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



Montacuta siilisti'iata. On Spatangus 

 piirpurcKs. 



Lima Loscombii. Fairly plentiful in 10. 



Pecten tigrinus. In 13 only. 



,, maximus. One or two in 13 and 14. 



,, ojicrcularis. P'ew, mostly small 

 specimens. 



Chiton asellus. In 13 only. 



Emarginula reticnlata. Few. 



Aporrhais pes-pelecani. In 87 only. 



Aegirus punctilucens. One specimen in 

 10 only. Tins was very 

 pale in colonr, and no 

 green specks were to be 

 seen. Small specimen. 



Shells. 

 Tellina crassa. 



Lutraria cUiptica. 



Tajjcs virginea. Numerous. 



Artemis exoleta. Numerous, especially 



in 99. 

 Astarte sulcata. 



Cardium norvegicum. Numerous. 



Pectunculus glj'cimcris. Small onl}'. 

 Lima Loseumbii. 

 Pecten maximus. 



, , ojiercularis. 

 Dentalium entalis. 

 Aporrhais pes-pelecani. 



POLYZOA. 



Cellepora ramulosa. In 99 only. 

 Crisea ramosa. In 13 only. 

 Idmonea serpens. In 13 only. 



Incrusting polyzoa not very numerous, 

 though a good many species are repre- 

 sented. For list see Table VI., p. 534. 



TUNICATA. 



Ascidiella scabra. A few in 87 only. 

 Molgula oculata. A few only. 

 Botryllus, sp. 



Cephalochorda. 



Am[ihioxus lanceolatns. A small specimen 

 in 87. 



Ground XVII. The Bolt Head Shell Gravel. 



Hauls 1, 6, 7, 21, 43, 44, 61, 62, 68, 105, 106, 107. 27, 28. 20, 60 

 (all hauls of Dredge. Canvas-dredge at 105 and 106). 



The position of this ground, which lies south of Bolt Head, will be 

 seen from the charts. The hauls enumerated above have been combined 

 as one ground, though further investigation would probably lead to a 

 division into at least three. This is indicated in the enumeration of 

 the hauls by the separation of 27 and 28 and of 20 and 60 from the 

 other numbers. The two deepest hauls (27 and 28), and the two to 

 the westward of Bolt Head (20 and 60), show several differences from 

 the typical shell-gravel hauls. 



Bottom-deposit. Clean shell gravel. 



Samples taken at 105 and 106 have the following texture : — 



[105. Average grade of sample, 4 



498. Percentage of carbonate of 



