Note on Trtlobites, dc. 
253 
two Truncatulinas, when examined by aid of the microscope, 
was found to consist entirely of homogeneous matter ; but 
the other presented a far different appearance. Its segments 
or zooids, and their connecting bands, all appeared to be 
enclosed in a well-defined membrane. Each segment was 
nearly destitute of sarcode, and contained a highly refrac- 
tive body, in which appeared, with the utmost distinctness, 
a germinal vesicle or spot. I can regard this body only as a 
true egg, which has been developed at the expense of the 
sarcodal element of the segments, in many of which the repro- 
ductive process is occurring simultaneously. Yet it may be 
objected that the ova in the larger segments are greatly 
larger than the young or original animals of Truncatulina. 
In some animals, however, as in Spongilla, Gregorina, &c., 
many individuals are produced from a single egg ; and it is 
not improbable that a process of great division of the egg or 
swarming may take place in Truncatulina, by which a great 
number of animals may be produced from each segment. 
II. Note on the Occurrence of Trilobites in the Carhoniferoiis Limestones 
of FifesMre. Bj R, H. Traquair, Esq. (Speciinens exhibited.) 
In the neighbourhood of St Andrews, Fifeshire, remains 
of a trilobite {GriffitJiides mucronatus — M'Coy) are pretty 
common in the shale overlying the thick bed of limestone 
worked at Ladeddie, Wilkieston, and Newbigging, and be- 
longing to the Carboniferous Limestone series. 
At each of these quarries the limestone itself is hard, blue, 
and crystalline, and contains but few fossils ; but these, 
consisting of corals, polyzoa, shells, and trilobites, are 
abundant in the overlying shale, though generally in a very 
fragmentary condition. This is especially the case at Lad- 
eddie, and, com^bined with the soft and friable consistency 
of the shale, renders it difficult to obtain good specimens 
from that locality. At Wilkieston, however, the shale has 
assumed a more firm and slaty aspect, and the contained 
fossils are in a much better state of preservation. 
The trilobites occur for the most part in a very disjointed 
and fragmentary condition, entire specimens with head, 
thoracic segments, and caudal shield in apposition, beini: 
