VOL.11.] Anatomical Notes on Sutroa Alfcstris. 333 



Observe that the somites between XIX and XXXII are not 



shown. 



Fig. 2.— Copulatory papilla, showing the interior copulatory or- 

 gan— p.; the muscular wall— c. p.; the copulatory gland— gl.; 



and the atrium — atr. 

 pig^ 3.— The projected or inverted copulatory papilla extending 



outside of the body, 

 p.— External copulatory organ. 



gl. — Copulatory glands. 



set. — Setse. 



Fig, ^.—Anterior part of the worm .showing the filiform part of 



the cephaHc lobe or prostomium. 

 pig_ ^._A couple of setaj, showing two fully developed and twa 



reserve setse. 

 Fjg_ (5. — Albumen gland from somite VIII. 

 Fig. 7.— Spermathecal atrium with the branched spermathecae or 



seminal receptacles. 

 Fig. 5.— Interior opening of the spermatheca into the sperm- 



athecal sac. 



Plate 2. 



Fig. 9.— Cephalic and ventral gangUons. 



Fig'. 10. — Oviduct from somite X. 



Fig. //.— Ovisac or ovary, with two fully developed ova. 



Fig. 12. — A part of the prostata. 



Fig, jj — One of the cell agglomerations from the above. 



Fig. 7.^.— Egg capsule. The interior figure shows its natural size. 



Fig, 75-.— One of the testes from somite IX. 



Fig. 16.— r^ part of the albumen gland from somite VIII. 



Fig. 17. — One of the nephridia. 



E. p.— Exterior pore. _ 



gl. h.— Interior glandular head attached to the dissepiment of the 



anterior somite, 

 i. p.— Interior opening of the nephridium. 

 Figs. 18 to 2/.— Spermatophores in various stages of development. 



In 18 the tails are only partly grown, their lower screw-like 



parts alone projecting from the sac. Fig. 21 shows a full 



grown spermatophore. 

 Fig. 22.— k bundle of spermatozoa, being part of a spermatophore. 

 Fig. 23.—^ full grown and separated spermatozoop. 

 Fig. "23 b.— A partly grown spermatozoon. 



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