[15] OLIGOCH^TOLOGICAL RESEARCHES. 893 



TuBiPEX BoNNETi Clap. 1868. 



Syn. : TuhiftJC Bonneii. Claparede, Eechiirches Anatomiques, etc., p. 13. 



The laost cLaracteristic feature of this species is tlie vase-like form 

 of the oviduct, which latter is of about the same leu^th as the penis. 



Habitat. — E urope ; S witzerland. 



TUBIFEX CAMPANULATUS 71. sp. 

 [Pt. VIII, Fig. 7.] 



Nervous system. — The cephalic ganglion is longer than broad, and in 

 front considerably broader than behind, where the emargination is deep 

 and narrow (Fig. la). 



Generative system. — The penis is broadest at the middle, and from 

 there tapering toward both ends. The penis sheath is of the same form 

 as thepenis, only broader andlonger (Fig. 7c). The oviduct is bell-shaped, 

 the widest end being turned towards the exterior penis. The lengtli 

 of the o\dduct is only half that of the penis, but its width at its lower 

 end is nearly three times that of the ijenis (Fig. 7c). The exterior ovi- 

 duct is membrane-like, and surrounded by two large trunks of longitu- 

 dinal muscles, which connect the oviduct with the body wall. This ex- 

 terior oviduct is twice as long as the interior one (Fig. 76*). The recep- 

 tacle is bent in the shape of an S, with the upper end enlarged and sack- 

 like (Fig. Id). 



Spines. — The two prongs of the forked spines are of nearly the same 

 size, and the angle between them is less than a right angle. 



Length of the body about IS'"™. 



Habitat. — Europe, Sweden, Christianstad. 



Tubifex profundicola Verrill (American Journal of Science, 3d series, 

 vol. ii, p. i50, 1871) is evidently no tubifex at all, if the spines are 

 correctly described. Those of the ventral fascicles are said to be longer 

 than those of the dorsal ones. All the setae are hooked or forked — char- 

 acteristics which place the worm in or near the genus Limnodrilus. 



Gen. LIMNODRILUS Claparede, 1862. 



.Syx. : Liinnodriliis Claparede 1. c, p. 25, 1862. 



Nervous system. — The cephalic ganglion emarginated both in front and 

 behind. 



Generative systetn. — The lower end of the atrium is generally long and 

 7iarrow, and comparatively narrower than the corresponding parts of 

 Tuhifex and Ilyodrilus. 



The copulative organs are not suiTounded by spiral muscles; gen- 

 erally by longitudinal, seldom by circular ones. 



Intciiummt. — Only one kind of spines,- viz, forked spines. 



The i)rincipal characteristic of this genus is evidently the total ab- 

 sence of hair spines and fan-shaped spines. In other respects this genus 

 seems to resemtele Tubifex. It is, however, likely that when a larger 



