FROM THE EDDYSTONE GROUNDS TO START POINT. 389 



Ground I. The Inner Eddystone Trawling Grouisd. 



Fiends. 50 (Dr.),* 51 (Dr.), 81 (B.-tr.), 82 (B.-tr.), 92 (O.-tr. and 

 C.-dr.). The approximate limits of this ground are, on the north the 

 28-fathom line, south the 33-fathom line, west the Eddystone Grounds 

 (comprised iu a circle of four miles radius, with the lighthouse as 

 centre), and east, a line drawn north and south about nine miles east 

 of the Eddystone. (Chart I., Ground I.) 



Bottom-deposit. Fine sand. The texture in haul 92 was found 



to be : — 



IV. Fine Gravel 



V. Coarse Sand 



VI. Medium Sand ... 



VI r. Fine Sand 



Vlll. Silt 



[92. Average gYade of sample, 6071. Percentage of carbonate of 

 lime in whole sample, 17'41. Highest percentage occurs in iV., which 

 contains 82-43 per cent, but this and V., containing 74'40 per cent., 

 may be passed over as constituting but a small portion of the whole 

 sample. VI. contains 58'00 per cent. A tine-textured deposit owing its 

 low percentage of carbonate of lime to the fact that VII., which forms 

 90'9 per cent, of whole sample, only contains 14"63 per cent, of CaCog. 



Triassic material is largely present, some Devonian and no Eddystone 

 reef. 



Foraminifera are fairly plentiful. The following are the species 

 present in VI. and VII,, arranged in order of frequency : — Botalia 

 hecearii (greatly predominant), Miliolina seminulum, Iruncatidina 

 lobatida, Textularia f/rarnen, Bidimina inqwidcs, Discorhina rosacea, 

 Bolivina punctata, Miliolina hicornis (reticulate variety). In all eight 

 species. — R. H. W.] 



Unbroken shells were scarce, with the exception of Cardium echin- 

 atuni shells. 



B\Lrrowing species. Astropectcn irregularis, Cardium echinatnm,,] and 

 Dcntalium cntale are the common burrowing forms on this ground. 

 Corystes cassivelaunus was present in haul 92 only, where, however, 

 it was plentiful. {Cf. p. 397.) 



Fioxd species. The fact that few shells are present causes iixed 

 species to be scarce. Ccllaria Jistulosa and sinuosa are moderately 



• Dr. = Drcdge. B.-tr. = Beam-trawl. O.-tr. = Otter-trawl. C.-dr. ^Drctl^e fitted with 

 canvas bag. 



t The presence of Cardmm echinatum on this ground and in the lino sand of the outer 

 trawling-ground is inferred from the fact that fresh valves, often still joined together, are 

 a constant feature of the hauls, and are the only shells at all [)lentiful. The species is 

 known {cf p. 500) to be a sand-dwelling one. 



