1134 DR. J. STEPHENSON ON THE OLIGOCH^TA OF THE 



Length 8-9 mm.; diameter -4 mm. Colour brownish. Seg- 

 ments 34-38. Prostomiiim bkuitly triangular, the triangle being 

 about equilateral. Head-pore between prostomium and first 

 segment ; no dorsal pores. 



Clitellum not well marked (or scarcely formed), xii.-xiii. ( = 2). 

 Setfe enchytrseine in form, tip fairly sharp. In front of the 

 clitellum both ventral and lateral bundles have three setse, 

 occasionally four ; behind the clitellum they have two only. 

 The hindmost septal glands are in segm. vi. 

 There are no salivary glands of the type of those of E. albidas, 

 but, as in the species of Lumbricillus, there are a pair of post- 

 pharyngeal bulbs. These are small, knob-like, ovoid cell-masses 

 immediately behind the pharynx, connected with the first part of 

 the oesophageal tube by solid conical cell-aggregates. The knobs 

 are separated from each other in the middle line by a muscular 

 strand. In other preparations of these same worms the struc- 

 tures are not so clearly seen — either there is actually some 

 variation or the plane of section is not so favourable. 

 Chloi'agogen cells begin scantily in segm. v. 

 The oesophagus remains narrow till past the genital segments ; 

 it begins to widen in xiii. and the intestine is fully established in 

 xiv. There are numerous sporozoan parasites in the epithelium 

 of the oesophagus. There are no chylus-cells in the alimentai-y 

 tract. 



The dorsal vessel originates in segm. xiii. The blood stains 

 slightly with eosin ; probably there was a small amount of 

 haemoglobin in it originally. 



Ooslomic corpuscles are present as irregular discs, staining 

 little, fusiform or OA'^al in shape, 32 /x in average length (the 

 limits being 30-40 /a), nucleated; but they are relatively few 

 in number. 



The nephridia (text-fig. 6) have a small narrow anteseptal 

 portion ; the postseptal portion is swollen out, shortly ovoid or 

 subspherical. The duct is long, relatively thick, and leaves the 

 outer side of the postseptal mass, passing backwards for some 

 distance and then downwards — even somewhat forwards in some 

 sections. 



The testes are bulky in the present specimens ; they are slightly 

 lobed in their distal portions. Some of the sexual cells ai-e 

 becoming metamorphosed into sperm-morulge and spermatozoa, 

 and these are bound together and to one of the lobes of the testis 

 by an apparently incomplete sac. These sacs appear to be 

 rupturii:tg, and so allowing their contents to escape. In one 

 specimen there is a mass of genital cells in segm. ix. 



The funnels are long and narrow, as much as 6-8 times as long 

 as broad. They ma,y push right through the septum into segm.x., 

 in which the anterior half of the funnel may thus be contained ; 

 or the anterior end may be reversed and push back septum 11/12 

 so as to form a sac, in which the anterior part of the funnel is 

 contained. The mouth of the funnel has a distinct lip. 



