TRANSACTIONS. 



I. — Observations upon the Structure of a Genus of Oligochceta belonging to the Limicoline 

 Section. By Frank E. Beddard, M.A., F.R.S.E., Prosector, and Davis Lecturer 

 to the Zoological Society of London. (With a Plate. ) 



(Read 16th December 1889.) 



Some time since I published in the Transactions of this Society a paper upon 

 Phreoryctes ; the present paper is the second of what I hope will be a series of memoirs 

 upon the structure of the Oligochseta Limicolse ; this will be a parallel series to that upon 

 the Oligochseta Terricolae, which is being published by me in the Quarterly Journal of 

 Microscopical Science* As I took pains in my paper upon Phreoryctes to point out, in 

 accordance with views previously expressed by myself and by others, that it is impossible 

 to draw a hard and fast line between those two groups of Claparede, it may seem rather 

 illogical to retain this classification — if only in the title of a paper ; I do so simply as a 

 matter of convenience, and without in the least desiring to revive these old divisions of 

 the Oligochseta ; indeed the genus Moniligaster, which is treated of in the present com- 

 munication, is by most naturalists regarded as an earthworm ; in many points it does 

 undoubtedly agree with certain terricolous genera ; but as its affinities, into the discussion 

 of which I shall enter later, seem to me to be more with the Lumbriculidse, I put it into 

 the Limicoline series ; it is useful to have a name corresponding to " earthworm " for 

 those Oligochseta which are not earthworms, and are for the most part aquatic, and I 

 therefore use that term. 



The material upon which this paper is based I owe to the kindness of Mr H. E. 

 Barwell, who collected the specimens in Luzon ; some were better, others not so well 

 preserved. 



I. Historical. 



The genus was first recorded by Perrier [10] in a paper published in 1872 ; in 

 this he gave a tolerably full description of the anatomy of Moniligaster Deshayesi ; he 



* See vols, xxviii., xxix., xxx. 

 VOL. XXXVI. PART I. (NO. 1). A 



