4Ti 04 Proceedings of the Uoyat Irish Acade 



m>). 



in Ballynakill Harbour, in 2-6 fins., whilst several fragments were dredged in 

 24 fins, in Clew Bay. The species has recently been described in detail by 

 Cerruti, and I have nothing to add to his description. 



Habitat. — Clew Bay— Dredged in 24 fms., on a bottom of sand and shells. 

 Ballynakill Harbour— Dredged in 2-6 fms. 



Distribution. — Naples ; Davis Strait. 



Paraonis (Paraonides) lyra sp. n. 

 Pis. IX, X, figs. 22 a-g. 



A mature male specimen belonging to a new species of Paraonis was 

 taken in the surface tow-net at midnight in June, in Ballynakill Harbour. 

 Two mature females were afterwards dredged in 1-2 fms. in New Harbour, 

 Galway Bay. also in June, and were studied alive. 



• The specimens are 12-20 mm. long, consisting of 90-105 setigerous 

 segments. The body is colourless, widest in the middle, and tapering 

 gradually towards each end. 



The head (fig. 22 e) is widest behind, rounded in front. On the anterior 

 margin is a low rounded papilla, provided with stiff cilia. The nuchal 

 organs are large and conspicuous, inclining backwards from the mid-lateral 

 region on each side towards the posterior margin. They are richly ciliated, 

 and are rendered conspicuous by the presence of brown pigment. No eyes 

 were observed in any specimen, though there was a certain amount of 

 yellow pigment on the head. The three anterior segments are provided 

 with capillary setae and dorsal cirri. The branchiae commence on the fourth 

 segment, and vary in number, the three specimens having eight, eleven, and 

 fourteen pairs respectively. In the specimen with fourteen pairs, the two 

 posterior pairs are small. The branchiae are richly ciliated. The dorsal 

 cirri are small in the anterior segments, but gradually increase in size, and in 

 the posterior segments are long and slender. The anal segment is rounded 

 and almost globular (fig. 22 c). It bears three slender subulate cirri, two 

 dorso-lateral, and one ventral median. A pair of cirri seem to be attached 

 I o the anterior ventral border of the anal segment ; but they probably 

 represent the posterior pair of dorsal cirri. 



In the anterior bundles the dorsal and ventral setae are almost equal in 

 length, and continue so to the end of the body m immature specimens. In 

 the mature male specimen the ventral setae begins to increase in length at 

 about the 15th-20th segment, whilst the dorsal setae become shorter. 



The setae in the male specimen taken in the surface tow-net are much 

 more prominent than in the females ; and in length they exceed the width 

 of the. body, especially in the posterior segments (fig. 22 e). The dorsal cirri 



