59 



shorter than the median tentacle. Patches of ciHa behind feet. 

 Intestine without constrictions. Two articulated cirri of three 

 and six articulations (obviously damaged) at end of body. Total 

 length about 1 mm. 



Foot with single cirrus, carrying capillary bristles, apparently 

 projecting above and below the cirrus. 



Aplysia punctata, Cuvier. Young specimens were obtained 

 from the local rocks on 19th January, 1915. Older and larger 

 individuals now occur (June), and are spawning. This is the first 

 time these have been obtained since 1912, when the species was 

 exceptionally abundant. Mr. Nathaniel Colgan, in the Irish 

 Naturalist of Aug. -Sept., 1914, page 170, notes the occurrence in 

 remarkable numbers of A. ])unctata in Irish waters between Shen- 

 nicks Island and Skerries mainland in 1908, and a second abund- 

 ance in 1913, a period of five years. From the growth made by 

 small individuals kept in the tanks of the Laboratory and their 

 spawning in June, coux3led with a total disappearance from the 

 district in the following year, it would api^ear that A. punctata 

 lives only for one year, and after reproduction dies. 



Pleurobranchus plumula (Montagu). Twelve specimens of 

 about one centimetre in length were obtained under stones near 

 low- water mark to the north side of CuUercoats Bay on the 1st of 

 February, 1915. 



