10 
specimens, are covered at high tide, and had altogether escaped the notice of the 
Geological Surveyors, until I pointed them out to Sir Henry James, then em- 
ployed as an officer of Engineers on the Survey. The measured section of Little 
Newtown Head shows the limited area occupied by the fossiliferous portion of 
rocks. The more extensive beds of stratified deposits appear to have been acted 
on by the adjacent trap dyke when in a state of fusion, until the more siliceous 
portions became converted into a quartzite, and all traces of organic forms were 
obliterated. 
It may here be observed that I lent my specimens to General Portlock, who 
figured several of them in his Geological Report of Londonderry and Tyrone, one 
of which specimens he named Asaphus dilatatus, pi. 24, fig. 2 ; he also alludes to 
my discoveries, at page 293, in the following words — " communicated by Major 
Austin," yet notwithstanding this clear acknowledgement of the source from which 
the specimens were derived, Mr. Salter has renamed the A. dilatatus, calling it 
Ogygia Portlockii, dedicating it to the General as its discoverer ! Decade 2, t. 7." 
The paper concluded with some remarks upon Trilobites generally, their 
habits, probable position in the animal kingdom, &c. 
