292 Transactions of the Society. 



the lower. Dorsal bundles of segments 2-15, equal toothed, pos- 

 sessing a middle tooth or comb. Capilliform setae present. Middle 

 and posterior portions of body with forked setae only, whose teeth 

 are equal. Male pore in segment 11, spermathecae opening in 10, 

 penial setae absent. Pulsating heart in segment 8. Penis some- 

 what long, with a glandular extension near the base. A long, 

 slender duct to the spermathecee." 



2. Tubifex tenipletoni Southern. 



Length 10-14 mm., pink in colour and of soft consistence. 

 Setae of anterior dorsal bundles 1-4, capilliform with 3-4 pectinates, 

 with fine intermediate teeth. Hair setaj very thin and flexible. 

 Ventral bundles with 3-4 forked setae, upper lip longer and thinner 

 than lower. No ventral setffi in 11, nor any genital seta?. Girdle of 

 granular cells 11-12. Front segments annulate. Pharynx to 5th 

 segment, chloragogen cells beginning in the 6th. Brain deeply 

 incised behind, with small median flap. Nephridia enveloped in 

 large cells ; hearts in 8-9. Spermathec* irregular sacs with well- 

 defined duct. Spermatophores present, and chitinous penis-sheath. 



1909. — Southern (Contributions, pp. 140-1). Phcenix Park, 

 Dublin ; Sutton Park, near Birmingham, March 1899 : discovered 

 but not published ; Welland, near Malvern, June 17, 1909, 



3. Tvhifex glohulatus sp. n. 



Capilliform setae usually 1 in each bundle dorsally, witli 3-4 

 pectinates, in which the inner teeth are very small and difficult to 

 find. In the ventral anterior bundles 3-4 forked seta?, teeth nearly 

 equal in segments 2-12. One forked seta in ventral bundles of 11, 

 with a globular chitinous penis-sheath, and striped muscular duct. 



1911. — Near Ashby-de-la-Zouch ; Tower Bridge, London. 



This does not exhaust my material, but, imperfect as the study 

 is, so much that is new and valuable has been already determined, 

 that it would answer no good end to withhold it from other workers 

 in this very interesting field. 



Addendum. — Since this paper was submitted to the Society my 

 researches have led to the discovery of another genus belonging to 

 tlie Tubificida3, and I have now to record two new species, which 

 I temporarily assign to the genus S/imuris. The genus is at once 

 distinguished from all others by the setae, which are Pachydrilus- 

 like, on which account great confusion has arisen. 



1. Sivnuris lineata Grube. Entirely distinct from Lunibricillus 

 (Pacltydrilus) lineatus O.F.M., which is an Enchytraeid, and occurs 



