrows faintly 

 impressed, leaving a very narrow anterior lobe ; occipi- 

 tal furrow well defined, straight in the middle, and 

 curving a little upwards at the sides : occipital ring 

 wider in the middle, curving forward towards the 

 extremities. 



Facial suture directed slightly inwards from the anterior 

 margin, and thence curving gently outwards, it follows 

 the line of the palpebral lobe nearly to the occipital 

 furrow, when it turns abruptly outwards. Dorsal furrow 

 rather wide and deep, continuing a little less distinctly 

 around the front. 



Fixed cheeks narrow, expanding in the direction of the 

 eye, and separated from the palpebral lobe by a long 

 distinct sigmoid groove : posterior limb narrow, its extent 

 unknown. Frontal limb of moderate width separated 

 from the glabella by a narrow groove, marked along the 

 middle by a shallow transverse furrow, which is stronger 

 at the sides and sometimes nearly obsolete in the middle ; 

 anterior margin flattened, and a little produced in the 

 middle. 



The characters here given are pretty constant in several 

 specimens : the prominent lobed glabella, broad dorsal 

 furrow, and narrow fixed cheeks, are distinguishing fea- 



