9 
from the external character of the specimen, it appears evident to me that the 
so-called Camorocystitis is nothing more than an extraneous envelope which 
covers something that we do not see, and which therefore can only form a subject 
for conjecture. In conclusion, I must remark that not having seen the original 
specimen, the foregoing observations are alone founded on the cast of this 
supposed Crinoid." 
After examination and comparison of the specimens by the members, 
Major Austin read some observations on some species of Caradoc and 
Carboniferous Trilobites, specimens of which were exhibited, in illustration 
of his remarks. 
" The brief observations I am about to make, relate more particularly to some 
specimens of Trilobites which are not generally known, and which appear to me 
to possess more than ordinary interest. The specimen of Phillipsia ornata, which 
I obtained from the carboniferous limestone, Hook Point, county of Wexford, is, 
T believe, the most perfect specimen that has yet been obtained of this species, 
having the head or cephalic shield, (the component parts of which were so well 
described by Mr. Stoddart on a former occasion,) the thoracic portion, and pygi- 
dium attached, and though the specimen is somewhat distorted, it has the dorsal 
parts complete. All the other specimens of this carboniferous Crustacean 
hitherto obtained consist of the pygidium only. The three other specimens on 
the table from the same locality show the interior of the crustaceous covering of 
the pygidium, but present nothing very remarkable. 
The next specimen, which is from the Derbyshire carboniferous limestone, has 
a wide tuberculated marginal border around the pygidium. This border appears 
much more expanded when compared with the generality of specimens, and I 
cannot avoid thinking that some little confusion prevails in identifying and re- 
ferring species to the genus Phillipsia, as specimens differ so much in respect to 
this marginal border, some having a plain wide margin, others a wide tuberculated 
one, while in others it appears as only a narrow contracted edge, as may be seen 
in the various specimens on the table' 
The Silurian specimen of Salteria involuta, from the Caradoc beds at Little 
Newtown Head, near Woodstown, County of Waterford, has only recently been 
named, although it was first discovered by me in the year 1839, as was also the 
Acidaspis Jamesii, which latter fossil is peculiar to this particular locality. 
Ampyx Austinii, (Portlock's Geol. Rep.) I likewise discovered at the same time 
and in the same rocks. 
Prof. E. Forbes considered A. Austinii as identical with A. mammillatus of 
Sars, but it is not so, the latter species having long lateral appendages, which are 
wanting in A. Austinii. Up to the period named, the genus Ampyx had not been 
known as occurring in the United Kingdom. Several species of Trinucleus and 
other forms occur in the same locality, T. seticornis being abundant. Calymene 
Blumenbachii, variety brevicapitata, is not scarce in the same strata, and although 
the patch of rocks which have been denuded to a level with the sandy shore is not 
much more extensive than the area of our museum, yet thousands of fossils 
pervade the very limited mass. In the same beds I found several specimens of 
Bellerophon perturbatus, with hundreds of the small Orthis striatula, which are 
most beautifully preserved. These rocks, which have yielded so many interesting 
