308 THE FOSSIL ECHINOIDEA 



the adoral edge. Nearer the peristome, and where the plates are lower but broader, 

 the tubercle is at about the centre of the plate. 



The edges of each plate are ornamented by a few small secondaries with boss and 

 mamelon, and there are usually at least three of these near the poriferous zone, and 

 they are connected with the costulation of the poriferous plates as already noticed; 

 Other small tubercles are near the median suture, and they are not connected by 

 ridges with the corresponding parts of the opposite coronal plates; but the small 

 tubercles which are placed near the adoral and the aboral edges are connected with 

 the large primary by means of narrow convex ridges separated by still narrower deep 

 and linear grooves or spaces, and this, more or less, vertical series of ridges may even 

 extend from the tubercle of one plate to that of the plate above or below. As a rule, 

 the ridges stop at the transverse sutures. Above the equator there is a triplet of 

 ambulacral plates in contact with each interradial plate. 



The peristome is small, nearly circular, and there are no cuts. 



Dimensions. Height 8 millim., breadth 11 millim. 



Locality. The Gaj or Miocene series of Sind : Naig Nai valley, 12 miles south of 

 Shah Ehui. Survey-number G ^q-- 



Illustrations of the Species in Plate XL VII. 



Fig. 5. The test. 



6. Part of the abactinal surface : magnified. 



7. Part of the ambitus : magnified. 



2. Lepidopleueus granulatus, Duncan & Sladen. 



The test is turban-shaped, broader than high, tumid close above the ambitus, 

 sloping without a bold curve to the apical system, and swollen actinally, but concave 

 at the small, nearly circular, and very minutely incised peristome. 



The apical system is slightly projecting above the ordinary curve of the test; it is 

 solid and rather large, the height of the basals from their adoral angle to the periproct 

 being well developed. The periproct is surrounded by a decided ridge, and is not 

 large. The basals have the pore large and near their adoral angle, and the madrepprite 

 has its surface swollen and raised above the level of that of the other basals. It has a 

 pore beyond the spongy part and close to the angle. The radials are broader than 

 high, are tumid adorally, and there are the relics of a minute granulation upon them. 

 The optic pore is close to the adoral margin. 



The ambulacra are narrow, flush with the rest of the test ; but the poriferous zones 

 are sunken slightly and narrow. The pairs of pores are nearly in straight series, and 

 are only slightly in simple ill-defined arcs. Or in successive series of oblique triplets. 

 There is no doubling of pairs ; and near the peristome the breadth of the ambulacra 

 is small, and a little less than that of the interradia. The breadth of the ambulacra, a 

 little above the ambitus, is considerably less than the interradia there. There is a 

 vertical row of small primary tubercles on each side of the interporiferous area, close 

 to the pores, and the tubercles are with a broad base which slopes up gradually to 



