﻿SIPUNCULID WORMS OF CALIFORNIA — FISHER 419 



lighter, sometimes yellowish or grayish anteriorly; collar back of 

 tentacles dull reddish purple; tentacles brown, becoming pale and 

 translucent on the hundreds of ultimate tentacules, which at their base 

 are bright pale yellow. P^ormalin specimens are reddish gray or 

 brown; those preserved in alcohol are bleached sepia or sometimes 

 orange-brown. 



Young. — A specimen 26 mm. long, fully extended, from near the type 

 locality, has the form of the adult. It so much resembles the smaller 

 spineless young of Dendrostomum pyroides that a dissection was made 

 to determine the difTerences. F^ is attached to the ascending gut as in 

 fig. 87, B. The tentacles are less voluminous than in the 18-mm. 

 young pyroides. There are basically four tentacles, the extra two of 

 the adult arising from the growth of the inner branch of the two 

 dorsal tentacles. Young dyscritum lacks, in front of the spotted anal 

 zone, the area of transversely elongated glands of pyroides. The 

 nuchal organ in life was conspicuous light cadmium ^yellow, and the 

 tentacles light cadmium at base; general tone of skin, pale sepia with 

 a darker zone in anal region. 



Type. — U.S.N.M. No. 21221, N. W. Riser, 16 specimens, spawning 

 at end of February and early March 1948. 



Type locality. — Monterey Bay, Calif., intertidal, hi sand between 

 ledges of granite at Hopkins Marine Station, Pacific Grove. 



Distribution. — Point Conception to Crescent City, Calif., intertidal 

 to 10 fathoms. 



Specimens examined. — All from California: 



Crescent City, intertidal, June 3, 1911, W. F. Thompson, 32 specimens. 

 Dillon Beach, near Tomales Bay, Marin County, intertidal, in fissure of rocks 



with Pholadidea and Petricola cardiloides, June 2, 1941, D. F. Hoffmeister, 



1 specimen. 

 Dillon Beach, North Rocks, Dec. 11, 1947, R. J. Waidzonas, 3 specimens. 

 Pillar Point, Half Moon Bay, intertidal, March 12, 1911, W. F. Thompson, 



6 specimens. 

 Monterey Bay, intertidal, the type series; Albatross station 4496, off Santa Cruz, 



10 fathoms, fine gray sand and rocks, May 19, 1904, 6 specimens. 

 Point Conception, intertidal, July 14, 1916, Carl L. Hubbs, 1 specimen. 



Remarks. — A specimen collected February 24, 1948, by Dr. N. W. 

 Riser, was observed discharging sperm from one nephridiopore. 

 Later, when I dissected this specimen, I found eggs in the body 

 cavity. Dr. Riser collected a specimen on Alarch 20 that contained 

 sperm in one nephridium and eggs in the other. The gonad was 

 invisible. 



DENDROSTOMUM LISSUM, new species 



Plate 35 



Diagnosis. — A small, thick-set species, with short body; introvert 

 short, thick, devoid of spines and papillae; glands of skin minute, 



969586—52 4 



