OF WESTERN SIND. 281 



the places where the horizontal sutures of plates meet the median suture, in other 

 words, at the corners of the plates. The miliary zone is occupied by a small, some- 

 what irregular, miliary granulation. The granules are irregular and generally diminish 

 in size as they recede from the scrobicular ring, but are often irregular both in size and 

 shape. Here and there some appear to have a tendency towards confluency, indicated 

 rather by shape than by actual contact, and in some places on a few plates irregular and 

 ill-defined channels may be traced from the scrobicular ring to the median suture ; but 

 no constancy can be noted in this character. Not more than three series of miliaries 

 can be counted between the scrobicular ring and the median suture. The most aboral 

 primary plate in each column of the interambulacral area has the primary tubercle 

 imperfectly developed, and the region surrounding- its scrobicule is well granulated. 



The peristome is small and pentagonal, 16 millim. in diameter in a specimen 40 

 millim. in diameter at the ambitus. There is a rather strongly developed notch (still 

 very minute) at the junction of the ambulacral and interambulacral areas (see Fig. 8, 

 where the artist has perhaps rendered it a trifle too deep). Unfortunately the apical 

 disk is wanting in all our specimens; but judging from the aperture presented by the 

 type specimen (shown in Fig. 1) its size was relatively small for the genus. 



MemarJcs. This species is distinguished from any other Indian form with M'hich we 

 are acquainted. It has some resemblances to the two Cidarids which we have described 

 from Kattywar*, viz. C. depressa and C. granulata ; but is distinguished from the 

 former by the narrowness and character of the ambulacra, and from the latter by the 

 same features, as well as the character of the ornamentation of the primary interradial 

 plates. In C. apipara the narrowness of the ambulacral areas and the breadth of the 

 interambulacral areas are remarkable, whilst the large size of the scrobicular areas, the 

 prominence and isolation of the miliary tubercles of the scrobicular ring, and the 

 diminutive size and paucity of the general miliary granulation of the interambulacral 

 plates furnish well-marked characters. 



Dimensions. The following are the measurements of four specimens : — ' 



a, I, e. d. 



mjllini. miUiin. millim. millim. 



Height . . . SOf 295 26-5 ISf 



Breadth . . . 53J 43 39-5 31-5$ 



Localities^. In the Gaj series of strata : — 



i. Four miles south-west of Beynir Hill. Survey-number G ^3-3-- 

 ii. Scarp at Kupo-jo-lak, or pass on the M61 range, west of Shah -beg (same 

 locality as G ^i^t)- Survey-number G \^. 



iii. Naig-Nai valley, twelve miles south of Shah Rhui. Survey-number G \^. 

 iv, A few miles south of Pir Mangal (Mugger Peer). Survey-number G ^5^. 

 V. Sita Nai, Khirthar range. Survey-number G -f^. 



* ' Tert. Echin. Kachh and Kattywar,' Pal. Ind. Ser. XIY, (1883). 

 f In these measurements the test is slightly crushed. 



J In the measurements thus marked, the test is slightly crushed out of shape, the measurement given 

 being the mean of the major and minor diameters. 



2q 



