150 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.22 



setigerous segments (Plate 16, fig. 1). The anterior end is plain, collar- 

 like except for a midventral cleft (Plate 16, fig. 2). The pygidium is 

 petaloid, terminating in 7 to 9 short, thick lobes arranged in a circlet 

 except for a middorsal groove (Plate 16, fig. 3) ; the anal pore is located 

 centrally within the circlet. 



Setal and uncinial ridges are pale ; the rest of the body is brownish and 

 closely mottled. The number of segments may vary from 34 to 43, with 

 the last 12 to 14 shorter than the others. The first four segments are 

 shorter than the fifth, which is longer than the first four together, and 

 the sixth one is the longest. The seventh is again shorter and the poste- 

 rior segments gradually decrease in length. 



The first 3 setigerous segments have notopodial fascicles only; from 

 the fourth, parapodia are biramous, with pointed setae in notopodia and 

 long handled uncini in neuropodia. The setal ridges are near the posterior 

 end of a segment. The last 10 to 15 segments are shorter than others and 

 their setae are prolonged as slender tufts. 



Uncini have a long cylindrical stem and terminate distally in 2 sharp 

 teeth at right angles to the shaft ; the distal or main tooth is larger than 

 thesubdistal one (Plate 16, fig. 4). 



Within the body cavity, the presence of pale ova indicates the maturity 

 of the specimens; a larger ovum measures 0.13 mm across. 



Myriochele is known for about 8 species (Hartman, 1959, p. 469) 

 a few of which come from deep water. M. heeri Malmgren has been 

 recorded off the Antilles in 2975 fms (Mcintosh, 1885, p. 410). M. 

 eurystoma Caullery (1944, p. 52) was named from off Makassar in a 

 range of depth from 32 to 1570 meters. M. pacifica Mcintosh (1885, 

 p. 413) was trawled in the middle Pacific Ocean in 2600 fms. This is 

 not to be confused with M. pacifica Annenkova (1937, p. 183) from 

 the northern part of the Japanese Sea in 45 meters. It differs from 

 Mcintosh's species in having a long, dorsal, non-retractile shield at its 

 anterior end, and is here renamed Myriochele annenkovae, new name. 



Myriochele pygidialis differs from each of these in having a posterior 

 end terminating in a circlet of processes; the body is long and slender 

 with as many as 43 segments; uncini have a different form. 



M. pygidialis has been recovered only from the outer series of basins 

 and may represent an abyssal species. 



