126 THE FOSSIL ECHINOIDEA 



Dimensions. 



millim. 



Length of the test 92 



Breadth of the test 81 



Height of the test 57 



Breadth of the petal at its widest part 13'5 



„ „ „ outer extremity ... 9 '5 



Breadth of the poriferous zone at its widest part . 3'75 to 4 



Locality . In the Khirthar series. Surban range, south of Eri, north-east of Bula 

 Khan's Thana. Survey-number — ^q-. 



niustrations of the Species in Plate XXIII. 



Fig. 1. Abactinal view of the test : natural size. 



2. Actinal view of the test: natural size. 



3. Longitudinal profile of the test : natural size. 



4. A bourrelet and rudimentary phyllode : magnified. 



5. Terminal extremity of an ambulacral petal : magnified. 



6. Apical disk: magnified. 



2. CoNOCLTPEUS PiNGUis, Duncan & Sladen. Plate XXIII, Figs. 7-11. 



The test is large, subovoid in. marginal outline, the greatest breadth being opposite 

 the extremities of the antero-lateral petals. The breadth is rather more than nine 

 tenths of the length, and the height is rather more than three fifths of the length. 

 The apical centre is slightly excentric in front, and the longitudinal profile, which is 

 subconoid in outline, shows the anterior to be more arched and tumid than the 

 posterior curve, the. odd posterior interradium being on a gentler slope and faintly 

 subcarinate. The actinal surface, though fiat generally, is slightly impressed around 

 the peristome, and the margins of the test are well rounded, so that the intervening 

 portion of the actinal surface becomes rather tumid in character. 



The apical disk is of moderate size. The four genital pores are oval and very 

 large, with the intermediate space occupied entirely by the madreporiform body, the 

 surface of which is also subtubercular. The ocular plates slightly encroach on this 

 body, and the optic pores are large and subtriangular or semicircular in shape. 



The ambulacral petals are wide, flush with the test, and somewhat flexuous in 

 their course ; they are widely open at their outer extremity, which terminates some- 

 what abruptly at a little distance from the margin, and there is a faint tendency 

 towards convergence. The poriferous zones are very wide, attaining their greatest 

 breadth at about the middle of the petal ; and the diminution of the breadth is neither 

 great nor rapid towards the extremity, where they are comparatively broad. The 

 interporiferous area is nearly twice as broad as the poriferous zone at its widest part. 

 The pores of a pair are very wide apart and united by a deep furrow ; the outer pore 

 is elongate and slit-like, and the inner pore round or elongately oval. The divisional 



