432 ON THE FAUNA AND BOTTOM-DEPOSITS NEAR THE 30-FM. LINE 



Ground XVI. The West Eddystone Clean Shell Gravel. 



Hauls. 86 (Dr.), 87 (Dr. and C.-dr.), 10 (Dr.), 13 (Dr.), 14 (Dr.), 

 98 (Dr.), and 99 (Dr.). 



Immediately bordering the rocky ground of the reef, north, west, and 

 south of the Eddystone, at a distance of from half to one mile from the 

 lighthouse, is a strip of clean shell gravel upon which the fauna is very 

 scanty, though at the same time very characteristic. 

 Bottom-deposit. Clean shell gravel. 

 A sample taken at haul 87 had the following texture : — 



II. Coarse Gravel ... ... ... 173 per cent. 



31-7 „ 

 19-3 „ 

 10-5 „ 

 14-9 ., 

 5-2 „ 

 1-1 „ 



[87. Average grade of sample, 4*1 51. Percentage of carbonate of 

 lime in whole sample, 72-25. Highest percentage occurs in IV., which 

 contains 79'60 per cent. This deposit lying on the northern boundary 

 of the Eddystone reef, just below the 30-fathom line, is the one and 

 only sample in which Eddystone reef materials predominate over the 

 other rock constituents. In grade 11. no rock fragments but those 

 derived from the reef are present, while in grade III. Eddystone 

 material stands at 74 per cent, and Trias at 26 per cent. Foraminifera 

 are numerous; in VII. 81 individuals were counted in 013 grams 

 (2 grains), or 623 per gram. The Miliolina greatly predominate. The 

 following species were found in VI. and VII., arranged as before in 

 order of frequency : — Miliolina seminulum, liutalia beccarii, Textularia 

 gramen, Truncatulina lohatula, Miliolina hicomis, Miliolina irigonula, 

 Spiroloculina plamdata, Lagena orhignyana, Spirillina vivipara, JDis- 

 corbina rosacea. In all, ten species. — E. H. W.] 



Large unbroken shells were not numerous. 



Haul 99 was partly on rocky ground. 



Burrovjing species. The most characteristic species are Spatangus 

 jjurpiorens, Echinocyamus pusilhis, Eupolia curta, Amphioxus lanceolatus, 

 and Glycera convoluta. Several bivalve molluscs nut taken on other 

 grounds were found here (see p. 433). Occasional specimens of Poly- 

 gordius were obtained, and 'fercbcllid tubes were numerous. 



Fixed species. These were very scarce. Lafoea dumosa, var, robusta, 

 was the hydroid most frequently taken, other species being represented 

 by occasional small pieces only. Sarcodictyon catenata attached to 



