OF WESTERN SIND. 17 



Fig. 6. Apical system from another example, considerably weathered : magnified. 



7. Peristome and floscelle of the same specimen as Figs. 1-5 : magnified. 



8. Tuberculation of the abactinal surface : magnified. 



9. Tuberculation of the actinal surface, just below the ambitus : magnified. 



Plate III. 



1. Abactinal aspect of the test of another specimen : natural size. 



2. Longitudinal profile of the same : natural size. 



3. Transverse profile of the same, showing the posterior extremity : natural 



size. 



4. One of the ambulacral petals : magnified. 



5. The two posterior phyllodes of the floscelle : magnified. 



6. Longitudinal profile of another specimen : natural size. 



7. Transverse profile of the same, showing the posterior extremity: natural 



size. 



8. Actinal aspect of another specimen : natural size. 



9. Portion of the margin of the peristome of the same, showing the oral 



termination of the ambulacra and the formation of the phyllode, 

 denuded of ornament : magnified. 



10. Actinal aspect of another specimen : natural size. 



11. Portion of the margin of the peristome of the same, seen obliquely, 



denuded of ornament : magnified. 



12. Abactinal aspect of the test of a small specimen, with well-developed 



keel : natural size. 



13. Longitudinal profile of the same : natural size. 



14. Transverse profile of the same, showing the posterior extremity : natural 



size. 



15. Abactinal aspect of the test of a small specimen : natural size. 



16. Abactinal aspect of the test of a still smaller specimen : natural size. 



17. Three odd anterior ambulacra : magnified. 



Family SPATANGIBJE. 

 Genus LINTHIA, Merian, 1858. 



Test oval, subcordiform, convex above, flat beneath. 



Ambulacra petaloid, sunken, unequal, the posterior pair shorter and less divergent 

 than the anterior pair. Poriferous zones equal ; pores subequal. Anterior odd ambu- 

 lacra different from the others, placed in a deep anterior groove, which may or may not 

 indent the margin. Poriferous zones composed of small pores, in simple pairs, more 

 or less widely spaced. 



Apical system compact, excentric in front. 



Peristome bilabiate, excentric in front. 



Periproct oval, situate at the summit of the posterior extremity. 



D 



