ALCYONAEIA OF SIND. 109 



302 

 40 • 



Length of the joint l-^^ inch ; breadth -^ inch. 



Locality. Naigh-Nai valley, south-west of Manchhar Lake. Survey-number G 



Illustrations of the Species in Plate XXVIII. 



Fig. 6. The joints : natural size. 



7. A transverse section : magnified. 



3. Isis coMPEESSA, Buncan. Plate XXVIII, Figs. 4, 5. 



The joints coalesce laterally, and form a large irregular stem, which is compressed, 

 the interjoints being frequent. The ridges and furrows are very irregular and almost 

 reticulate in places, and the radial lamellae are not numerous. The joining surfaces 

 of the joints are elliptical in outline and nearly flat. 



Height of stem 2^% inches ; thickness ^q and ^ inch. 



Locality. Tandra Eahim Khan, in the Gaj series. Survey-number G -f-. 



Illustrations of the Species in Plate XXVIII. 



Fig. 4. The mass : natural size. 



5. The top of a joint : magnified. 



Isis, sp. 1. 



This is a species resembling somewhat Isis corallina, Morren, and some Isidince 

 from the Coralline zone of Cape Otway, Australia, described by myself. It is impossible 

 to give a specific name to the variable hard parts of every Isis. 



The specimen under consideration is short, about as tall as broad, slightly com- 

 pressed, very slightly constricted, and faintly projecting above and below. The ridges 

 and furrows are very visible above and below and on the flanks. On the last-named 

 part the flutings are broad and straight, and the ridges are well developed and straight. 

 It separates into two above and below, and has the appearance of being notched at 

 the edge of the upper and lower articulating surfaces. It is figured in Plate XXVIII. 

 Figure 8 gives a side view, and Figure 9 a magnified view of the upper surface. The 

 length is nearly -^ inch. 



An Isis, in part remarkably preserved, was found in the same stratum as that 

 just noticed, and is closely allied, the only distinction being that the strise are less 

 marked and less numerous. The joints are broader than high, and the interjoint 

 substance has partly been fossilized and partly not; but the position of the joints, 

 one of which has a branch, is retained. This form is very like Isis hippuris of the 

 Eastern seas. 



Locality. Naigh-Nai valley, south-west of Sehwan, in the Gaj series. Survey, 

 number G -^^. 



Plate XXVIII. Fig. 10. The joints : natural size. 



