POLYCILETA OF PLYMOUTH. 597 



POLYCH^TA. 

 SYLLID^. 



ExoGONE GEMMiFERA Pagenstechei" : Mcintosh, Mon. Brit. Ann. II. 1, 

 1908, p. 151. 



Plymouth. Common on the shore amongst the roots of Laminaria 

 and other weeds, in the Sound and on the coast outside. Frequent 

 in dredgings from the Sound. It also occurs in dredgings from 

 deeper water, e.g. 2 miles off Yealm Point in 15 fms. and off the 

 Eddystone in 30-35 fms. 



Breeding : A number of specimens found amongst Ascidians 

 from the piles in Millbay Dock in June carried eggs and embryos 

 in different stages of development. 



Torquay. Not uncommon amongst sea-weeds from half-tide 

 mark downwards [Elwes, Joum. M.B.A., vol. 8, 1908, p. 197). 



Sph^rosyllis hystrix Claparede : Mcintosh, Mon. Brit. Ann. II. 1, 

 1908, p. 157. 



Plymouth. Frequent in dredgings from the Sound ; occasional 

 specimens amongst roots of weeds from the shore. 



Sph.^rosyllis ovigera Langerhans : Wurmfauna v. Madeira, Zeitschr. 

 Wiss. Zool. XXXII. 1879, p. 567. 



Plymouth. In the Sound near New Grounds Buoy. Several 

 specimens have been taken. 



The species seems to be cjuite distinct from 8. hystrix as well as 

 from S. 'pirijem, Claparede. The palps are very broad and the 

 median tentacle is in a line with or more generally in front of the 

 anterior eyes, as figured and described by Langerhans. The body 

 is always coated thickly with sand and mud, which enables the 

 specimens to be separated at once from the *S. hystrix found in 

 the same material. The body is covered with papillae. 



Sph^rosyllis erinaceus Claparede, var. : de St. Joseph, Ami. Polych. 

 Dinard ; Ann. Sci. Nat. Zool. 1886, p. 207. 



Plymouth. Common amongst roots of Laminaria from Eum 

 Bay. 



the specimens differ from the descriptions and figures of Claparede 

 and de St. Joseph in having the two anal cirri large and much 

 swollen at the base. 



Breeding : A specimen obtained in June had four large eggs on 

 each segment from Seg-t. 9 backwards. The eggs were carried on 

 the dorsal side of the segment. On the segments anterior to Seg-t. 9, 

 four round tubercles were present on each, in positions corre- 

 sponding to those occupied by the eggs. 



