636 T. ROBERTS ON A CONOCERAS FROM THE 
43. On a New Specres of Conoceras from the Luanviry Bens, 
ABEREIDDY, PEMBROKESHIRE. By Tuomas Roserts, Esq., B.A., 
F.G.S8., Woodwardian Museum, Cambridge. (Read June 25, 
1884.) 
[Puate XXVIIT.| 
Wuitst working in the Llanyirn series, near Abereiddy Bay, in 
Pembrokeshire, in June and again in September last, 1 found some 
fossils in a quarry which had apparently been but recently opened. 
This quarry is about half a mile N. of W. from the Llanvirn quarry, 
which has yielded such an interesting fauna to the researches of 
Dr. Hicks and others during the last few years, and from which 
too Prof. Hughes and his students, myself amongst them, obtaimed 
a good collection during the last Easter vacation. 
The rocks exposed in this new quarry are less fossiliferous than 
those at Llanvirn, and during both of my visits I succeeded in 
getting only eleven specimens, consisting of the following species, 
which Mr. Marr has identified for me :— 
Phacops llanvirnensis (?), Hicks. Didymograptus indentus, Hall. 
Trinucleus, sp.? Diplograptus, sp. ? 
Glossograptus ciliatus, Him. Conoceras, nov. sp. 
Only one specimen of Glossograptus eiliatus* has been as yet re- 
corded from St. Davids, while Conoceras is new to the district. 
This Conoceras I obtained trom one of the workmen in the new 
quarry, and the character of the matrix in which the fossil is im- 
bedded completely confirms the statement of the quarryman that 
he had found it there. 
The cleavage does not quite coincide with the bedding, and, as 
a result of this, the plane along which the Conoceras is exposed, 
cuts through the dorsal portion of the shell anteriorly, then, passing 
backwards, reaches its ventral border posteriorly. Hence the parts 
preserved consist, anteriorly, of a longitudinal section of the shell cut 
somewhat obliquely, while further back there is only a mould of 
the internal cast of the shell. The portion of the shell which is 
preserved is much compressed, and can be removed from its mould. 
The specimen is about 7 inches in length, and its greatest width 
is 2+ inches ; there seems to be but little augmentation in its width 
in passing forward from its hinder extremity; the lateral portions 
of the shell, however, are not well preserved, so that its exact 
original width cannot now be ascertained. 
The portion consisting of the mould only forms about three 
fourths of the entire length of the specimen, and on a part of it the 
disposition of the sutures of the septa is fairly well seen, especially 
their bending forward and meeting in an angle forming a band of © 
* Quart. Journ. Geol, Soc. vol. xxxi. p. 659. 
