ECLIPIDRILID^ AND THEIR ANATOMY. 5 



uervetrunc, are as in Telmatodrilus connected by numerous anastomosing 

 commissures of the same width, or wider even than the cords themselves. 

 (PL II. fig. 8). The cephalic plexus forms a cephalic ganglion in size and 

 form very similar to that of Rhyachelmis^) and Ocnerodrilus^). The em- 

 argination of its frontal margine is rather slight, but the posterior lobes 

 are plain and projected. The nuclei and nucleoli of the cephalic ganglion 

 are large and distinct and rather closely packed. No lateral or second- 

 ary nerves are projected either from the ventral trunc or from the ce- 

 phalic ganglion. 



Generative system. The sexual organs are of two kinds viz : Ge- 

 nerative and Recejytive. 



The Generative organs are either 

 male, or tef^tes^ or 

 female, or ovaries. 

 The Receptive organs are also 

 male, or efferent ducts, or 

 female, or oviducts and 

 recejitacles. 

 The testes consist of two large sacklike and amorphous bodies, 

 situated in the segments Q*"" to 13"' inch, one on each side of the body, 

 and entirely covering the other sexual organs in the same segments. 

 (PL I. tig. 1. t). 



Similar testes are found both in Tuhificidœ and Lumbricididœ. In 

 the former family in Sinrosperma ferox^) in the latter in Rhynchelmis*) 

 and Phreatothrix^). 



The testes contain numerous cysts of spermatozoa, but no free 

 ones. Each such cyst consist of a globular body, attached to, or tap- 

 ering to a round wedge-shaped tail. This body is covered with smaller 

 globules full of a granulated, oily matter, among which cellnuclei res- 

 embling bodies are intermixed. The tail of this spermatozoa-cyst is 

 sometimes straight, sometimes bent, and is always covered by globules, 

 which are either partly separate, or which run together forming beauti- 

 fully elevated ridges. (PL I. fig. 7.). These ridges are either transversal, 

 spiral, or longitudinal, and separated by fields of equal size and regular 



') Zeitschr. W. Zoologie. Bd. XXVII, pag. 332. 



2) Nova Acta Reg. Soc. Sc. Ups. Ser. III. vol. X, N:o 10. 



ä) Bihang. K. Svenska Vet.Akad. Handl. Bd. 5. N. 16. 



^) Zeitschr. f. W. Zoologie. Bd. XXVII. p. 332. 



=) Zeitschr. f. W. Zoologie. Bd. XXVII. p. .541. 



