ÔO AET. 8. — T. TKEDA I THREE NEW AND 



tlie inner surface of the body-wall as slightly elevated, narrow 

 ridges or thickenings of the longitudinal muscular layer. In the 

 ten zones separated from one another by the above lines, the 

 circular muscle fibers form more or less regularly arranged trans- 

 verse bundles. The basal parts of the muscular sheath of the 

 ventral hooks are provided with numerous radial muscles, but 

 there exists no interbasal muscle. 



The entire alimentary canal, when stretched out straight, 

 may be 210 cm. long in a large specimen. It pursues a complex 

 and tortuous, but to a certain extent definite, course (fig. 49). 

 The manner of its winding resembles that of many other Echiur- 

 oids, especially of Echiurus unicinclus to my knowledge. As in 

 this species, the entire canal is fixed to the body-wall by means 

 of narrow muscular strands only, which are very numerous and 

 of which the points of both origin and insertion are not in a 

 straight continuous row but are distributed in different parts in 

 relation with the convolution of the canal. 



Here again, much difficulty is experienced in identifying the 

 parts of the alimentary canal with those that have been distin- 

 guished by writers in other species. I can separate the canal 

 into only three j^a^ts, viz., the pharynx, the œsophagus and the 

 intestine. 



The i^liarynx (fig. 49, ^j)A.) is a muscular tube, 4-5 cm. 

 long and in the empty state about 5 mm. wide. Its inner 

 surface is thrown into minute transverse folds. The posterior 

 end of it is marked by the presence of the heart (Ä^.), situated 

 on the dorsal side. -No lateral mesenteries are present, but 

 there exist some muscular strands that join the pharynx to the 

 body-wall. 



