COEAl/S PROM FUNAFUTI. 35 



The second specimen measures rather less than 3* 75 mm. in 

 diameter, and is evidently somewhat older than the first. The 

 costae corresponding to the six primary septa are produced into 

 as many stout conical spines (PI. 6. figs. 9 & 10), but the 

 remaining costae are not so prominent as in the first specimen, 

 as the theca has been, thickened by a secondary deposit, probably 

 of an epithecal character. The lower surface of the disc is 

 perfectly flat and presents a large scar, in which the septa and 

 columella are distinguishable, though the spaces between them 

 are filled up with secondary calcareous deposit. 



On the upper surface the calycle is somewhat deeper than in 

 the first specimen, and the septa are slightly more exsert. The 

 columella also is more abundant, but there are no distinct pali. 

 As in the first specimen there are six systems, and three 

 complete orders and a fourth incomplete order of septa. In 

 this specimen the septa do not reach so far towards the centre 

 of the calycle as in the first, but the primaries are distinctly 

 the longest. Although the septa project but very little above 

 the level of the disc, their upper edges have evidently advanced 

 further in regrowth than was the case in the first specimen : 

 they are no longer horizontally truncated, but are rounded and 

 produced into tiny projecting spinose granules. The process 

 of regrowth has been most rapid in the tertiary, least rapid 

 in the secondary septa;, so that the last named are now the 

 smallest of all the cycles. Further, it may be observed that 

 while the costse of the secondary and quaternary septa are very 

 inconspicuous, those of the tertiary septa have increased in size, 

 and form two prominent swellings or ridges between every two 

 adjacent spines. In other words, the tertiary septa have grown 

 faster than the others, and it should be borne in mind that it is 

 in connection with the tertiary septa that the conspicuous crown 

 of pali, characteristic of the adult specimens of T. hastatus^ 

 is developed. 



The third specimen measures 4 mm. in diameter, and is 

 considerably further advanced in growth than the other two. 

 The six spines, corresponding to the primary septa, are not 

 much larger than in the second specimen, but the disc is thicker 

 and the scar on the lower surface is so completely filled up with 

 the secondary deposit that only a circular depression is left, 

 corresponding very nearly in size and appearance with the scars 



3* 



