62 



E. ELEQANTULUS, n. sp. — Glabella clavate, uniformlv and moderately 

 convex ; front broadly rounded ; sides nearly straight or gently concave, 

 separated from the cheeks by a deep but narrow groove ; three very short 

 but deep glabellar furrows on each side ; neck furrow all across ; surface 

 covered with small rounded tubercles about one-sixth of a line in diameter 

 and a little less than their width distant from each other. All other parts 

 of the head unknown. The glabellar lobes have the appearance of three 

 round tubercles on each side. The first pair of furrows are situated on a 

 line drawn across the glabella at one-third the length from the front mar- 

 gin, and are rather obscure. The two others are about equidistant from 

 each other. The last pair of lobes have their posterior edges nearly in 

 contact with the neck furrow. Pygidium triangular, strongly convex in 

 front ; axis elongate acutely conical, depressed convex ; twenty four seg- 

 ments, of which the first eight or nine extend all across the others," represen- 

 ted by elongated pits on each side. In the sides there are five pairs of 

 pleurse. The first pair take their origin at the first segment of the axis, 

 and extending outwards at right angles, nearly, for a distance equal to 

 half the width of the axis curve downwards and backwards until their ex- 

 tremities are about opposite the mid-length of the pygidium. The second 

 pair seem to spring from the second segment of the axis and curve 

 backwards from the side of the axis itself. The third pair originate 

 from the fourth segment of the axis ; the fourth pair from the sixth, 

 and the fifth pair from the eight or ninth. The latter are nearly 

 parallel with the sides of the axis, being only slightly curved outwards ; 

 towards the apex of the axis they converge and nearly unite behind it, and 

 are continued as two short sharp spines giving the aspect of a double 

 caudal mucro. The fourth pair terminate about opposite the end of the 

 axis, but are not spinose at their extremities. The others almost their own 

 width in advance of each other. There are no tubercles on either the 

 axis or side lobes. Between the fifth rib and the side of the axis there is 

 a narrow smooth space with a faint groove on the inside ; it extends round 

 the apex of the axis and seems to be the rudiment of a sixth pair of ribs. 

 Close to the very point of the axis there is a small pit in the smooth 

 border. 



Length of glabella, excluding the neck furrow and segment, 3 lines ; 

 width at the anterior corners 3J ; width at the neck furrow 2 lines. 

 Length of pygidium, measured along the median line of the axis, but exclu- 

 ding the spines, 5 lines ; width measured across at the termination of the 

 first pair of ribs 4 lines ; height at the first segment of the axis 2 lines. 



Only two specimens, one of the pygidium and the other a glabella, both 

 on the same piece of stone within an inch of each other and almost certainly 

 belonging to the same undividual, were collected. The species is evidently 

 allied to those figured by McCoy under the names of Zethus atractopyge 



