British Tubijicidx. By Rev. H. Friend. 279 



The main characteristic is to be found in the shape of the sperma- 

 thecse (tig. 51), which are sac-like l)odies with a distinct cap at the 

 narrow end at the external aperture. 



In mud from the River Lea, Tottenham, September 30, 1911, by 

 courtesy of Mr. C. Todd, with L. papillosus Fr. and others. The 

 setae, penis-sheath, speimathecie, and other points, readily dis- 

 tinguish it from all other known species. 



I have, in addition to the foregoing, notes on other species of 

 Limnodrilus, which, unfortunately, are not sufficient for tlie pur- 

 poses of this paper, though they serve to show that much more 

 remains to be done. A species taken at Runswick Bay, August 1, 

 1896, has usually 5 set* in front, with a very small upper tooth, 

 and two or three behind. My notes show enlarged hearts in seg- 

 ments 8 and 9 or 9 and 10, the hindmost being the larger. The 

 chloragogen cells commence in 6, and the girdle covers 11-12. No 

 penial setae were present, nor any penis-sheath. Curious sperm- 

 sacs were present, such as I have not noted elsewhere. If this 

 could be rediscovered it might show that the worms which are 

 destitute of a penis-sheath (including L. pwpillosus and L. trisetosus) 

 really belong to a new genus, corresponding in some measure with 

 Eisen's Campttodrilus.* It might be named Z. imvquidens, on ac- 

 count of the small outer tooth of the setae. 



II. Genus Clitellio Savigny. 

 1. Clitellio arenarius Mtiller. 



I have nothing to add to the accounts already given by Beddard 

 and others, except to say that I have found the worm in various 

 places on the English coast. 



III. Genus Rhyacodrilus Bretscher. 



Only two or at most three species are at present known. The 

 generic characterization is therefore embodied in that of the species. 

 In 1901, Revue Suisse de Zoologie, ix. p. 205, we find the following 

 description : — 



" Rhyacodrilus falcif or mis g. et sp. n. Lange 10 mm. Segmente 

 ca. 3 [error for 30 ?]. Farbe braunlich. Borsten iiberall doppel- 

 hakig, von der gewohnlichen Form, ventral zu 3-5, dorsal zu 2-4 

 per Biindel ; in 10 ventral jederseits eine grosse Geschlechtsborste, 

 die wohl zwei mal dicker und 1^ mal langer ist als die ilbrigen 

 Borsten ; ihr Schaft ist gerade. dick, etwas Linger als die sichel- 

 formig gebogene und gegen die Spitze hin verjiingte distale Partie 



(fig- 4). 



"Die Glirtel reicht von den Borsten in 9 bis zu denen in 11, 



* See note on L. papillosus, p. '276. 



