BY R. ETHERIDGE^ JUNR.^ AND JOHN MITCHELL. 671 



large lateral (axial) tubercles visible and separated by wide, deep 

 furrow-like spaces, anterior or fifth apparently covered by the 

 embracing and inner lobe of the free cheek; neck-furrow absent, 

 but its lateral extension over the fixed cheek very deep; neck- 

 ring also absent, and its lateral extension narrow and strongly 

 geniculate; axial grooves very deep; fixed cheeks very tumid, 

 ridge-like, decidedly geniculate, rising very abruptly both from 

 axial and posterior furrows, tuberculate, tubercles small, uneven 

 in size and sparse, hence the eye-lobes are also close to these 

 furrows; genal lobe very small, narrow, bearing one row of small 

 tubercles and overhanging the posterior transverse furrows; 

 gcnal angles rounded and only slightly thickened, granulate; 

 free cheeks relatively large, placed anteriorly, tuberculation in- 

 conspicuous and tubercles of variable size, borders moderately 

 thickened, furrows shallow, joining inwardly with the axial 

 furrows and outward with the posterior furrows of the fixed 

 cheeks, inwardly they pass about half-way across the inner lobe; 

 that is, the axial grooves, instead of distinctly crossing the front 

 border of the cephalon, bifurcate, and one branch proceeds out- 

 ward and the other inward along the free cheek furrows. Facial 

 sntures anteriorly pass out in the manner usual in the Encrinuri; 

 the posterior portion passes straightly outward from about the 

 middle of the lateral side of the eye, cutting the border well in 

 front of the genal angles; this portion is practically at right 

 angles with the axial grooves. Eyes conical, faceted, prominent, 

 pedunculate, and surrounded by distinct sulci. 



Obs. — The fragmentary cephalon and detached free cheeks 

 described above are so strikingly different from all other Aus- 

 tralian, as well as from foreign species of Eiicrhiurus known to 

 us, that we have no hesitation in giving it specific rank. 



The features which separate it from other species are— (l)the 

 transversely elongate elliptical form of the cephalon, with its 

 nearly straight anterior border; (2) the closeness of the anterior 

 branches of the facial sutures and the perpendicularity of the 

 posterior branches of these, with the axial furrows, or central 

 axial line; (3) the long, narrow and straight-sided glabella; (4) 

 the anteriorly situated free cheeks; (5) the sparse tuberculation; 



