OF WESTERN SIND. 31 



Illustrations of the Species in Plate VI. 



Fig. 1. Salenia Blanfordi, Duncan & Sladen. The test: natural size. 



2. The apical system and upper surface : magnified. 



3. A larger specimen, showing the actinal surface : slightly magnified. 



4. The abactinal surface ; magnified. 



5. A specimen: natural size. 



6. A portion of an ambulacrum : magnified. 



7. Three plates of the interradium : magnified. 



8. A young specimen : magnified. 



This species of Salenia was especially noticed by Mr. W. T, Blanford, F.E.S., 

 during the Survey of Sind, and he was good enough to examine it and to send a 

 description of it to us. He noticed the remarkable smallness of the apical disk, 

 and that one of the ocular plates enters the anal ring. These are the two distinctive 

 characters of the form, which distinguish it from the European Nummulitic Salenia 

 Pellati, Cotteau, and Salenia tertiaria, Tate, of the Miocene of Australia. 



Family QLYPEOSTOMATA. 



Subfamily DIADEMATID^. 



Genus CYPHOSOMA, Agassiz, 1840. 



Test moderate in size, circular or subpentagonal, slightly inflated at the sides. 

 General facies of test shows a regular and uniform development of its parts. 



Poriferous zones well developed and undulated. 



Pores simple, usually unigeminal throughout, sometimes bigeminal on the upper 

 surface, and slightly crowded together around the peristome. The poriferous plates are' 

 unequal and irregularly arranged. 



Primary tubercles nearly equal in both areas. Areolae well developed and some- 

 times marked with radiated striations. Bosses prominent, summits sharply crenulated. 

 Mamelon large, prominent, and imperforate. 



Peristome moderate in size and with small cuts. 



There are five specimens of a regular Echinid which come from the Eanikot series 

 of Sind, and they are in a good condition. Four of the specimens belong to one species ; 

 but there is some doubt about the similarity of the fifth to them, notwithstanding the 

 allowances that may be made for its being the youngest and smallest of the forms. 



The species belong to the genus Cyphosoma, Agass. ; but they are somewhat 

 abnormal, on account of the want of correspondence in size between the ambulacral 

 and interradial primary tubercles, the last-mentioned being decidedly the larger. The 

 other structural characters clearly bring the forms within the generic idea ; and there- 

 fore they are placed in it, especially as some variation between the dimensions of the 

 tubercles of both areas has been noticed in some species in Europe. 



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