OF WESTERN SIND. 267 



Illustrations of the Species in Plate XLIII. 



Fig. 1 . The test, side view : natural size. 



2. Actinal surface. 



3. Part of anterior ambulacrum, showing obliquity of plate : magnified. 



4. Ornamentation of ambulacrum : magnified. 



5. Ornamentation of under surface : magnified. 



10. EcHmoLAMPAS TUMiDA, Buncan & Sladen, Variety. 



The test is circular in marginal outline, nearly hemispherical, tumid at the margins 

 except in the posterior part of the test, and with a swollen actinal surface around a 

 slightly sunken central peristome. 



The highest point of the test is behind the apical system, which is rather excentric 

 in front; There is some flattening of the test on either side of the anterior ambulacrum. 



Apical system rather large. The ambulacra are long, slightly raised, widely open 

 at the end ; the poriferous zones of each ambulacrum are nearly equal, except in the 

 postero-lateral ; they become narrow gradually, and are less than one half of the breadth 

 of an interporiferous area. 



The pairs of pores are separated by well-developed costse, with a single row of 

 miliaries on them, and there is some obliquity of the poriferous part of the plate. The 

 inner pores are smaller and more circular than the others, which are long and comma- 

 shaped, where not much worn. 



The anterior ambulacrum is very long, comes close to the margin, and is widely 

 open. It is 49 millim. long and 1 centim. broad near its end. It is very slightly bent. 

 The antero-lateral ambulacra are of the same length and breadth as the odd one ; the 

 posterior poriferous zone is the most curved and the longer ; there is a slight tendency 

 to close. The postero-lateral ambulacra are the longest and broadest, and the posterior 

 zone is the longer. 



The peristome is broad, and the floscelle developed. The periproct is close to the 

 edge and inframarginal. The ornamentation of the ambulacra is rather small and of 

 the same size as that of the interradia ; the tubercles are separated by a miliary raised 

 tissue. Actinally the ornamentation is large, and especially near the peristome. 



Dimensions. Length 104 millim., breadth 101 millim., height 59 miUim. Eelative 

 length to breadth 1 : 0'97 ; relative length to height 1 : 0-56. 



Locality. Nari series (Oligocene). S.E. side of Trak Hill. Survey-number G 4^#. 



The circular marginal contour is very characteristic of this variety. 



Family SPATANGIB^. 

 Genus EUSPATANGUS, Agassiz, 1847. 



1. EusPATANGUS EOSTRATUS, d'ArcUac. Plate XLIII, Fig. 6. 



Some large forms of this Euspatangus are in the Nari series, and approach Euspa- 

 tangus affinis, nobis, which was described in the memoir on the Fossil Echinoidea 



