OF WESTERN SIND. 235 



the same species; the best-preserved example has been drawn to facilitate future 

 identification. 



Dimensions. Length of the test about 58 millim., breath about 50 millim., height 

 about 30 millim. 



Localities. In the Khirthar series of strata : — i. Dharan pass (east side), near Laki. 

 Survey-number ™. 



ii. Picked up on the east side of the Shiim valley, east of Damaj. Survey-number 



G226 

 86 • 



Illustrations of the Species in Plate XXXVI. 



Fig. 18. Abactinal view of the test : natural size. 



19. Longitudinal profile of the test: natural size. 



Genus EUSPATANGUS, Agassiz, 1847. 



Test of medium size, elongate, heart-shaped, generally depressed. Anteal sulcus 

 feebly developed. 



Ambulacral summit usually more or less excentric. Apical disk compact ; four 

 generative plates, with the central madreporiform body produced posteriorly. Odd 

 anterior ambulacrum different from the others, very insignificant, with small widely 

 spaced pairs of pores. Paired ambulacra petaloid, usually more or less wide, closed at 

 the extremity, not excavated. Poriferous zones broad, equal, less than the width of 

 the interporiferous area, the external series of pores pyriform, the internal round. 



Peristome bilabiate, excentric in front. 



Periproct at the summit of the posterior extremity. 



Tubercles of two kinds — one large, mammillated, perforate, crenulate, in scrobicules, 

 standing isolate and more or less widely spaced on the anterior and lateral interradia, 

 within the boundary of the peripetalous fasciole ; the general tuberculation of the test 

 being small and accompanied by numerous very small miliary granules. 



Two fascioles — peripetalous and subanal ; the peripetalous fasciole circumscribing 

 the ambulacral petals, the subanal more or less cordiform or reniform. 



1. EusPATANGUS AVELLANA, d'AvcMac & Haime. Plate XXXVIII, Figs. 8-13. 



Brissus? avellana, d'ArcJiiac (1850), Hist, des progres de la Geol. t. iii. p. 251. 



Eupatagus? avellana, d'Ardhiac Sf Haime (1853), Besorijp. An.foss. de I'Inde, p. 218, pi. xv, fig. 8 a, b. 



The following is the diagnosis of this species given by MM. dArchiac and 

 Haime: — ' 



Body oval, elongate, thick ; the four genital pores large and closely placed. Ambu- 

 lacral plates rather narrow, tolerably well closed, the posterior longest and straight, 

 the lateral feebly arched in front ; poriferous zones moderately broad, costulate, with 

 very large pores ; odd ambulacrum very indistinct, and simply indicated in front by a 

 very slight concavity. Anterior interambulacral areas a little broader than the lateral, 

 which are themselves a little more than the odd posterior ; all exhibiting large tubercles 



