438 ON SOME NEW TRILOBITES FROM BOWNING, N.S.W., 



Cyphaspis Bowningensis, n. sp. 

 (Plate XVI. fig. 3.) 



The specimen here described is nearly complete, and was obtainetS 

 by me from the upper Trilobite Bed of the Bowning group. 



Head- shield apparently semicircular, though as the specimen 

 is slightly contorted, and one of the free cheeks is absent, that is not 

 certain. 



The glabella is pyriform, very convex, circumscribed lobe small,, 

 axial furrow distinct and deep in front; anterior portion of the 

 facial suture dii-ected outwards at an angle of about 30°, the 

 posterior portion cuts the side lobes in about the middle. The 

 eye is crescentic. The genal angles terminate in spines about 33 in. 

 long (1-6 mm. nearly) ; limb strongly curved downwards in front, 

 and the edge upwards. 



The thorax is about as wide as long, the axis very prominent, 

 with 11 or 12 segments ; its greatest width ^ in. (1-6 mm. nearly) 

 across the first three segments, from thence it gradually diminishes to 

 about one-half of that width at its articulation with the axis of the 

 tail. The side lobes as wide, or a little more, as the axis, strongly 

 curved at the sides. Medial suture of pleurjB visible, and not 

 extending exactly to the ends. Axis of tail very prominent, first 

 two segments well-defined ; first two pleural of side lobes similarly 

 well-defined, and the sulcus visible. Contour of tail semicircular or 

 triangular, and twice as wide as long. No granulation distinguish- 

 able, but this may ai'ise from imperfect preservation. 



Dimensions— Head H in. (4-233 mm.) long ; glabella long J^ in. 

 (2-91 mm.); thorax long '§ in. (6-6 mm.); tail long ^ in. 

 (1-83 mm.). Total length l in. (12-7 mm.). 



This species is found associated with two species of Acidaspis, one 

 of which bears a resemblance to A. Leonhardi ; two species of 

 Froetus ; two species of Phacops, like P.fecundus and P. caudatus ; 

 several species of Orthoceras ; and some lamellibranchs and gaster- 

 opods not yet made out. 



Locality. — Bowning. From a specimen in my collection. 



