PUGET SOUND NEMERTEANS. 20T 



Metanenmertini. 



6. Emplectonema Stimpson, 1857. 



1873 Nemertes Mcintosh {jicc Cuvier 1817). 

 1873 Macronemertcs Verrill. 

 1890 Eimeinertes Vaillant. 



This genus is defined by Stimpson as follows : ** Corpus 

 longissimum subfiliforme, depressum, proteum. Caput subdis- 

 cretum, stricturis nullis, fovea longitudinali in utroque margine 

 antero-laterali. Ocelli plurimi." Later writers (including Mcin- 

 tosh, Vaillant, and Biirger) have added the following anatomical 

 characters to the definition. Mouth opens into the rhynchodeum; 

 proboscis very short ; rhynchocoelom restricted to anterior 

 third of body ; cerebral organs very small and far in front of 

 brain ; head gland but rarely reaches to brain. 



7. Emplectonema viride Stimpson, 1857. 



Stimpson gives the following description of this species in his 

 Prodromiis : ''Corpus depressum, lineare v. proteum, supra 

 viride, subtis album. Caput subdiscretum, marginibus albis ; 

 foveis elongatis bipartitis ; fronte emarginata. Ocellorum acervi 

 quattuor ; posteriores distincti, rotundati, ocellis confertis ; an- 

 teriores marginales juxta foveas, occellis sparsis. Long. 1 1 

 lat. 0.05 poll. Hab. in portu ' San Francisco ' littoral is inter 

 lapillos." 



The form here referred to E. viride occurs widely distributed 

 from Puget Sound to Alaska, and shows no local variations, 

 the same varieties being found in all localities visited. As a 

 general rule, however, the specimens from the more northern 

 latitudes are darker in hue. 



Length of largest specimen nearly i m., breadth 1-2 mm., 

 head spatulate, emarginate in front, not especially marked off 

 from body, not wider than body. 



Three color varieties are common: (i) A slender and 

 smaller form, very light olive green, (2) a much darker green 

 form which shows on head and anterior portion of body, a mid- 



