Notices of Memoirs— Phyllopoda of Paiceozoic Rocks. 559 



Irish Sea was an area in whicli the salt-bearing Triassic marls were 

 deposited. It points towards the truth of Mr. Dickenson's sugges- 

 tion that the Cheshire salt-field was formerly continuous with that 

 of Ireland. These marls have since been broken up, faulted, and 

 denuded away in many places. It is an open question how far those 

 of the Isle of Man are now continuous under the sea eastwards to 

 Barrow and Fleetwood, and to the north-west in the direction of 



All these rocks are buried under a great thickness of boulder 

 sand, gravel, and clay, amounting at the Point of Ayre to 298 feet. 

 To this also must be added the height of the drift hills close by, 

 formed of the same materials, which would give the total thickness 

 as not less than 450 feet in the extreme north. The rocky floor on 

 which it rests dips rapidly to the north-east towards the deeper part 



of the Irish Sea. • j i. i. 



The discovery of this salt-field is likely to add a new industry to 

 the resources of the Isle of Man. 



n.— Fossil Phyllopoda of the Paleozoic Eocks. Eleventh 

 " Report of the Committee, consisting of Professor T. 

 Wiltshire (Chairman), Dr. H. Woodward, and Professor 

 T. Rupert Jones (Secretary). Drawn up by Professor T. 

 Rupert Jones, F.R.S., F.G.S. 

 1 A NEW species of Beecher's phyllocaridal genus Ehjmocaris, 

 *A from the collection of Dr. G. J. Hinde, F.G.S., has beea 

 figured and described in the Geological Magazine for July^ 1894, 

 pr292, PL IX. Fig. 7. It was found at Arkona, Ontario, Canada, 

 in the Hamilton group of the Middle Devonian series ^ ^. , , 



Its nearest known ally is Elymocaris capsella (Hall and Clarke), 

 from the Hamilton group of New York State, Paleeont. New York, 

 vol vii 1888, p. 181, pi. xxxi. fig. 4. It differs, however, m details 

 of outline, ornament, and ocular spot. The new species is named 

 E. Hindei, after its discoverer. _ 



2 Two imperfect sets of abdominal segments, impressed on a 

 piece of Moffat Shale (from Garpel Linn), have been noticed in 

 association with a carapace of Biscinocaris Broioniana, and therefore 

 probably belonging to individuals of either that genus and species, 

 or of Aptychopsis, or possibly Feltocaris, which also occur in the 

 Moffat Shales. The two above-mentioned specimens are figured 

 and described in the Geological Magazine for July, 1894, p. ^91, 

 PI. IX. Figs. 4rt, 4&. Pig 3 shows the associated carapace, ihey 

 belong to the Carlisle Museum. . 



We have noticed similar abdominal segments, but differing some- 

 what in size, associated with Hymenocaris in the Tremadoc slates, 

 and with Ceratiocaris in the Upper Silurian beds As such body- 

 rings belong to various groups of these low-class Crustacea, it is not 

 extraordinary that the above-mentioned genera should each possess 

 the same kind of structure in the abdominal region. . , „ 



3 A good-sized Biscinocaris Browmana and the moiety ot a 

 rather large Aptychopsis Wilsoni, preserved in the Carhsle Museum, 



