REPORT ON THE DEEP-SEA DEPOSITS. 
849 
size of a hen’s egg to that of a marble, was in the trawl. The surfaces of most of these 
were coated with peroxide of manganese, and to the upper portions there were attached 
Brachiopods, Hydroids, and Foraminifera. 
Station 225, 4475 fathoms. — The sounding at this station indicated a considerable 
quantity of manganese, the sample of the deposit containing a very large number of 
grains of the black oxide of manganese, many of them of considerable size. 
Station 226, 2300 fathoms. — There was over a litre of pumice stones in the trawl, all 
coated by layers of manganese. 
Station 227, 2475 fathoms. — The sounding at this station indicated a large quantity of 
manganese. 
Station 230, 2425 fathoms. — More than a dozen rolled pumice fragments, about the 
size of a hen’s egg, covered with deposits of manganese, to one of which was attached a 
small Brachiopod, were collected. 
Station 236a, 420 fathoms. — Several very large hardened pieces of the bottom, per- 
forated by worms, whose tracks were frequently coated with manganese, were in the 
dredge. 
Station 237, 1875 fathoms. — There were several large, very hard and compact, blocks 
of the deposit. Black coatings of manganese lined the surfaces of the worm-tubes which 
perforated the blocks. Several pieces of pumice had likewise on some portions of their 
surfaces deposits of manganese. 
Station 241, 2300 fathoms. — Large numbers of pumice stones of all sizes, the 
majority covered with deposits of peroxide of manganese, were obtained. Two of 
these are represented in PL I. figs 7 and 8. Fig. 7 shows an irregular, white coloured 
fragment of liparitic pumice, the outer parts of which have been transformed into earthy 
matter, while in many of the fissures there are considerable deposits of peroxide of 
manganese, and in some parts concentric zones of manganese may be observed. Fig. 8 
shows a black-brown scoriaceous fragment of basaltic pumice, which has an areolar rather 
than a fibrous structure, and the rounded vesicles are frequently filled with infiltrated 
clay, giving the fragment an oolitic appearance ; crystals of plagioclase, 4 to 6 mm. in 
diameter, can be observed at the surface by the naked eye. 
Station 242, 2575 fathoms. — There were several manganese nodules, the largest a 
little over 1 cm. in diameter, with nuclei of pumice. 
Station 244, 2900 fathoms. — The bag of the trawl contained much clay and many 
pumice stones or manganese nodules, together with two sharks’ teeth. The nodules in 
this instance all consisted of pumice stones, with deposits of manganese on the outside. 
Station 246, 2050 fathoms. — In the trawl were procured several hundred rounded 
fragments of pumice. About forty of the largest had a diameter of about 30 cm., 
a large number about 2 cm., while in the washings of the ooze there were numerous 
fragments down to the minutest dimensions. Most of them were covered with deposits 
