OF WESTERN SIND. 331 



5. EcHmoDiscus elongatus, Duncan & Sladen. Plate LI, Fig. 10. 



The test is very low, thin, longer than broad, more sharply rounded at the anterior 

 margin than at the posterior, where it is nearly straight and broadest in front of the 

 antero-lateral petals. 



Apical system slightly excentric in front, system large, hexagonal, and the generative 

 pores at the angles and beyond them. The ambulacra are subequal, broad, and the 

 posterior pair are close together at the apex. Poriferous zones nearly closed, and the 

 interporiferous areas are well developed. The ends of the lateral ambulacra are not 

 quite their own length from the margin of the test, and the rosette is small. There is 

 a long narrow lunule in each posterior ambulacral tract, and the length is nearly that 

 of the petal, from which it is only separated by a very short distance. 



The interradia are large and their plates have the same adoral curving and median 

 curving also which have been noticed in the instance of Echinodiscus placenta, nobis, 

 and figured on Plate LI, Fig. 7. The length of the specimen is 47 millim., and the 

 breadth 40 millim. 



Locality. The Gaj series or Miocene of Sind: Naig-Nai valley, twelve miles S. 

 of Shah Rhui. Survey-number G -^q-. 



Illustrations of the Species in Plate LI. 

 Fig. 10. The test in outline : natural size. 



6. Echinodiscus, sp. Plate LII, Figs. 4-7. 



A large form, the details of which are not suflBciently preserved to enable a 

 specific diagnosis to be made, is in the collection from four miles S.W. of Beyuir Hill. 

 Survey-number G -3-3-. 



The distinctive character is the slight dome shape and the evident slight hollowing 

 out of the well-marked actinal surface. The edge, however, is thin. The apical disk 

 is large, and one of the subequal petals is 27 millim. long. The lunules are not 

 preserved. 



Illustrations of the form in Plate LII. 



Fig. 4. The abactinal view : natural size. 



5. Actinal view. 



6. A part of the abactinal surface : magnified. 



7. Surface of a test, showing the tops of the supporting structures. 



A fragment in the collection leads to the inference that there are some very large 

 forms oi Echinodiscus va. the Miocene of Sind, for the petal of one is 35 millim. in length 

 and 14 millim. in breadth. 



2y2 



