FKOM THE EDDYSTONE GROUNDS TO START POINT, 393 



Ground II. The Outer Eddystone Trawling Ground. 



Hauls. 22 (O.-tr.), 23 (O.-tr.), 24 (O.-tr.), 25 (Dr.), and 104 (B.-tr. 

 and C.-dr.). The outer trawling ground extends southward from the 

 33-fathom line (10 miles south of the Plymouth Mewstone), and hauls 

 have been made to about the 35-fathom line. The fine sand, however, 

 which forms its bottom-deposit extends for a long distance into the 

 Channel. The area examined during the present investigation lies 

 between the Eddystone Grounds on the west and a line similar to 

 that bounding the inner trawling ground on the east. 



Bottom-deposit. As will be seen from Table II., this is the finest sand 

 ground examined. The composition in haul 104 was found to be: — 



IV, Fine Gravel ... ... ... O'l per cent. 



0-2 „ 



2-1 „ 

 95-8 

 1-9 „ 



[104. Average grade of sample, 6'998. Percentage of carbonate of 

 lime in whole sample, 15'80. The following are the species of Forami- 

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

 llotalia heccarii, Miliolina scminidum, Truncatulina lohcdula, Planorhu- 

 lina meditcrranensis, Discorhina rosacea^ Textidaria gramen, Miliolina 

 trigomda. E, H. W.]. 



Unbroken shells were scarce, with the exception of Cardium echinatum 

 shells. The ground is very barren, and all the five hauls made on it 

 yielded comparatively few specimens. The fauna is, however, well 

 characterised, and has many invariable and distinguishing features, 

 which mark it out from all the other grounds. 



Burrowing species. Astropecten irregularis, Cardiuvi echinatum,^' and 

 Nucula nitida are the commonest species. Corystes cassivelaunus, a 

 characteristic fine sand species, was only represented by one specimen 

 in haul 22. Echinocardium cordatum and Echinocyamus pusillus were 

 present in 104. The absence of Dentalium from the sand in the 

 sample taken at haul 104 is noteworthy. 



Fixed species. As on Ground I., these are scarce owing to the scarcity 

 of shells. The absence of species which fix themselves in the sand by 

 a mass of root-fibres is noteworthy, this kind being represented by one 

 colony of Antennidaria antennina in haul 25, and by an occasional 

 piece of Cdlaria, both species of the latter genus being, however, very 



* The evidence for the i)reseuce of this species is similar to tliat for its iircsence on 

 Ground I., viz., the constant capture of recent shells of the species and of shells of no 

 other kind. 



