356 Proceedings. 



to the genus Ortona^ which was originally proposed for 

 the Silurians. There is, however, Ortona Carbonaria, a 

 tubicular annelid with small tube, slightly conical, straight, 

 or slightly curved, with circular sections ornamented by 

 sharp continuous undulations or rings, which agrees nearly 

 with our objects. L astly, we find in our sections tiny curved 

 spine-like objects, which may be taken to belong to the 

 sixth class of the annelids, viz., Ditrupa, Tubes, small, 

 elongate, curved, plain, smooth, hollow, tapering gradually. 

 This is the tiniest annelid of all, and it is now living on the 

 coast of Madeira. It is found in the Scotch Coal Measures. 

 It will be seen, therefore, that all these forms of annelids 

 are characteristic of the Carboniferous Epoch. A correct 

 knowledge of these tiny objects is of value, as it enables us 

 to recognise an Upper Coal Measure limestone by a very 

 simple microscopic test." 



Mr. J. Cosmo Melvill, M.A., F.L.S., read a paper 

 entitled " An Historical Account of the genus Latirits and 

 its dependencies, with descriptions of eleven new species," 

 and presented a catalogue of Latirus and Peristernia^ 

 embodying the results of his re-classification. A collection 

 of the shells was exhibited. 



A paper by Mr. W. W. H. Gee, B.Sc, F.C.S., and 

 Thomas Ewan, Ph.D., B.Sc, on "The Comparison of 

 Thermometers," was read by the last-named gentleman, 

 who was introduced by Mr. Gee. 



