HEKATEROBEANOHUS SHRUBSOLII. 175 



Hekaterobranchus Shrubsolii. 



A New Genus^ and Species of the Family 



SpionidsD. 



By 



Florence Buclianan, 



Student of University College. 



With Plates XXI and XXII. 



This worm was found at Sheppey by the members of the 

 University College Biological Society during an expedition 

 made there in July, 1889. It appears to have been already 

 known to naturalists living at Sheppey, but no one had tried 

 to identify it. Not being able to find any published account 

 of it, I believe it to be as yet undescribed, and have therefore, 

 at Professor Lankester's kind suggestion, undertaken the exa- 

 mination and description of it.^ 



Occurrence. — The worm was always found associated with 

 Haplobranchus (described by Dr. Bourne in the 'Quart. Journ. 

 Micr. Sci.,' 1883), and occurs therefore in soft mud at the 

 bottom of gullies, usually overlain by an inch or so of water. It 

 is not so tenacious of life as Haplobranchus, and is hence not 

 always to be found in mud containing Haplobranchus. Its 



* See, however, note at the end of this paper. 



' I have been greatly helped in my investigations by the kindness of Mr. 

 Shrubsole, of Sheerness, who has sent me up from time to time, as I required 

 it, fresh material. I will take this opportunity of thanking him for the kind 

 way in which he has allowed me to encroach upon his time and patience ; for 

 collecting and searching through mud to see that a particular animal,'and that 

 a very minute one, is present in it is no very easy nor interesting task. 



