52 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.15 



Total length attains 50 to 61 mm; number of segments reaches 150 

 to 175. There is no distinct color pattern (preserved) but the dorsum 

 and dorsal cirri are diffused with light brown and the rest of the body 

 is yellowish brown. The anterior, uniramous portion extends through 

 26 or 27 segments; a small, inconspicuous notopodium marks the be- 

 ginning of the transition zone; the notopodium increases gradually in 

 size. 



The prostomium has the usual form; it consists of 8 or 9 rings; 

 the basal one is the longest. The 4 terminal antennae are small and 

 subequal in length to one another; they have clavate bases and minute, 

 distal articles. Eyes include one pair in the fleshy tissue of the basal 

 ring and a second pair in the distal ring. 



The proboscis terminates distally in 16 soft papillae. Within this 

 circlet there are 2 heavy, dark brown, dorsolateral macrognaths, each 

 with 4 or 5 distal teeth, increasing in size laterally. Micrognaths consist 

 of a dorsal arc of about 20 pieces and a short, ventral arc of 3, or 5 

 or only 2 quadricuspidate pieces; they are sometimes difficult to dis- 

 tinguish. 



Proboscidial organs are conspicuous throughout the length of the 

 proboscis except at the base, where the peristomial membrane is con- 

 tinuous. Those on the dorsal side are largest. All except those on area 

 IV have a distal pore. Those on area I are in 3 or 4 irregular rows and 

 all resemble one another ; they are small and semioval ; each has a large, 

 hard spine at the tip, directed orally (pi. 9, fig. 7). Those on area II 

 consist of 6 kinds, numbered II-l to II-6, beginning medially and ex- 

 tending laterally. Those of II-l are median and smallest; they are dis- 

 tally entire (fig. 1 ) or weakly bifid. Those of II-2 (fig. 2) and II-3 

 (fig. 3) are large, strong and falcate; they have an entire tip and a sub- 

 apical pore. Those of 1 1-4 (fig. 4), 5 (fig. 5) and 6 (fig. 6) are pro- 

 gressively smaller and have a tip that is entire or weakly bifid; the 

 last are especially notable for having a broad, embedded base. Pro- 

 boscidial organs on area III consist of 5 or 6 longitudinal rows of a 

 single kind (fig. 8) ; they are long in the transverse axis and have a 

 heavy spine directed ventrally. Those of area IV are disposed in 2 

 rows on each side; each is provided with 4 distal bosses (fig. 9) of 

 which 3 are much taller and stronger than the fourth ; these organs are 

 of further interest in that they increase considerably in size as one ap- 

 proaches the base of the proboscis, especially those of the inner row, so 

 that the 2 of a series may be very unequal in size. Organs on area V 

 are inconspicuous or absent ; area VI is also bare. 



