FROM THE EDDYSTONE GROUNDS TO START POINT. 



401 



Ground III. ; but incrusting Polyzoa, which were scarce on the latter 

 ground, now become abundant with the increase in the number of 



shells. 



Wandering species. All the important species on Ground III. are 

 present, but in addition Ground IV. has the following: — Porania 

 pulvillus (one in haul 39), Ophiura albida (one in 77), Opliiactis Balli 

 (seen in 40 only), Echinus acutus and esculcntus, Hyas coarctatus (in 

 39 only), Portunus pusillus* (in 39 only), Turritclla communis (in 39 

 only), Pectcn maximus, many Pccten opercularis, and with them an 

 increase in the number of Asterias glacialis and A. mbens. The 

 greater abundance of shells has already been noticed. All these 

 features indicate an approach to the coarser Eddystone grounds. 



Tiie fish fauna is much less numerous than on Ground III., but the 

 species present are all taken on that ground also. 



List of Species. Ground IV. 



FORAMIXIFERA. 



Tiuncatuliua lobatula. Ou hydroids, etc. 



PORIFEKA. 



Cliona celata. Boring shells, especially 

 Peden and Lutraria, 



Hydrozoa. 



Hydractinia echinata. On shell inhabited 

 by Eupagurus Bcrn- 

 hardus. In 34 only. 



Eudendrium ramosum. 



,, capillare. In 77. 



,, sp. Small species, not ca^Ji^ 



lare, 



Clytia Johnstoni. Plentiful. 



Campannlaiia Hincksii. On Halecium 

 and other hydroids. 



Lafoea dumosa, var. robusta. Abundant. 



,, fruticosa. In 77 only. 



Halecium halecinum. Fairly abundant, 

 gi'owing on shells and 

 on Chadopterus tubes. 



Halecium Beanii. Less abundant than 

 H. halecinum. 



Sertularella Gayi. Abundant, generally 

 on 2'olychaete tubes. 



Sertularella polyzonias. Less frequent 

 than S. Gayi. Gener- 

 ally ou shells. 



Sertularia argentea. Scarce. In 40 only. 



Hydrallmania falcata. A few colonies in 

 each haul. 



Not very abun- 



Antennularia antennina. 

 dant. 



Aglaophenia myriophyllum. Abundant, 



fixed in the sand. 

 Plumularia pinnata. In 34 only. 



,, setacea. In 34 and 77. 



,, Catharina. In 34 only. 



ACTINOZOA. 



Sagartia parasitica. On shells of Biiccinum 

 undatum, inhabited by 

 Eupagurus Bcrnhardus. 

 Not frequent. 



Adamsia palliata. On shells inhabited by 

 Eupagurus Pridcauodi. 

 Not frequent. 



Alcyoniuni digitatuni. Small colonies 

 only, often on living 

 Peden opercularis. 



Sarcodictyon catenata. Red variety. In 

 39 only. 



ECHINODERMATA. 



Astropecten irregularis. Very few speci- 

 mens. 



Porania pulvillus. One specimen in 39 

 only. 



Solaster papposus. Common in 77, not 

 frequent in other hauls. 



Henricia sanguinolenta. One or two 

 specimens in each haul. 



Asterias glacialis. | Common generally, 

 ,, rubens. i only small ones in 77. 



• Portunus depurator and P. ]msillus have been included under the head of wandering 

 species on account of their marked adaptation for swimming. At the same time both 

 species do sometimes burrow, although to what extent has never been determined. 



