438 ON THE FAUNA ANH BOTTOM-DErOSITS NEAR THE 30-FM. LINE 



Chiton ascllus. Common. 

 Dentalium entalis. In 7, 28, and 20. 

 Pileopsis luingaricus. One specimen in 

 106 and 107 only. 



Emarginula reticulata. In 21 and 27 only. 

 Trochus zizyphinus. One small in 27 only. 



,, granulatus. One in 27 only. 

 Lainellaria perspicua. One in 28 only. 

 Nassa incrassata. In 20 only. 

 Bucciuuni undatum. Not uncommon. 

 Fusus islandicus. Four or five in 105 and 



one ill 107. 

 Cypraea europaea. In 27 only. 



Tritonia Honibergi. In 27 and 28 only. 

 Dendronotus arborescens. In 28 only. 

 Doto coronata. In 28 only. 



Shells. 



Solen ensis. Few. 



Solecartus caudidus. In 20 and 28 ; single 

 valves. 



Tellina crassa. One in 105. 



Lutraria elliptica. Frequent. 



Tapes virginea. Not frequent. 



Venus fasciata. Not frequent. 



,, ovata. Common. 



Artemis exoleta. One in 105. 



Astarte sulcata. One in 106 only. 



Cardium norvegicum. Not frequent. 



Pectunculus glycimeris. Numerous. 



Pecten maximus. Very few, 



,, opercularis. Numerous. 



Trochus granulatus. Occasional. 



Aporrhais pes-pelecani. In 27 only. 



Natica nitida In 27 only. 



Fusus islandicus. In 105 and 107, not 

 uncommon. 



Ostrea edulis. Occasional shells. 

 POLYZOA. 



Branched forms almost absent. In- 

 crusting forms numerous. See Table V'^I. 



TUNICATA. 



Styelopsis grossularia. Small, squat variety 



on shells. 

 Ascidiella scabra. One or two in 20 and 



107 only. 

 Ciona intestinalis. Frequent, but not 



numerous. Attached to 



shells. 



Ascidia depressa. A few specimens, at- 

 tached to shells. 



,, luciitula. One in haul 1 only. 



Cephalochorda. 

 Aiiipliioxus lanceolatus. One in 28 only. 



Pisces. 



Lepadogaster bimaculatus. One in 106 



only. 



Ground XVII I. The Prawle Stony Ground. 



Hauls. 2 (O.-tr.), 3 (O.-tr.), 4 (Dr.), 45 (Dr.), 66 (Dr.), 65 (Dr.), 64 

 (Dr.), 63 (Dr.), 29 (Dr.), 30 (Dr.). 



This ground again could probably, with further investigation, be sub- 

 divided. The hauls all lie to the eastward of a line passing north and 

 south through Prawle Point, and are characterised by the presence of 

 stones, often of considerable size. The ground is very rough and 

 dredging upon it ditiicult. No samples of the bottom-deposit were 

 taken with the canvas bag, 



Burroiving species. Spatangus purpureus, Echinocyamus pusillus, and 

 occasional specimens of Elalia were the forms most frequently taken. 

 The boring mollusc Pholadidea papyracea was common in the Trias 

 rock of haul 4. Atckcyclus hcterodon was taken once, and an occasional 

 burrowing bivalve mollusc was found. 



Fic'^ed sp)ecies. It is, however, by its fixed species that the fauna of 

 this stony ground is specially characterised. The following species, 

 which were absent from the other grounds, or at most only very 

 occasionally met with, were present here, generally attached to stones: — 

 Corynactis viridis, Gorgonia verrucosa, Garveia nutans, Tidndaria indivisa, 



