FROM THE EDDYSTONE GKOUNDS TO START POINT. 



413 



Bottom-deposit. A mixture of coarse gravel with fine sand. The 

 texture is shown by the percentage composition as follows : — 



I. Stones ... 



II. Coarse Gravel . 



III. Medium Gravel. 



IV. Fine Gravel 

 V. Coarse Sand 



VI. Medium Sand 



VII. Fine Sand 



VIII. Silt 



09 per cent. 



44-4 „ 



14-0 „ 



10-2 „ 



7-5 „ 



5-5 „ 



1(3-2 „ 



1-2 „ 



69-5 per cent. 



y 30-4 



Percentage of carbonate of 



[94. Average grade of sample, 3'66. 

 lime in whole sample, 1771. Percentage in each grade except I., 

 which may be neglected, uniformly low ; highest in VI. at 2914 per 

 cent. In 94 II. 75 per cent, by weight of the gravel is Triassic, 

 9 per cent, derived from the Eddystone reef, 16 per cent, is Devonian, 

 In 94 III. 69 per cent. Triassic, 18 per cent. Eddystone reef, 13 per 

 cent. Devonian. Some amorphous silica, probably flint and cretaceous, 

 is present in this and many other samples, and is referred to elsewhere, 

 (p. 384.) Foraminifera are fairly numerous in VII. and numerous in VI. 

 The following species are present, following order of frequency : — 

 Rotalia ieccarii, Truncatulina lohaiula, Discorhina rosacea, Miliolina 

 seminulum, Flanorbulina mcditcrranensis, Textularia gramen, Bulimina 

 piqjoides, Lagena striata, Spiroloculina plamdata, Miliolina hicornis, 

 Lagena apiculata. In all, eleven species. — R H. W.] 



Shells were very numerous on this ground. (See list, p. 416.) The 

 fauna is varied and abundant, the nature of the ground offering great 

 advantages, especially to fixed species. 



Burrowing species. Ebalia tumefacta and Ebalia tuherosa* were very 

 numerous, as well as small specimens of Atelecyclus heterodon. The 

 other burrowing animals were one small specimen of Astropecien 

 irregularis and one specimen of Cardium norvegicum. 



Fixed sjjccics. Hydroids which root themselves directly in the 

 bottom-deposit are represented by one or two specimens of Antcnnu- 

 laria antennina only, and Ccllaria is also practically absent, one small 

 piece of C. fistidosa only having been obtained. 



One of the chief characteristics of the ground, and one which has 

 a marked influence on its general fauna, is the presence of large 

 numbers of Chaetopterus variopedatus. The large, leathery tubes of 

 these worms are found either attached to shells, joined together into 

 masses of considerable size, or, less frequently, apparently living freely 



* Mr. Ciarstang tells mc that he lias obscrvcfl the burrowing of Ebalia in gravel in tlic 

 Liiboratory. Tliey fin not burrow doojjly, but rcinnin witli the fmnt jiart of the i'ai'a](ace 

 just above the surface. 



NEW .SEUIES, — VOL. V, NO. 4. 2 E 



