Browne — Famid and Flora of Valencia Harbour, Ireland. 689 



Pteropoda. 



Limacina retroversa (Fleming). 



Limacina retroversa^ Pelseneer (1887). 



This species may be regarded as a regular inhabitant of the 

 harbour. It often occiuTed in dense shoals, and fonned a layer 

 of considerable thickness at the bottom of the tow-net can. 



1895. A few specimens were taken once in April. On May 6th 



a shoal entered the harbour and remained until the 

 l7th, when a sudden decrease took place. 



1896. It was very abundant during May, June, and July. 



Early in August it suddenly became very scarce, and 

 finally disappeared at the beginning of October. 



1897. It was taken fi'om June to December. Yery abundant 



in July and at the end of October. 



1898. It was seen from July to October, and again in December. 



Abundant at the end of July and during the early part 

 of October. 



Clione limacina (Phipps). 



Clione limacina, Boas (1886); Pelseneer (1887); M'Intosh(1898). 

 Clione horealis, Pallas. 



A few specimens of this Pteropod were occasionally taken in 

 the harbour, 1896. It occurred from the end of July to Sep- 

 tember 10th. Larval stages were found about 1|- mm. in length, 

 with median and posterior ciliated bands, as figured byM'Intosh 

 (1898; pi. ii., fig. 6), and also younger stages with three 

 ciliated bands. 



The adult stage was taken in August ; the largest specimen 

 measured 17 mm. in length. This is small as compared with 

 Arctic specimens, 35-40 mm. 



1897. A few specimens were taken from July 19th to October 



8th. Some were larval stages and others adults. 



1898, A few specimens seen in August; one in October; and 



one on December 26th. 



The home of this species is in the Arctic Ocean. It is not 

 uncommon in the northern part of the British area, but rarely 

 taken in the south. A solitary specimen was found by Leach 

 at Palmouth, which is its southernmost record. 



