﻿SIPUNCULID WORMS OF CALIFORNIA — FISHER 393 



Color in life pale yellowish brown; tentacles whitish; skin slightly 

 translucent, that of introvert being iridescent. 

 TVpg.— U.S.N.M. No. 21220. 



Type locality. — Pacific Grove, Monterey Bay, Calif. 

 Specimens examined. — From California: 



Pacific Grove, Monterey Bay, Nov. 21 and Dec. 4, 1911 (eggs), W. F. Thompson. 

 Carmel Bay, low tide, in crevice of granite without sand, N. W. Riser, 1 specimen 

 containing eggs. 



Subgenus Phascolopsis Fisher 



Phascolopsis Fibhbr, 1950a, p. 550. (Type, Sipunculus gouldii Pourtalls.) 



Diagnosis. — Retractors 4; longitudinal muscle layer divided into 

 separate bundles; spindle muscle not attached to posterior end of 

 body; Golfingia gouldii (Pourtales) only species. 



Subgenus Mitosiphon Fisher 

 Mitosiphon Fisher, 1950a, p. 550. (Type, Phascolosoma hespera Chamberlin.) 



Diagnosis. — Retractors four; longitudinal muscle layer not divided 

 into bundles; nephridia bilobed; spindle muscle attached to posterior 

 end of body; introvert hooks with an accessory comb of spinelets at 

 base. 



Included species. — Golfingia hespera (Chamberlin), G. misakiana 

 (Ikeda). 



Remarks. — This small group differs from Golfingia, sensu stricto, in 

 having nephridia with a prominent anterior lobe, in combination 

 with a very long introvert and posteriorly anchored spindle muscle. 

 The hooks are unlike any found in Golfingia, in having at their base a 

 tiny comb of accessory teeth. The four retractors are united for 

 most of their length into a muscular column, which, when the intro- 

 vert is retracted, fills the body cavity with irregular coils. The 

 tentacles are in a single series surrounding the mouth, 



SYNOPSIS OF SPECIES OF SUBGENUS MITOSIPHON 



o'. Introvert 6 to 8 times length of trunk; coecum present; no fixing muscle; 

 tentacles 12 to 20; end of hook moderately curved; about 7 slender den- 

 ticles near base hespera (Chamberlin) (p. 393) 



a^. Introvert about four times length of trunk; coecum absent; one fixing muscle; 

 tentacles 8; end of hook abruptly curved, 4 or 5 coarser denticles near 

 base misakiana (Ikeda) 



GOLFINGIA HESPERA (Chamberlin) 



Plate 24, Figures 1-5 

 Phascolosoma hespera Chamberlin, 1919, p. 31. 



Diagnosis — A small, slender species with long filiform introvert and 

 slender, relatively short, fusiform body; 30 to 50 rings of very small 

 hooks; very small tentacle crown; four retractors free for only a short 

 distance; two large bilobed nephridia; no fixing muscles; intestinal 



