G74 THE MARINE ANNELIDES OF THE ORDER SERPULEA, 



EXPLANATION OF THE PLATES. 



Plate 31. 



Fig. 1. — Pseudohcemal system of Eupomatus eleijans from the ventral side 

 enlarged, a, ventral vessel ; It, dilatation of ventral branchial 

 vessel: c, common branchial vessel; d, head-lobe; e, branches of 

 ventral vessel ; /, plexus in collarette ; g, plexus in lateral mem- 

 brane ; n, tubiparous gland. 



Fig. 2. — Anterior relations of the pseudohaemal trunks of Eupomatus elegans, 

 seen obliquely from the left side, v.v., ventral vessel; v. v., dilata- 

 tion of ventral branchial vessel; d.s., dorsal sac; d.b.v., dorsal 

 branchial vessels ; c.b.v., common branchial vessel. 



Fig. 3. — Body of Eupomatus elegans, compressed. t g., tubiparous gland ; 

 ht., contractile dilatation of dorsal vessel. 



Fig. 4. — Head of Eupomatus elegans. 



Fig. 5. — Vermilia caespitosa, magnified. 



Fig. 6. — Anterior portion of the body of Serpida vasi/era, magnified. 



Fig. 7. — Head of Pomatoceros elaphus, magnified. 



Fig. 8. — Head of Sabella velata, magnified. 



Plate 32. 



Fig. 1. — Operculum of Vcmilia caespitosa, x 8. 



Fig. 2. — Operculum of Vermilia rosea, magnified, 



Fig. 3-5. — Spines of the latter, x44. 



Fig. 6. — Operculum of Serpula vasi/era. 



Fig. 7. — Ventral uncinus of Serpula vasi/era, x 400. 



Fig. 8. — Dorsal seta of Serpula vasi/era, x 325. 



Fig. 9. — Operculum of Pomatoceros elaphus, magnified. 



Fig. 10. — Abdominal dorsal seta of Pomatoceros elaphus. 



Fig. 11.— Operculum of Eupomatus elegans, x40, slightly compressed. 



Fig. 12. — Developing operculum of Eupomatus elegans, x40. 



