POLYCH.ETA OF THE L.M.B.C. DISTRICT. 151 



Family. — C apitellid^ . 

 * Capitella capitata, (Fabr.). 



Hab : Port Erin, and Lavan sands, Bangor. 

 Very numerous amid decaying Fiicus under overturned 

 boulders. 



Family. — Telethusid/E . 

 ArenicoJa marina, (Linn.). 

 Hab : S, E, NB, H, L, B, P, M, Mp. 

 Abundant everywhere, between tide marks wherever a 

 patch of sand or mud occurs. 



Note on the Embryology of Arenicola and Scoloplos 

 (Plate XIV.) 



Max Schultze in 1856 {Entwickelung von Arenicola) 

 described certain egg-masses and embryos found on the 

 Cuxhaven shore as belonging to Arenicola. In 1887 Cun- 

 ningham and Eamage figured and described identical em- 

 bryos in the Trans. Roy. Soc. of Edinburgh, Vol. XXXIII, 

 part 3, {Pohjclueta Sedentaria of the Firth of Forth), but 

 in the text they point to certain facts, chiefly connected 

 with characteristics of form in the larvae, which inclined 

 them to believe that the parent was in reality Scoloplos 

 arniiger and not Arenicola as Bchultze averred. These 

 authors w^ere, however, unable to describe either the 

 embryos or the manner of spawning of Arenicola, though 

 they give a sketch of innnature ova taken from the body 

 cavity in February. This gap I am fortunate enough to 

 be able to fill up from observations made in 1890 — 91, and 

 I am also able to confirm in its entirety, Cunningham 

 and Eamage's correction of Schultze. 



On 2nd March, 1890, I procured on the sandy beach at 

 Egremont several small pear-shaped brownish egg-masses 

 and a few larger green ones about the size and shape of a 

 large grape. The latter were invariably associated with 



