Mr. H. J. Carter on the Fossil Foraminifera of Scinde. 453 



furcation and effetation of the rows^ and their consequent multi- 

 plication and disappearance, the incomplete and lateral growth 

 at first, their subsequent entire concentricity, and the plane 

 being only one chamber deep — as in Orbiioides dispansa. Eut 

 the chambers are quite different in shape from those of O. dis' 

 pansa, different in the direction of their increase in size and in 

 the arrangement of the canal-system or sarcodal bands which, 

 accompany them. They also frequently present an arrangement 

 like that of the interspaces and lines on an engine-turned watch- 

 case, at the commencement (772) ; and although I believe they 

 become as much concentric as the rov.s in Orbitoides dispanso, 

 still, out of many successful sections in other respects, I have 

 never been able to trace a row completely round, that is, forming 

 an entire circle ; it has always bifurcated or thrown off another 

 row, or become diminished to the annular canal, which could be 

 traced on for some distance and then disappeared, or began again 

 to bear chambers which could not well be identified with those 

 of the original row (n). 



The chambers in the normal foim, that is, where they com- 

 mence from a minute cell, are small and globular in the centre 

 (h), but become larger and elongated vej-ticaUy with their distance 

 from it (A'); so that they soon assume a cylindrical form, which 

 presents a curve towards the centre and a corresponding con- 

 vexity in the opposite direction : thus the plane becomes much 

 thicker towards the circumference, indeed is thickest there 

 {g 1), although, as in all other instances, the horizontal diameter 

 of the chambers is diminished {i). The chambers are also 

 arranged alternately in adjoining rows, and united together by 

 systems of oblique and annular canals, which were originally 

 filled with sarcode, and to which we will now particularly direct 

 our attention. 



The oblique system [l 4) consists of canals or bands which 

 pursue an oblique course from the centre to the circumference, 

 like the lines on an engine-turned watch-case, that is, making 

 each a semi-gyration from the centre to the circumference ; and 

 as there are two (?) sets of these canals at the commencement, 

 situated res])ectively in two distinct and separate planes, and the 

 canals of each plane gyrate in opposite directions respectively, so 

 their interstices are quadrangular, and have their angles circu- 

 larly and radiatingly opposite to each other, also like the inter- 

 stices of the figure on the watch-case ; while in the inner angle 

 of each of the spaces is placed the chamber, in contact with 

 the two canals, as they cross each other on different planes at 

 this point {k, I). At first there are only two planes of these 

 canals or bands, but as the chambers become elongated vertically 

 they may be increased to four and six (y 4). The largest iufil- 



