688 Proceedings of the Royal Irish Academy. 



In the autumn of 1897 the young individuals formed a large 

 shoal in the harbour. They were also very abundant in the 

 same season of 1898. 



The largest specimen of Tomopteris was taken on May Ist, 

 1895. It measured, when alive, 55 mm. in length, with sixteen 

 pairs of parapodia, and about six rudimentary pairs on the tail. 

 The body contained a large number of ova. 



Amphipoda. 

 Parathemisto oblivia, Kroyer. 



This little Amphipod, kindly identified for me by Mr. A. 0. 

 "Walker, was taken often in the summer and autumn. At times 

 it became quite abundant, especially in August, 1896, and 

 September, 1897. All the specimens were very small, and 

 belonged to young stages. 



MOLLUSCA. 



lanthina communis, Lamarck. 



A solitary specimen was found stranded on the shore in the 

 harbour by the Misses Delap, on August 31st, 1896, and was 

 brought to the Laboratory. When placed in sea-water it soon 

 became active, and lived for three days. I found several clus- 

 ters of eggs, some of which had reached the veliger stage, with 

 a dark brownish spii'al shell. 



lantMna always remained fully expanded when the sun was 

 shining upon it, but a shadow suddenly thrown across the 

 aquarium would immediately cause the animal to contract. 



This Mollusc has often been recorded from the west coast of 

 Ireland. 



Atlanta, sp. ? 



Atlanta, M'Intosh, 1890, Ann. Nat. Hist., ser. 6, vol. v., p. 47, 

 pi. viii., figs. 3, 4. 



A single specimen taken on August 7th, 1896. The shell 

 agreed in general appearance with the figures given by 

 M'Intosh, who found his specimens at St. Andi-ews in Sep- 

 tember, 1888. 



