OF WESTERN SIND. 211 



Fig. 4. The apical disk : magnified. 



5. A portion of the abactinal surface, to show the antero-lateral petal and 

 the fasciole : magnified. 



3. Metalia scutipoemis (■?) var. eotunda, Duncan & 8laden. Plate XXXVI, Figs. 6 & 7. 



There is in the collection a single large specimen of a much-weathered test, the 

 outline and general facies of which are alone observable, all detail being either obscured 

 or destroyed. This form we place provisionally as a variety of M. scutiformis, though 

 it is quite possible that better material might warrant its recognition as a distinct 

 species. 



The marginal contour of the test is more rotund and more prominently expanded 

 laterally than in the normal form of the type species. The length of the test was 

 probably very little greater than the breadth, but the exact proportions are obliterated 

 in consequence of some crushing at the posterior extremity having produced a distor- 

 tion, which extends also on the actinal surface. Seen in longitudinal profile the 

 characteristic prominence of the odd posterior interradium is conspicuous, and the 

 general outline of the abactinal surface conforms closely with that of M. scutiformis. 

 The anterorlateral petals are equal to or slightly longer than the posterior pair, and 

 the furrow of the odd anterior ambulacrum is very shallow. 



Dimensions. The length of the test (crushed) is 50-5 millim., the breadth 

 49"5 millim., and the height 23 millim. 



Locality. In the Khirthar series. Sumbak Hill, south-west of the Vero plain. 

 Survey-number ^^. 



Illustrations of the Specimen in Plate XXXVI. 



Fig. 6. Abactinal view of the test : natural size. 



7. Outline of the longitudinal profile of the test : natural size. 



4. Metalia depkessa, Duncan & Sladen, Plate XXXVI, Figs. 8-10. 



Test of medium size. Marginal contour ovally subhexagonal, prominently ex- 

 panded laterally, slightly indented anteriorly by the anteal sulcus, broadly truncate 

 posteriorly. The greatest breadth is slightly anterior to the centre, and is about nine 

 tenths of the length, or in the proportion of 0'91 : 1. The dorsal surface is depressed, 

 its convexity being of slight elevation ; the apical summit of the test is excentric in 

 front, and corresponds with the apical disk, the height being rather more than two 

 fifths of the length. When seen in longitudinal , profile the slope on either side in the 

 neighbourhood of the apex is very slight ; a distance away anteriorly, however, a well- 

 developed curve passes rapidly to the margin and forms a full and well-rounded anterior 

 extremity. The posterior slope is very slight until close to the margin, where it is 

 abruptly rounded at the truncate posterior extremity. The transverse profile shows a 

 uniform convex curve, slightly flattened laterally. The actinal surface appears to have 

 been almost flat, and is well rounded at the margins. 



