FKOM THE EDDYSTONE GROUNDS TO START POINT. 513 



on Ground X, which are not entirely occupied by Ophiothriv frayilis. The 

 species extends south of these grounds to Ground VII., where in some 

 hauls it is still moderately plentiful. On the gravel to the north-west 

 of the Eddystone (Ground XI.) specimens were taken only in haul 47, 

 whilst on the gravel to the souLli-west (Ground XIII.) only one or two 

 very small ones were seen, although on both these grounds the general 

 fauna is very similar to that of Ground IX. The specimens were found in 

 most cases attached directly to the gravel, with which their bases were 

 covered when they came up, but were sometimes also attached to shells. 



The only other record of the species was of two small specimens 

 attached to a shell in haul 92 on the fine sand of Ground I., so that it 

 may be regarded as practically absent from all fine sand grounds, as 

 well as from the Bolt Head and Prawle Grounds. (Chart XVI.) 



Ascidiclla venosa. Occasional specimens only were taken. These 

 were on Grounds IV., XI., and XVI. 



Ascidiella scahra. Although some specimens of A. scabra have been 

 met with on almost every ground examined, when the question of 

 abundance is considered it is found that the species has a very definite 

 and characteristic distribution. It occurs in greatest abundance on the 

 fine sand grounds, being specially numerous where the hydroid 

 Sertularella Gayi is plentiful, its favourite situation being at the base 

 of the stem of the hydroid. On the coarse grounds near the Eddystone, 

 where Sertularella seldom occurs, specimens of Ascidiella scahra are 

 only rarely seen, and are then attached either to shells, to the tubes of 

 Cliaetoptcrus, or on the backs of Inachus dorsettensis. On the Bolt Head 

 Shell Gravel one or two were seen in hauls 20 and 107 only, and the 

 species was never taken on the Prawle Stony Ground. (Chart XVI.) 



Ascidia deprcssa (Garstang, Journ. Mar. Biol. Assoc, Vol. II., p. 125). 

 Not uncommon on the Bolt Head Shell Gravel, attached to shells. 

 With the exception of an occasional specimen on the Prawle Stony 

 Ground the species was not elsewhere taken. 



Ascidia mentula. Taken once on the Bolt Head Shell Gravel. 



Ciona intestinalis. Occasional specimens attached to shells on 

 Grounds II., VII., XIV., XVII., and XVIII., being most freciuent on 

 XVIL, the Bolt Head Shell Gravel. 



Conqjound Ascidians. These have not been identified. A species of 

 Botryllus was not uncommon, and a Didemnid was plentiful on Ccllaria. 



Fishes. 



As the trawl was only used on a few of the grounds, the list of fishes 

 is very incomplete. I shall enter into no discussion on the subject of 

 their distribution, as my colleague, Mr. Holt, is engaged in a study of 



