86 THE FOSSIL CORALS AND 



and in many places are spined ; they are distant, projecting, and subequal. There is 

 no epitheca, but some exotheca exists between the costae. The septa are unequal, 

 numerous, and crowded ; the primaries are large, and the higher orders are long, slender, 

 and wavy, and relate to the larger costae. 



The genus has its type, Leptomussa variabilis, D'Achiardi, in the Nummulitic of 

 Italy. The form from Sind approaches a true Mussa which has not yet undergone 

 fissiparity ; but it is an old individual and fully developed. 



Height of coral-lum 2-^ inches. 



Length of calice If inch. 



302 

 61 • 



Locality. South of Magar Pir, near Karachi, Gaj series. Survey-number G 



Illustration of the Species in Plate XXII. 

 Fig. 8. The corallum : natural size. 



Genus CALAMOPHYLLIA, M. Ed. & J. H., amended 1831. 



1. Calamophyllia elongata, Duncan. Plate XVIII, Figs. 17-20. 



The corallum is in long, more or less cylindrical pieces which seldom branch, and 

 then from one side. The corallites are of the same slender character for considerable 

 spaces; they are smallest at the base or point of origin from others, and frequently the 

 calice is contracted ; they are nearly straight, cylindrical or angular here and there, 

 and are marked with very distinct rather distant costse, some of which are much 

 larger than others. From 24 to 36 costse exist in large specimens, and are wavy, sharp, 

 narrow, and much smaller than the intercostal space, in which there is often a low 

 rounded ill-developed costa. As a rule, the costae correspond to large septa only. 



The septa, few in number, are wide apart, and are alternately large and small ; 

 they are tapering, and do not quite reach the axial space. Some are rudimentary and 

 curve close to the wall. There are 36 to 40 septa of all sizes in a well-developed 

 specimen. 



There is no columella, and the axial space is vacant. A few endo thecal dissepi- 

 ments exist. There is no epitheca, and there are traces of a few exothecal dissepiments. 

 A few irregular swellings of the thin wall occur as collarettes. 



Height of longest corallite 4 inches. Breadth of widest corallite ^ inch. 



Locality. Nari Nai, Khirthar range, Gaj series. Survey-number G ^^. 



Illustrations of the Species in Plate XVIII. 



Fig. 17. Corallite : natural size. a. A long corallite, 



18. Outlines of calices : natural size. 



19. A section of a corallite : magnified. 



20. Costge: magnified. 



