FEOM THE EPDYSTONE GROUNDS TO START POINT. 511 



Froneomenia aglaopheniae was described by Kowalevsky and Marion 

 (No. 62) from specimens obtained at Marseilles, and has since been 

 taken by Pruvot (No. 97) at Banyuls (33-44 fathoms). In both cases 

 the animal was coiled around the stem of A. myriophyllum. The 

 specimens from the Eddystone Grounds are, so far as I am aware, the 

 only ones which have been taken outside the Mediterranean. 



NUDIBRANCHIATA (Table VI., p. 533). By far the most numerous 

 nudibranchs taken were Doto fragilis and Lamellidoris oUonga. The 

 former species was abundant on grounds where hydroids were plentiful, 

 especially on the coarse gravels to the westward of the Eddystone, 

 where Halecium halecinum was the characteristic species. On the fine 

 sand grounds Doto pinnatijida and Doto coronata, which were not taken 

 on the gravel, were also met with. Lamellidoris ohlonga is associated 

 always with Cellaria Jistulosa and sinuosa, and is present on the grounds 

 where these species are abundant. {Cf. Garstang, Jour. Mar. Biol. Assoc, 

 III., p. 220.) Occasional specimens only of other nudibranchs were 

 taken, as will be seen from Table VI., and also from the descriptions 

 of the grounds. 



Most of the specimens were identified by Mr. W. I. Beaumont. With 

 regard to the geographical distribution of these forms I am unable to 

 add anything to the information given by Norman in his Revision of 

 the Mollusca (No. 91). 



POLYZOA. 



For nomenclature and for geographical distribution (Table VI., p. 534) 

 I have relied entirely upon Hincks {History of British Marine Polyzoa). 

 The specimens in several of the earlier hauls were identified by Mr. T. 

 H. Taylor. The distribution of only a very few of the species of Polyzoa 

 on the grounds investigated offers any points of interest. 



Cellaria fistulosa and Cellaria sinuosa. Both these species are abun- 

 dant on the fine sand grounds in the neighbourhood of the Eddystone 

 (Grounds I., III., IV., VI., VIIL), where they form a marked and 

 characteristic feature of the fauna. Whenever the trawl is used on 

 these grounds masses of Cellaria are taken, and the polyzoan, which is 

 attached either to small pieces of shell or directly to the sand by means 

 of its root-fibres, affords a fixing-place for the smaller hydroids {e.g., Clytia 

 Johnstoni) and for the nudibranch Lamellidoris ohlonga. At the bases 

 of the colonies the polyzoon Scrupocellaria scruposa is often attached, 

 and very small specimens of Ophiothrix fragilis find a hiding-place. 

 The extreme scarcity of Cellaria on the fine sand of the Outer Trawling 

 Ground (II.) is noteworthy {cf p. 393), as well as its scarcity on Ground 

 v., to the north of the Eddystone. On the gravels to the westward of 



