444 Miscellaneous. 



with minerals of a darker hue. Under the microscope the rock 

 presents the character of a fine siliceous mud with crystals of augite 

 &c., tcgether with the sparsely scattered tests of Foraminifera. The 

 approximate chemical composition of typical specimens is : — Silica, 

 50 per cent. ; alumina, 18 per cent. ; lime and magnesia, from 5 to 6 

 per cent. ; ferric oxide, from 3 to 8 per cent. ; water, 16 per cent., 

 Avith a small proportion of alkalies, chiefly potash, and but small trace 

 of carbonates. 



The Author's attention was chiefly directed to the common grey 

 friable rock, which may be softened in water and washed on a 

 sieve, the residue consisting mainly of Foraminifera with a few 

 Ostracoda. Of three specimens examined, 1 is a light-grey rock from 

 close to the sea-level ; 2, of a lighter colour, from about 100 feet 

 elevation ; 3 is nearly white and somewhat harder, and was derived 

 from an intermediate point. So far as the Microzoa are concerned, 

 the first two present no differences which might not be observed in 

 dredgiugs from the recent sea-bottom, taken at similar depths a little 

 distance apart. The third appears to have been deposited in some- 

 what deeper water. There is a marked scarcity of arenaceous 

 Foraminifera. 



Then followed notes on the rarer and more interesting species, 

 together with a list of the 92 species of Foraminifera found. Of 

 these, 87 are forms still living in the neighbourhood of the Pacific 

 islands. Two of the remaining 5 are new to science, and the rest 

 extremely rare. The Author concluded that these deposits are of 

 Post-Tertiary age, formed at depths of from 150 to 200 fathoms in the 

 neighbourhood of a volcanic region. The following new or little- 

 known species were selected for illustration : — Elli^soidina eUip- 

 soides, var. ohlonga, Seguenza ;- Haplophragminm rugosum, D'Orb. ; 

 Ehrenhergina hicornis, sp. nov. ; Sphceroidina ornata, sp. nov. 



MISCELLANEOUS. 



^ga crenulata, Liitken. By J. Duncan Matthews, F.E.S.E. 



The captiire off the Scottish coast of a Crustacean hitherto unre- 

 corded from British waters seems of sufficient interest for publi- 

 cation. 



The specimen was a parasitic Isopod, and was procured by Mr. 

 Murray, Fishery Officer, Stonehaven, and by him forwarded to the 

 scientific department of the Fishery Board for Scotland. Sent to 

 the Kev. Dr. Norman for identification, it was described by him as 

 a specimen of ^ga crenulata, Liitken, " a Greenland form not 

 previously found in our seas." 



This ^ga was taken in October 1886 from a large shark caught 

 entangled on lines about 8 miles off Stonehaven. Unfortunately 



