42 Revieivs — Australian Antarctic Expedition. 



older. There are some raised beaches, and a cave has yielded 

 palaeoliths of Mousterian age, and nine human teeth of primitive 

 Neanderthal type. Alderney consists of diorite, varying from a very 

 basic form to a tonalite, with a grit {gres felspathique) of early 

 Arenig age. Diorite, tonalite, hornblende schist, and banded 

 granulites make up Sark. In Guernsey the southern and larger 

 portion is a somewhat variable gneiss, a pressure-modified more or 

 less porphyritic granite, the oldest rock in the islands, the northern 

 half being variations of diorite — basic, felspathic, and quartzose — 

 together with two small areas of granite. Mr. Parkinson retains 

 the name hornblende gabbro, which was employed by Messrs. Hill 

 and Bonney in their paper on Guernsey in 1884 (Quart. Journ., vol. xl, 

 pp. 410 and 425), but dropped after their work in 1910 (Quart. 

 Journ., vol. Ixviii, Tpp. 32-7) as they found it impossible to separate 

 precisely the varieties of diorite, though convinced that some of 

 them, at any rate, had once been augitic rocks. Dyke rocks occur 

 in all the islands, and in some mica-traps are rather abundant. 

 These are post-Arenig, and the greenstone, though rather older, 

 is probably the same. Microgranites are also found, some of which 

 seem to be post-Cambrian. The diorites, however, are probably 

 pre-Cambrian, and form a very interesting group of associated 

 rocks. As might be expected from their geographical position, 

 the sedimentary and some of the igneous rocks of these islands 

 are nearly related to those of the adjacent mainland of France, 

 but the hornblende schists and granulites of Sark are often indis- 

 tinguishable from corresponding rocks at the Lizard. 



Australian Antarctic Expedition, 1911-14 : Scientific 

 Eeports. Series C, Vol. IV, pt. iii : Brachiopoda. By 

 J. Allan Thomson. With 4 plates and 1 map. June, 1918. 

 T)x4.RT I of this memoir gives a systematic description of the 

 -^ Brachiopods obtained by the Australian Antarctic Expedition, 

 preceded by an account of what is known of the spicules of calcite 

 found in the body-wall and other parts, together with some remarks 

 on the punctation of the shell. Sixteen species are described, and are 

 referred to the genera Crania, Hemithyris, LiotJiyrella, Amphithyris 

 (gen. nov.), Stethothyris, GyrotJiyris, Magellania, Terehratella, and 

 Maca7iclrevia. 



Part II deals with the geographical distribution of the Brachiopods 

 of the Southern Seas. Twenty geographical districts are recognized 

 in the part of the sea-floor above the 1,000 fathom line, but in 

 half of these no Brachiopods have yet been found, so that future 

 discoveries may necessitate modifications in the conclusions drawn 

 from the distribution of the small number of species at present 

 known. Only one species is common to two of these geographical 

 districts ; all the other species are confined to single districts. 



The author points out the resemblance between the recent 



