Monostilifera

Tetrastemma signifer: Side view of head, showing position and extent of characteristic cephalic marking

Nemertopsis bivittata: head and side showing longitudinal stripe pattern

Poseidonemertes: detail of headCharacteristic two narrow eyespots at tip of head of Poseidonemertes

Plate3.8 Ventral surface of the same region in Amphiporus spectabilis.

Plate3.7 Dorsal aspect of the anterior region of Amphiporus spectabilis, De Quatref.

Plate3.2 Amphiporus spectabilis, De Quatrefages.

Emplectonema derjuginiEntire animal

Outline of anterior portion of the body showing brain and arrangement of the ocelli.(from Coe, W. R. (1901). Papers from the Harriman Alaska Expedition. XX. The nemerteans.. Proc. Wash. Acad. Sci.. 1-110.)

L-R: Head of male (dorsal view); Mature male specimen; Female with ripe ova; Head of femaleCoe, W. R. (1904). Nemerteans of the Pacific coast of North America. Part II. Harriman Alaska Series. 11, 111–220.

Dorsal view of head to show arrangement of ocelli.(from Coe, W. R. (1901). Papers from the Harriman Alaska Expedition. XX. The nemerteans.. Proc. Wash. Acad. Sci.. 1-110.)

posterolateral section showing testis (T), intestine (I), and portion of lateral nerve trunk (N), bar = 25 um.

Posterolateral section showing testis (T), intestine (I), and nearby gregarine infection (G), bar = 30 um

medial section showing ovary (o), intestine (I), bar = 40 um

medial section showing ovarian pore (arrows), ovary (o), intestine (I), bar = 20 um

Detail of parchment-like sheath, bar = 5 um.

Parchment-like sheath of juvenile worm (Sh), bar = 100 um

Anterior of holotype showing basis (B) and stylet (S), bar = 20 um

Anterior of juvenile worm with accessory stylet pouch showing several accessory stylets (arrows), bar = 30 um; inset from same..Anterior of juvenile worm with accessory stylet pouch showing several accessory stylets (arrows), bar = 30 um; inset from same juvenile from squash preparation, bar = 10 um

Ovicides julieae. Composite drawn from live observations on holotype and juveniles.

Juvenile worm encysted on pleopod setae of Hepatus pudibundus.

Stylet and basis (arrow) in a male worm

Filiform mucus sheath of adult worm

Male with rounded posterior end

Pointed posterior end of male, with seminal vesicle