216 THE FOSSIL ECHINOIDEA 



which disappears, however, at the apex. The petaloid ambulacra are in moderately 

 deep grooves, those of the posterior pair having a scooped-out appearance in conse- 

 quence of the greater depression midway between the extremities. The anterior pair 

 of petals are longer than the posterior pair; they proceed straight from the apex 

 towards the margin, and are very nearly horizontal, the angle subtended being about 

 155°. The poriferous zones are broad; the pores large, equal, oval, united by a conju- 

 gating groove, and the pairs separated by ridge-like costse. There is a very sudden and 

 great abortion of the seven or eight terminal pairs of the anterior zone at the apex of 

 the anterior petals, and two or three pairs are aborted in the companion zone. In the 

 posterior pair of petals about two pairs of pores are aborted in the anterior zone and 

 three pairs in the posterior zone. The interporiferous areas are narrow, their width 

 being not greater than the distance of the pores apart in the poriferous zones, and the 

 areas in the posterior petals are perhaps a shade narrower than in the anterior petals. 



A great portion of the actinal surface is obscured by matrix ; such portions, how- 

 ever, as are exposed lead to the supposition that the ambulacral areas on the actinal 

 surface were in slight depressions, whilst the intervening interradial areas were 

 slightly tumid. 



Traces are discernible of the peripetalous and of the subanal fascioles ; the latter 

 was of wide extension, ^,nd included four or five pairs of ambulacral pores on either 

 side. 



Traces of the ornamentation may be seen on the abactinal surface near the margin, 

 where the miliary tubercles appear moderately large and distinct ; and along the flanks 

 of the groove of the odd anterior ambulacrum the tuberculation is larger than the 

 general miliary tuberculation. As usual, the tubercles are much larger on the actinal 

 surface ; and there was probably in this species some rather coarse granulation in the 

 ambulacral areas on either side of the actinal plastron. 



Dimensions. Length of the test 40 millim., breadth 38"5 millim., height 16 millim. 



Locality. In the Khirthar series of strata : Near Meting Eailway-station. Survey- 

 number ^. 



Illustrations of the Specimen in Plate XXXVI. 



Fig. 15. Abactinal view of the test: natural size. 



16. Longitudinal profile of the test : natural size. 



7, Metaha, sp. Plate XXXVI, Fig. 17. 



There is a single and much weathered fragment of a test which we consider to 

 belong to a species of Metalia distinct from any of the foregoing. The fragmentary 

 and badly preserved state of the fossil render the specimen insufficient for specific 

 diagnosis ; hence, until better examples are forthcoming, we limit our reference to this 

 species to the following brief remarks. 



The most striking feature of the fragment consists in the long straight postero- 

 lateral ambulacral petals, which are placed in well-defined but not very deep depressions, 

 and are equal to or even slightly longer than the anterior pair. The poriferous zones 



