OF WESTERN SIND. 123 



Test small, circular in marginal contour, moderately high and subconical above, 

 height nearly equal to two thirds of the diameter, gently rounded at the margin and 

 flat beneath. Peristome subcircular or decagonal, equal in diameter to one third of 

 the diameter of the test. Mouth-slits very faintly indented. Ambulacral areas nearly 

 equal in width to two thirds of the breadth of the interambulacral areas (4 mm. to 

 6-5 mm. accurately). Poriferous zones rather wide, pairs of pores arranged in oblique 

 lines of threes. There are three poriferous plates to each whole ambulacral plate, the 

 middle one being small and wedge-shaped, hardly more than half the breadth of the 

 other two, between which it has the appearance of being intercalated. The pair of 

 pores borne by this small median plate is the last and most outward pair of each of the 

 oblique lines of threes ; whilst the first pair of the oblique series, which is also the most 

 inward and aboral, is borne on the lowest or adoral poriferous plate of the next more 

 aboral ambulacral plate. The three pairs of pores which constitute the oblique lines 

 of threes consequently do not correspond with the three pairs of pores comprised in 

 each individual ambulacral plate. The tuberculation of the test is entirely destroyed 

 and the ambulacral plates are weathered down so as to become roof-shaped and bevelled 

 towards the aboral and adoral margins. There appear to be traces of two rows of 

 primary tubercles in the interporiferous area, placed marginally; and there are also 

 traces of vertical prolongations (1 costal ridges) uniting the primary tubercle with its 

 succeeding neighbour. 



The ornamentation of the interambulacral areas is similarly destroyed, and the 

 plates are roof-shaped and bevelled down to the adoral and aboral sutures, like the 

 plates of the ambulacral area. Traces exist of a central primary tubercle accompanied 

 at the ambitus by two smaller ones on either side, thus forming a horizontal row of five 

 upon the plate. The companion tubercles decrease in number upon the upper portion 

 of the abactinal surface and towards the peristome, the central primary alone being 

 present at the apex, whilst three are continued to this peristome. Vertical prolonga- 

 tions or ridges proceed from each of the tubercles and unite them with the correspond- 

 ing tubercles of the neighbouring plate in vertical succession, producing, along with the 

 effects of weathering^ the remarkable horizontal series of round, isolated, pit-like cavities 

 along the suture-lines of the interambulacral plates. If these were filled in with ink, 

 as in d'Archiac and Haime's type specimen, the similarity would be complete. 



Memarhs. We have little doubt that the fossil under consideration is the same 

 species as that described in the monograph of our French predecessors ; but the condi- 

 tion of the specimen is such as to render it perfectly useless for any critical purposes. 

 From the lithological appearance we have very grave doubts about this specimen really 

 belonging to the Khirthar series. It is possible that some mistake may have been made in 

 the locality assigned to the specimen, and we would urge caution in accepting this as a 

 Khirthar form until further verification is forthcoming. These doubts are strengthened 

 by the fact that T. Bousseaui (together with the other species of Temnechini described 

 by d'Archiac and Haime as Temnopleuri) are in reality Miocene species; and to this 

 we have referred at greater length in the 'Description of the Echinoidea of Kachh and 

 Kattywar.' 



