OF KACHH AND KATTYWAR. 17 



The interporiferous zones are narrow in the upper part of the test where the pori- 

 ferous zones are at their broadest. There the poriferous zone is only slightly narrower 

 than the interporiferous area. The breadth of the interporiferous zone increases 

 towards the margin. 



The ornamentation of the interporiferous zones is scanty, small, and distant down 

 to near the margin, where it becomes larger and closer ; on the edge of the actinal 

 surface it is still larger, and near the peristome larger still and not so close. It consists 

 of low tubercles, with small perforate mamelons and crenulate bosses (usually worn oiF) 

 standing in barely sunken or flat scrobicules, which are wide and are encircled by a 

 row of distinct granules sharp at the top, and resembling the largest of those seen on 

 the costae between the grooves of the poriferous zone. The circles of granules may or 

 may not interfere with each other. The ambulacra are wide apart, equidistant, and 

 the extreme breadth is from 14-15 millim. 



The interradia are wide, and the ornamentation, of the same kind as that of the 

 interporiferous zones, is scanty abactinally, closer at the margin, and largest and closest 

 near the peristome. Actinally there is more space in the interradia near the peristome 

 in the 1st and 3rd areas than in the others ; and consequently the 2nd and 3rd, and 4th 

 and 5th ambulacra are closer together at the peristome than the 1st and 2nd, and 3rd 

 and 4th (Loven's enumeration). 



The peristome is subcentral, sunken, very large, and its longest diameter, obliquely 

 placed, is between the right antero-lateral and left postero-lateral interradial spaces 

 (between areas 2 and 4). It is deep, widely open, and has a precipitous inner wall. 

 The shape is irregular, a lesser anterior curve being opposed to a larger and posterior 

 one ; where the extremities of the curves meet at the ends of the long diameter are 

 blunt angles. A close and larger than ordinary tuberculation covers the sides of the 

 peristome ; and the length of the long diameter is 18 millim. in large and 14 in 

 smaller specimens, and the length of the short diameter is 11 millim. and 6 millim. 

 respectively. 



The periproct is large, pear-shaped, situated longitudinally, bluntly angular in 

 front, broadest near its posterior end, which is close to the margin. The periproct is 

 slightly longer than the long diameter of the peristome. The distance of the anterior 

 angle of the periproct from the posterior edge of the peristome is rather more than one 

 half of the length of the periproct itself. 



In a perfectly uninjured specimen the test rests on the tumid actinal surface, not 

 very distant from the edge of the peristome, the whole of the tumid margins being 

 above the resting-plane. 



The plates of the ambulacra near the peristome are larger than further out, and 

 the pairs of pores perforate them ; every third pair perforate a small accessory plate 

 placed near the interradium. 



The arrangement of the interradial plates at the peristomial edge is as in Echinoneus. 

 There is a single broad plate in areas 1, 3, 5, and there are two plates in areas 2 and 4. 



Locality. Kachh. Nummulitic beds in white limestone. Survey-numbers 



