OF WESTERN SIND. 329 



Locality. Gaj series or Miocene of Sind : Hills E. of TMna Shah-beg. Survey 

 number G^^oT- 



Illustrations of the Species {variety) in, Plate LI. 

 Fig. 4, Actinal surface : natural size. 

 6. Abactinal view : natural size. 

 6. A lunule seen from the actinal side : magnified. 



8. A vievp of the crushed javi^s and supporting internal structures. 



9. Another view : slightly magnified. 



12. A view of a side of a broken piece of the test of a large form, showing 

 the sides of the supporting plate and a few pillars, 



2. ECHINODISCUS, sp. 



A much mutilated pair of specimens of considerable dimensions are to be seen in 

 the collection from the Gaj deposits. One of the specimens has a part of two small 

 oval lunules, each of which was, when perfect, about one half of the size of a petal. 



The test is broader than long, rounded and slightly notched in front, broadest 

 behind the antero-lateral petals, and with a very low and depressed test, there being 

 hardly any rise from the excessively thin edge to the apical system. The anterior 

 petal is the longest, and the apical system is large. The four generative pores are 

 beyond the basal plates. Actinally the test is nearly flat, but no details can be made 

 out. On the whole the resemblance is to Echinodiscus Desori, but the lunules differ 

 in shape. The breadth of the test was nearly 90 millim. and the length was less. 



Locality. Gaj series or Miocene of Sind : Four miles S.W. of Beynir Hill, and 

 three miles S.E. of Tong. Survey-number G -^ and G ^j^o"- 



3. Echinodiscus placenta, Duncan & Sladen. Plate LI. Fig. 7, Plate Lll, Figs. 1-8, 8. 



The test is broadly ovoid, broadest behind on a level with the end of the apical 

 one third of the posterior ambulacra, nearly semicircular behind, and narrowing 

 gradually in front so as to be bluntly pointed anteriorly where there is a shallow 

 incurvation. The length is 91 millim., and the breadth is 85 millim. The test has very 

 sharp margins, a flat actinal surface, and the height is exceedingly small for the size, 

 being at the most 8 millim. 



The apical system is large and slightly excentric in front ; the generative pores are 

 beyond the basal plates and the optic pores are indistinct. The madreporite is central. 

 The anterior petal is the longest and, like the others, is not quite closed. The rosette 

 is about the length of a petal from the side of the test, and the posterior petals are at 

 a greater distance, there being a lunule in a line with each towards the margin. There 

 is much surface between the petals and the margin of the test. The lunules are two 

 in number, one in each posterior ambulacral space. They are large and 11 millim. in 

 length and 7 miUim. in breadth. They are therefore broadly elliptical in shape and are 

 about half their length from the posterior margin. The amount of interradial space 

 is considerable, and there is only the slightest rise from the margin of a space to the 



2t 



