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The Anatomy of a new Species of Nectonemertes. 



By 



Mary E. CraTens and Harold Heath 



(Leland Stanford Jr. University, California). 



With plates 21—22. 



In 1893 Veerill described, under the name Nedonemertes 

 mirabilis, a remarkable nemertean taken by the U. S. F. C. Steamer 

 Albatross oif the eastern coast of the United States in water 

 636 — 1735 fath. in depth. This was made the type of a new 

 family, Nedonemertidae, with the following- characters: "Body broad 

 and decidedly flattened, with thin lateral margins ; head broad ; neck 

 constricted, with pair of cirriform lateral appendages; 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 Hoplo- 

 nemertea. Proboscis sheath extends nearly to posterior end of body; 

 proboscis without stylets. Ocelli wanting" (Coe, 1905). 



Eecently Joubin (1904) has described another species, N. gri- 

 maldii, taken by the Princesse- Alice (Expedition of the Prince of 

 Monaco) in the vicinity of the Azores. But one specimen was 

 secured and, as this was not sectioned, the examination related 

 merely to the more obvious features, such as the general shape of 

 the head and body, the size of the cirri and the appearance of the 

 fin. From our specimens it is at once apparent that little reliance 



