Friend : Oligocha'ts of Great Britain and Ireland. 



II 



■Cha;togaster limnai l^aer. 

 Ophidonais serpentina iNIiiller. 



,, reckei Flocr. 



lirancliiodrilus semperi Bourne. 

 Nais ol)tusa Gerv. 



,, elinguis Miiller. 



heterocha-ta Benham. 

 Xaidiitm luteuni O. Schm. Harts- 

 liorne, in Derbysiiire, October 

 1911. 

 Dero latissima Bousfield. 

 ,, perrieri Bousfield. 



Dero obtusa Hdck. 



,, miilleri Bouslield. 



,, limosa Leidy. 



,, furcata Oken. 

 Vejdovskyella comata \'ejd. 

 Ripestes macrocha^ta Bourne 

 Slavina appendiculata LTdek. 

 Stylaria lacustris Linn. 



,, lomondi Martin. 

 Pristina equiseta Bourne, 

 longi.seta Ehrb. 



III. TUBIFICID.'E. 



This large and interesting family has been the subject of 

 much careful investigation. Tubifex has been the bugbear 

 here, as Lumbricus terresiris was among earthworms. It has 

 Ijeen very difficult to unravel the tangled skein, and much yet 

 remains to be done. The following list is compiled from the 

 author's paper on ' British Tubificidai,' presented December 

 20th, 1911, to the Royal Microscopical Society. The descrip- 

 tions of species new to science will be published in due course. 

 Southern's List contains 16 species under five genera. It 

 is to be regretted that much confusion has been introduced 

 through the recently adopted method of reckoning Hetero- 

 chseta, Spirosperma, and other genera as Tubifex. I revert 

 to the old order, adopted by Beddard, not in opposition to 

 changes wisely carried out, but because recent additions to 

 the family convince me that the old genera will have to be 

 retained, and possibly increased in number. In this section, 

 therefore, I have to alter several of Southern's names ; but 

 the type will shew which records are found in his list. The 

 number of species has been exactly doubled since 1909. 



Branchiura sowerbyi Beddard. 

 iMonopylepiiorus rubroniveus Lev. 

 ( = Vermiculus pilosus Goodrich). 

 JMonopylephoriis parvus Dit., 1904 ; 

 ' Zeit. Wi.ss. Zool.', 77, 427. 

 Kew. 

 CUtellio avenaviits Miiller. 

 Limnodrilus hoffmeisteri Clap. 

 ,, udekemianus Clap. 



,, parvus Southern, 



longus Bretscher. 



Limnodrilus aurostriatus Southern'. 

 aurantiacus Friend 

 (' The Naturalist,' iQii, No. 659, 

 p. 414). 



Liinnodrilits claparedianus Ratz. 

 Kew. 



Limnodrilus papillosus Friend. 



First described, with the three 

 following, in the author's paper 

 on British Tubificida-. — 



The main features are : — Length, 25-50 mm. Segments 

 90 and upwards. Opaque, sluggish, orange-coloured. Seta; 

 in front coarse, with upper tooth much longer than lower, 

 pharynx in segments 2-3, chloragogen cells begin in 6, hearts 

 in 8 and 9. Spermathecae striate, no duct, short penis sheath. 



Limnodrilus nervosus Friend. — Small pale worm, 10 mm. 

 in length, about 40 segments. Chloragogen cells begin in 6, 

 transparent and delicate. Pharynx in 2-3, hearts in 8 and q ; 



igi2 Mar. I. 



