OF WESTERN SIND. 323 



The greatest width of the petals is about midway between the extremities, and is pro- 

 portional to the length as 1 : 1"85, the actual dimensions of the posterolateral petal in 

 the example described being 25 millim. long and 135 raillim. broad. The poriferous 

 zones are very wide outwardly, and their breadth increases step by step until within 

 eight to ten pairs of pores from the extremity ; it then very gradually diminishes until 

 the last one or two pairs of pores, which diminish rapidly and give a somewhat rounded 

 character to the termination of the poriferous zone. The inner pores are round and 

 the outer pores only very slightly oval or subpyriform near the outer extremity of the 

 petal ; they are united by an indistinct and shallow conjugating furrow, and the inter- 

 mediate costse are ornamented with five or six small scrobiculated tubercles, closely placed 

 and often with a little irregularity in their disposition. The broadest part of the 

 poriferous zone is 3-5 millim. and is equal to half the breadth of the interporiferous 

 area at that place. The widest part of the interporiferous area is nearer the apex than 

 midway between the extremities, and measures 9 millim. or a fraction less. The odd 

 anterior ambulacrum is similar in all respects to those above described, the length 

 being a little greater, and the poriferous zones perhaps not attaining quite so great a 

 breadth. The distance of the paired petals from the margin is greater than half their 

 length, but in the case of the odd anterior petal the distance is greater. 



The interradial areas are very narrow and insignificant on quite the inner half of 

 the abactinal area. On the outer portion their ornamentation consists of small scrobi- 

 culated tubercles, with the granular interspaces between the scrobicules on the average 

 not greater than the diameter of the scrobicules. At the margin and on the actinal 

 surface the scrobicules are closely placed and only separated by a narrow dissepiment. 

 On the interporiferous areas the scrobicules are usually separated by spaces less than 

 their own diameter in width. 



The actinal surface is concave, the depression commencing at a little distance from 

 the tumidity which is found surrounding the margin, and continues to the mouth 

 without curvature. The ambulacra on the actinal surface are in rather deep well- 

 defined grooves. 



The peristome is small and subcentral ; the periproct small, circular, and not more 

 than its own diameter distant from the margin. 



Eemarks. In general appearance this species looks like a gigantic C. scutiformis, 

 but is distinguished from that form by its more pentagonal marginal contour, by the 

 different form of the petals, as well as by its size. 



Dimensions, Length of the test 84 naiUim., breadth 65 miUim., height 18 millim. 



Locality. Tn the Gaj series of strata : Ravine on the south-east of B H, twelve 

 miles north of Shdh-beg (about 30 feet below the coral zone). Survey-number G^^l, 



Illustrations of the Species in Plate L. 

 Fig. 5. Abactinal view of the test : natural size. 



6, Longitudinal profile of the same ; natural size. 



2x2 



