ECHIUROID FAUNA OF NORTH PACIFIC — FISHER 495 



Spengei-, Johann Wixhelm. 



1912. t'ber den Hautmuskelschlauch gewisser Thalasseina-Arten und seine 

 Bedeutung fur die Systematik dieser Tiere. Verb. Deutsch. zool. 

 Ges., vol. 22, pp. 309-317. 

 Stephen, A. C. 



1941. The Echiuridae, Sipunculidae and Priapulidae collected by tbe ships 

 of the Discovery Committee during the years 1926-1937. Discovery 

 Reports, vol. 21, pp. 235-260, 2 pis. 

 Wesenberg-Lund, Elise. 



1934. The Scoresby Sound Committee's 2nd East Greenland Expedition in 

 1932 to King Christian IX's Land. Gephyreans and Annelids. 

 Medd. ora Gr0nland, vol. 104, No. 14, 38 pp., 9 figs. 

 Wilson, Chables Beanch. 



1900. Our North American echiurids. Biol. Bull., vol. 1, pp. 163-178, 1 pi. 



EXPLANATION OF PLATES 



[All figures were made by the vpriter directly from dissections or specimens.] 



Plate 28 

 Anelassoi-hynchus a'byssalis, new species 



1. Anterior complex of type, X 10. The foregut has been drawn to right to re- 



veal the setae and nephridia. (5\ B^, B\ dorsal, neurointestinal, and ventral 

 blood vessels, respectively ; C, stomach ; CF, ciliated funnel of nephrostome ; 

 G, gizzard ; /, small segment of intestine ; MI, interbasal muscle ; 2V, nephrid- 

 ium ; NC, nerve cord ; 0, esophagus ; P, pharynx ; S, seta ; SM, seta muscle 

 described in text ; VM, double ventral mesentery.) 



2. Seta of type, X 10. 



Plate 29 



Listriolohus hexamyotus, new species 



1. Seta from paratype, X 10. 



2. Anterior complex of type, X 10. The foreg-ut is drawn to right to show the 



nephridia and foreshortened setae. On left, a seta, 8', is drawn full length. 

 From where seta sheath meets body wall, a muscle, 8M, extends laterally, 

 one edge attached to body wall and the other free, the outer end near dorso- 

 lateral longitudinal muscle band, ML'. {B^-B^, dorsal, ring, and neurointes- 

 tinal blood vessels, respectively ; C, stomach ; CF, ciliated funnel of nephro- 

 stome ; O, gizzard ; /, presiphonal intestine, its ciliated groove dotted ; MI, 

 interbasal muscle ; ML, position of right ventrolateral muscle of body wall ; 

 ML', left dorsolateral muscle; N, nephridium ; NC, nerve cord; P, pharynx; 

 S, seta; S', a seta pressed flat to show length; Si'-, proximal end of siphon; 

 8M, dotted, lateral seta muscle described in text ; VM, ventral mesentery of 

 pharynx-esophagus. ) 



3. Side view of paratype, X 2. 



4. Skin papillae from near setae, much enlai'ged. 



Plate 30 

 Arhynchite califomvcus, new species 



1. Dissection of anterior complex of type, X 7. The anterior part of foregut is 

 in situ, the distal part drawn to right to show nephridia. The -f- beneath 



