Monostilifera

Diagram of body showing ocelli, brain lobes, alimentary canal (in dotted lines) and genital glands.Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

A large individual of the dark variety.Coe, 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.Coe, W. R. (1901). The Nemerteans of the Expedition. Proceedings of the Washington Academy of Sciences, Vol. 3, 1-110.

Plate4.16 Portion of a sperm-sac exhibiting a streaky and granular aspect from the varying nature of the contents

Plate4.14 Cephalic ganglia of Tetrastemma flavida

Plate3.9 Stylets of Tetrastemma flavida

Plate2.9 Structure of the stylet-region in Tetrastemma flavida

habitus(from Coe, W. R. (1901). Papers from the Harriman Alaska Expedition. XX. The nemerteans.. Proc. Wash. Acad. Sci.. 1-110.)

habitusCoe, W. R. (1904). Nemerteans of the Pacific coast of North America. Part II. Harriman Alaska Series. 11, 111–220.

Outline of anterior portion of body to show the arrangement of ocelli. Dorsal surface.Coe, W. R. (1901). The Nemerteans of the Expedition. Proceedings of the Washington Academy of Sciences, Vol. 3, 1-110.

HabitusCoe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

Stylet region of proboscis, showing slender styleta and basis and tubular middle chamber

Stylet of larger and smaller individuals, indicating spiral ridges

statocyst with spherical statolith

Outline of anterior portion of body showing statocysts (st) on ventral ganglia...outline of anterior portion of body showing statocysts (st) on ventral ganglia; other letters indicate: ct, cephalic blood lacunae; dg, dorsal ganglion; tn, lateral nerve cord; p, proboscis; PI, proboscis sheath

Plate3.1 Structure of the stylet-region of the proboscis of Prosorhochmus claparedii

Plate2.4 Prosorhochmus Claparedii, Keferrstein, and young.

Dorsal view of anterior portion of bodyCoe, W. R. (1901). The Nemerteans of the Expedition. Proceedings of the Washington Academy of Sciences, Vol. 3, 1-110.

Tetrastemma bilineatum: habitus

Tetrastemma quadrilineatum: habitus

Tetrastemma reticulatum: habitus

Tetrastemma reticulatum: Anterior portion of body of individual of the variety with confluent markings

Tetrastemma signifer: habitus

Tetrastemma signifer: Dorsal view of the head, showing typical form of cephalic marking