FROM THE EDDYSTONE GROUNDS TO START POINT. 419 



Ground XI. The North- West Eddystone Coarse Gravel. 



Hauls. 8 (Dr.), 9 (Dr.), 46 (Dr.), 47 (Dr.), 84 (Dr. and C.-dr.). 



This ground lies just to the eastward of the Hand Deeps, and at a 

 distance of two to three miles from the Eddystone. The dredgings 

 were generally commenced on the line passing through the old and new 

 Eddystone Lighthouses. 



Bottom-deposit. Coarse gravel mixed with fine sand. 



The texture, as indicated by percentage composition, is as follows, in 

 the sample taken at haul 84 : — 



II. Coarse Gravel ... ... ... 47*6 per cent. 



III. Medium Gravel ... ... ... 14*o „ 



IV. Fine Gravel 7-5 



V. Coarse Sand ... ... . . . 4'0 „ 



VI. Medium Sand 5-9 



VII. Fine Sand 17-7 



VIII. Silt 2-8 



[84. Average grade of sample, 3704. Percentage of carbonate of 

 lime in whole sample, 34'66. Highest percentage occurs in IV., 

 which contains 64'90. In 84 VI. Foraminifera are not numerous. 

 Twenty-one were counted in 0'45 grams (seven grains) of this grade, 

 or 46 per gram. In 84 VII. Foraminifera are not numerous. In 

 these grades the following foraminifera were found, arranged in order 

 of frequency : — Truncatulina lobatula, Textidaria gramcn, liotalia 

 heccarii, Planorhulina mcdiierranensis, Discorbina rosacea, MilioliTui 

 hicornis, Bolivina dilatata, Miliolina scnmiulum, Bulimina pupoidcs, 

 Lagena orhignyana, Nodosaria sp., Polymorphina lactea. In all, twelve 

 species. — R. H. W.] 



Shells are plentiful. For list see p. 422. 



The principal difTerence of texture between this sample and that of 

 Ground IX., which seems to be of importance, is the larger percentage 

 of sand and silt in the present case, 18 per cent, and 3 per cent, 

 respectively, as against 10 per cent, and 1 per cent, on Ground IX. 



As will be seen by comparing the two faunas, the great difference 

 between them is the presence or greater abundance on the present 

 ground (XI.) of species typical of the fine sand grounds, which species 

 are scarce or absent on Ground IX. Since the general nature of the 

 fauna of the two grounds (IX. and XI.) is very similar, I shall assuiue 

 in the following account of Ground XI. that the reader is acquainted 

 with the nature of the fauna of Ground IX., which is the typical 

 coarse gravel fauna, and shall confine myself to pointing out the 

 differences between the two grounds. This method of treatment 



