Clare Island Survey — Archiannetida and Pobjchaeta. 47 37 



Syllis (Ehlersia) cornuta Kafchke. 



190S. S.c. Mcintosh, p. 200. 



This species usually lives in empty shells, which it shares with hermit 

 crabs or Gephyrea like Plmseolion strombi or Aspiclosiphon Mullcri. I also 

 found one sharing a tube with Pcctinaria ccuricoma. 



Mature specimens were found in August. In September a posterior part 

 of the body of a specimen was taken in the surface tow-net in Bofin Harbour, 

 which may represent a bud of this species. There is no sign of cephalization, 

 except that the 1st setigerous segment has no swimming setae, but only a 

 spine in the dorsal region of the foot. The alimentary canal is degenerate, 

 and the muscular system well-developed. 



In the 11 posterior segments there is a simple bifid seta present in both 

 the dorsal and ventral region of each foot. 



The setae with short tips are distinctly bifid, and those with elongate tips 

 are longer and slenderer than is usual in S. cornuta. The setae, as a whole, 

 show more resemblance to those of Ehlersia ferrugina, Langerhans (vide 

 p. 38), than to & cornuta, but the dorsal cirri are distinctly moniliform. 

 The changes which take place in the setae on attaining maturity have not 

 yet been adequately studied. On the whole, I think this bud belongs to 

 & cornuta. Similar buds without heads have been noted in Syllis {Raplosyllis) 

 spowjicola Grube, and Syllis {Ehlersia) rosea Langerhans. 



Habited. — Clew Bay — Dredged on 4 occasions in 10-24 fms. Bofin 

 Hakbouk — Bud in surface tow-net. Dredged in 15-16 fms., 

 in shell of Trivia europaea, with Plmseolion strombi. 



Distribution. — Great Britain ; Spitzbergen ; Scandinavia ; France ; 

 Madeira ; Mediterranean ; South Africa. 



Syllis (Ehlersia) simplex Langerhans. 



1879. Ehlersia (Syllis) simplex. Langerhans, p. 538. 1881. E. s. 



Langerhans, p. 104. 1886. Syllis {Ehlersia) aesthctica. de St.-Joseph, 



p. 156. 1908. Syllis Cunninghami. Mcintosh, p. 195. 



This species is characterized by the presence in certain of the segments of 

 one or two dorsal setae much thicker and stronger than the rest. The tips of 

 the setae are simple, and the edge is conspicuously spinous. The terminal 

 pieces of the thicker setae are frequently absent. This form seems to have 

 been first described by Langerhans, who found it at Madeira and the Canaries in 

 1879 and 1881. In 1886 de St.-Joseph described it as a new species, without 

 comparing it to Ehlersia simplex. De St.-Joseph's specimen was larger than 

 those of Langerhans, and the cirri had more segments, but in the structure 



