1924. Delap. — Notes on the Plankton ofValcntia Harbour. 5 



CTENOPHORA. 



Pleurobrachia pileus : — 1906. — lUentiful in March, also in August, Septem- 

 ber, October and November. 1907. — A few in March, May, June 

 and |ul\-, becoming very numerous in August ; in crowds on August 

 24. 1908. — A few early in May, then in crowds till end of July. 

 1909. — Plentiful in June, July and in September. 



Bolina norvegica : — 1906. — A few in ^Nlarch ; plentiful in June. 1907. — 

 Numbers in August. 1908.— Many during July. 1909.— Many 

 throughout June and again in September. 



Beroe ovata : — 1906. — Plentiful in June; a few in September; one in 

 December. 1907. — One in :\Iay ; numbers in August. 1908.— Some 

 ver>^ large specimens in July. 1909. — A lew in June ; plentiful in 

 September. 



MOLLUSCA. 



lanthina communis : — 1906. — On January 26 one small lanthina 

 ? exigua was found on August 19 ; two /. communis at Cooscroum. On 

 September 2 two were picked up on Beginnis Island, Blasket Sound. 

 One specimen found on Valentia, October 30. 1907. — One at Coos- 

 croum on May S. 1907. — A large specimen at Valentia on July 28. 

 1918. — A few found with Velella. 1919. — A number stranded with 

 Velella. 1921. — On January 17, one was found. 1923. — September 

 II at Dohilla strand one large lanthina, alive; on September 21 

 another live one with its lioat ; another large shell on September 23. 



Spirula Peronii : — 1906. — On February 17 one shell found on the rocks 

 at Keenagiveen. 1907. — Several at Cooscroum on [May 28 ; one found 

 on August 5. 1908. — One shell on February 5. 1923. — ^Two small 

 shells found at Duhilla. 



Limacina retroversa :— 1906. — In March and April, August, September, 

 October and November, present in small numbers 1907. — A few in 

 June, August, October, and November. 



Clio limacina : — 1906. — From r^Iarch to November not numerous at any 

 time. 1907. — In June, August, October and November. 1909. — ■ 

 A few in August. 



TUNICATA. 



Thalia democratica-mucronata : — 1906. — None. 1907. — None seen* 



1908. — -Thalia appeared in considerable numbers on July 30 ; very 

 plentiful from August 13 to z^. 1909. — None. 



Salpa runcinata-fusiformis : — 1908. — Plentiful, August 13-23. 1923. — 

 In July large drifts of Salpa, large specimens, nearly all the chain 

 individuals. On August i, at Dohilla, an immense drift of Salpa in 

 the bay (like porridge), and stranded thickly on each tide-mark; 

 as far as could be seen these were entirely the chain individuals 

 On August 13 a big drift in Valentia ; all were the solitary intermediate 

 stage. September 11, at Dohilla, a good many seen, and a few odd 

 ones up to September 16. 



