210 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



lar glands enormously developed, extending posteriorly to anterior 

 end of intestinal region. 



Habitat. — Glacier Bay, Alaska ; found under mussels on rocks 

 between tides. The worms are gregarious in their habits, and sev- 

 eral individuals were found knotted together in a seemingly inex- 

 tricable mass, and were imbedded in a vast amount of slime (Coe, 

 :01); Port Townsend, Washington (Griffin, '98). The present 

 known range of the species is therefore only fi'om Puget Sound to 

 southern Alaska. 



43. Emplectoneraa purpuratum, sp. nov. 

 PI. 17, figs. 107, 108; PI. 22, figs. 159, 160. 



Body long, much flattened dorso-ventrally, and ribbon-like 

 throughout ; head rather narrow ; posterior extremity slender. 



Length 25 cm. or more ; width about 3 mm. 



Color. — Original coloring and markings are apparently well 

 retained after preservation, although there are no notes as to color 

 in life. Dorsal surface purplish or purplish brown from closely 

 placed mottlings of pigment ; ventral surface gray or yellowish. 

 Body is paler anteriorly ; tip and sides of snout lack the brownish 

 mottlings and are of same color as ventral surface. The ])urplish 

 brown mottlings are strictly confined to dorsal surface and are so 

 thickly placed as to give a homogeneous color when seen without a 

 lens. From the dorsal side there is no indication of the light color 

 of ventral surface. 



Ocelli. — Numerous ocelli lie on each side of head and extend 

 forward to tip of snout, but their arrangement is difficult to deter- 

 mine owing to dark pigment of body. They are of larger size than 

 in most species of genus. 



Proboscis. — ^In one specimen there were three pouches of acces- 

 sory stylets, and in another two. Each had two stylets with some- 

 times an immature third. The stylets are without the swollen 

 heads so characteristic of E. hurgeri., but are especially remarkable 

 in being fluted longitudinally (PI. 17, figs. 107, 108 ; PI. 22, figs. 

 159, 160). This peculiarity is conspicuous both in the central stylet 

 and in the mature accessory stylets. 



Basis of central stylet not swollen posteriorly as in E. hurgeri., 



