﻿SIPUNCULID WORMS OF CALIFORNIA — FISHER 411 



The nephridia are relatively longer (40 mm.) than in Sato's figure, 

 reaching nearly to base of the retractors. Only 15 mm. of the left 

 nephridium remains in place; the terminal 25 mm. was floating free. 

 The ruptured end of each part was perfectly healed. 



Type locality. — Mutsu Bay, northern Honshu, Japan. 



Distribution. — Northeastern Honshu; Monterey Bay, Calif. 



Specimens examined. — As follows: 



Monterey Bay, Calif., 1 large specimen fn)ni shallow water, which evidently 

 lived in a cavity excavated by boring mollusks in gray shale, E. F. Ricketts. 



Northeast of Monterey, Calif., 15 to 20 fathoms, G. E. MacGinitie, 1 specimen. 



Albatross station 4496, 2.1 miles ofi' Santa Cruz, Calif., 10 fathoms, rocky bottom 

 with fine sand, 4 specimens. 



Remarks. — Sato (1937, p, 163) reported specimens from Takada, 

 Iwati Province, measuring upward of 180 mm, long and 18 mm. in 

 diameter. In Japan it is found between tide marks. 



DENDROSTOMUM ZOSTERICOLUM Chamberlin 



Figure 87, A; Plate 30, Figure 1; Plates 31, 32 



Dendrostorna zostericola Chamberlin, 1919, p. 30. — Peebles and Fox, 1933, 



p. 201, figs. 1-11. 

 Dendrostorna mytheca Chamberlin, 1919, p. 30. 



Diagnosis.- — ^Tentacles sLx, branching profusely, either one or both 

 dorsals usually smaller than the others; body long and slender, 

 usually broadest posteriorly, the posterior end rounded to bluntly 

 pointed; some specimens, especially those fixed in formalin and with 

 introvert retracted, may be just the opposite: broadest anteriorly, 

 slender and elongated posteriorly. Introvert relatively short, with 

 scattered tiny clavate papillae, which decrease in size toward broad, 

 smooth zone behind tentacles; no hooks on introvert; skin rather 

 smooth, the postanal region uniformly peppered with very tiny 

 brown glands, which in anal zone gradually lengthen into the papillae 

 of introvert; nephridia very long, opening close behind anus; dorsal 

 contractile vessel with 10 to 12 very long terminal branches. Related 

 to Dendrostomum pcruvianum Collin, 



Description.— This species is one of the long, cylindrical Den- 

 drostoma, in which the length increases over the breadth as the animal 

 grows to large size. The largest preserved specimen (Point Con- 

 ception) is 245 nmi. to base of tentacles; introvert (anus to base of 

 tentacles) 30 mm,; thickness of trunk, 10 mm. The introvert however 

 is contracted and unnaturally short. The more usual proportion of 

 the introvert to total length is about one-fifth, as in examples around 

 150 mm. in length. The bare zone at anterior end of the introvert 

 occupies one-fourth to one-third total length of latter, again depending 

 upon the condition of the specimen. 



The tentacles usually branch into two main stems near the base, 

 and continue to add branches with age, but the tentacles are often 



