BY J. MITCHELL. 855 



Family PROETIDAE. 



Genus Cyphaspis. 



Cyphaspis filmeri, n.sp. 



(Plate xlvii., figs. 9-11.) 



Only the medial portion of a head shield of this trilobite is at 

 present known, and, although its singular features led me many 

 years since to conclude that it represented a new species for 

 Australia, in the expectation of acquiring additional and better 

 specimens, the description of it was deferred till now. 



Sp. Chars. — Cephalic shield probably subsemicircular and de- 

 pressed. Glabella subquadrate or suboval, moderately elevated 

 and dorsally depressed, sides steep, as are also both front and 

 back, granulated with six to seven longitudinal rows of even- 

 sized granules. Glabellar basal lobes not sufficiently well pre- 

 served to determine their characters. Neck furrow relatively 

 wide and deep. Neck ring narrow, strap-like, surmounted by 

 one very distinct medial tubercle and a less distinct one on each 

 side of it near the axial grooves. Limb relatively wide, finely 

 granulated, strongly upturned, deeply furrowed or convex in 

 front. Axial furrows defined. Fixed cheeks small, wings 

 short. Free cheeks and eyes unknown. Facial sutures an- 

 teriorly between eyes and inner boundary of limbs straight, 

 thence diverge at an angle of about 30° . Margin not thickened. 

 Length of head, 4.7 mm. 



Obs.— The only Australian Cyphaspis that has come under 

 notice that bears any resemblance to the present type is C. 

 horani, and to that species the resemblance is confined to the 

 character of the granulation on the glabellae. To no head shield 

 of any foreign Cyphaspis which has come under my notice does 

 the present species bear close resemblance or at least to the 

 portion of it available for the above description. 



Dedicated to Mr. W. D. Filmer, of Toronto, N.S.W., an 

 enthusiastic collector of natural history specimens. 



hoc. and horizon. — Great Southern Road, Belle Vale estate, 

 Parish of Yass, County King. Lower Trilobite Beds of Bown- 

 ing and Yass series; associated with Cyphaspis yassensis and 

 Calymene australis, Upper Silurian. — etage E. of Bohemia. 



