390 ON THE FAUNA AND BOTTOM-DEPOSITS NEAP. THE 30-1'M. LINE 



abundant, fixed iu the sand by their root-fibres; Antennularia antennina 

 and ramosa are fairly common, fixed in the sand by "sponge-like masses 

 of interlacing fibres" (Hincks) ; whilst jhjlaophenia myriophyllMu, fixed 

 iu a similar way, also occurs, though not frequently. 



The tubes of the polychaite Thclejms (cincinnatus?) serve as an attach- 

 ment for the hydroid Scrtularclla Gayi, which is the commonest and 

 most typical hydroid on the ground, whilst to the base of the hydroid 

 Ascidiclla scabra and Sabella pavonina, are attached. Seriularella poly- 

 zonias, Eudendrhiin ramosum, Boitgainvillia ramosa, Ohelia dichotoma, 

 and Clytia Johnstoni also occur attached to other hydroids, or to poly- 

 chaete tubes. Halccium halccinum and //. Beanii are represented 

 by one or two colonies only in a haul, or are entirely absent, and 

 H. halecimim, at any rate, must be regarded as an immigrant from 

 coarser ground. 



Stray tubes of Chaetopterus variopcdatus were taken in hauls 82 and 

 92 only, and are also clearly immigrants from neighbouring grounds. 



Of the other fixed species Alcyonium digitatum only occurs in 

 moderate quantity, and the colonies, generally attached to Cardium 

 cchinatum shells, are small. Epizoanthus incrustatus, which forms a 

 feature of the outer trawling-ground (Ground II.), has never been 

 taken on the inner. The polyzoa Bicellaria ciliata, Scrupocellaria 

 scruposa, and Cellepora aviaUaris are found attached to hydroids, but, 

 owing to the absence of shells, there are few incrusting polyzoa. 



Wandering species. Owing in all probability to the scarcity of fixed 

 and burrowing forms to serve as a food-supply, the number of wander- 

 ing species is also small. 



Pecten opercularis is scarce, and Astericcs ruhens and A. glacialis, 

 which generally are found feeding on the Pecten on neighbouring 

 grounds, are never present in numbers. There are usually a few 

 Ophiura ciliaris, but Opliiothrix fragilis is only represented by small 

 specimens at the roots of Cellaria or hydroids. Palmipes placenta 

 was taken in one haul only (82). 



Eupagurus Bernhardtis (with Sagartia ^:)«?'«si^zca or Hydr actinia 

 echinata on the Buccinum undatum shells which they inhabit), Galatliea 

 dispersa and Porcellana longicornis are the only Decapod Crustacea which 

 can be considered common on this ground. There are a few examples 

 only of Sfenorhynchus longirostris and Inachus dorsettensis, which live 

 amongst the hydroids, whilst Maia squinado and Eiirynome aspera were 

 taken twice. 



The fish fauna is characterised by the abundance of Arnoglossus 

 laterna, Zeus faber, Trigla pini, Trigla gurnardics, Callionymus lyra, 

 and Gohins Jeffreysi. 



From the list of species it will be seen that haul 82 contains several 



