BY WILLIAM A. HASWELL, M.A., B.SC. 675 



Plate 33. 



Fig. 1-2. — Varietal forms of the operculum of Eupomatus elegans. 



Fig. 3. — Ventral uncinus of Eupomatus elegans. 



Fig. 4-5. — Dorsal seta; of the first segment of Eupomatus elegans, x 400. 



Fig. 6. — Dorsal seta of Eupomatus elegans, x400. 



Fig. 7. — Salmacina australis? x 70. 



Fig. 8. -Budding Salmacina. a, developing branchiae of bud ; b, anal 



appendages ; c, intestine of parent. 

 Fig. 9. — Thoracic dorsal seta of Salmacina australis, x 400. 

 Fig. 10. — Abdominal dorsal seta of Salmacina australis, x400. 

 Fig. 11. — Dorsal seta of first thoracic segment of Salmacina australis, x 400. 



Plate 34. 

 Fig. 1. — Dorsal seta of Sabella velata, x 325. 

 Fig. 2. — Dorsal seta of first segment of Sabella velata, x 325. 

 Fig. 3. — Dorsal seta of Sabella velata, x 325. 

 Fig. 4. — Ventral uncinus of Sabdla velata, x 325, 

 Fig. 5. — Transverse section of branchial vessel of Vermilia ; a.a., stalked 



corpuscles ; b.b., free corpuscles. 

 Fig. 6. — Segmental organ of female Eupomatus elegans from the ventral side 



under slight compression, a, external orifice ; b, clump of ova. 

 Fig. 7. — Tubiparous gland of Eupomatus elegans. a, common excretory duct ; 



b, sac of the gland. 

 Pig. 8. — Oblique section of the tubiparous gland of Eupomatus elegans, x 400. 

 Fig. 9. — Transverse section of the same. 



Plate 35. 



Fig. 1. — Transverse section of the thorax of Eupomatus elegans. t,g„ tubi- 

 parous gland; n.c, nerve cords; v. v., ventral vessel ; d.v., dorsal 

 vessel. 



Fig. 2. — Transverse section of the thorax of Pomatoceros elaphus ; letters as 

 in the preceding ; l.v-, lateral vessels. 



Fig. 3. — Transverse section of common duct of tubiparous gland of 

 Pomatoceros elaphus, near the external orifice, x 325. a, granular 

 epithelium of the interior of the duct ; b, hypoderm ; c, cuticle ; 

 d, pseudohsemal vessel. 



Fig. 4. — Epithelium of the tubiparous gland of Pomatoceros elaphus, x 325. 



