(from Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America. Bull. Mus. comp. Zool. Harv.. 1-318)
Body broad and decidedly flattened, with thin lateral margins head broad; neck constricted, with pair of cirriform lateral append- ages; posterior extremity produced into a broad, finlike appendage. Mouth and proboscis aperture separate ; intestine straight, with lobed lateral diverticula; anus at end of caudal" fin." Musculature, blood vascular system, and position of lateral nerves much as in typical Hoplonemertes. Proboscis sheath extends nearly to posterior end of body; proboscis without stylets. Ocelli wanting. A cluster of peculiar organs, the nature of which is as yet undetermined, end in small papillae on ventral surface of each side of head. The worms are more or less distinctly pelagic and probably swim actively.Professor Heath has kindly sent me a brief account of the appearance and general anatomy of the species found in California. Some of the peculiarities of this form are as follows :
Shape of body as in Nectonemertes mirabilis, one individual having the following measurements: length 41 mm, greatest width 7.2 mm, width of head 5.3 mm, thickness of head 3.3 mm, greatest thickness of body region 2.5 mm, length of nuchal cirri 6 mm. Color in life bright scarlet; translucent. Mouth separate from proboscis pore; esophagus large, with glandular walls; intestinal caecum well developed, with lateral diverticula, the branches of which extend dorsally and inward nearly to median line; intestine with numerous branching diverticula, extending into caudal fin.
Three specimens were taken from the lines used by the Chinese in deep sea fishing near Monterey, California.
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