72 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Composite, tridentate, hooded hooks (pi. 3, fig. 58) are present 

 through the first 6 setigers; thereafter they are replaced by only simple, 

 limbate setae; the superior ones are longer and slenderer than those be- 

 low. There are no composite spinigers or stout, simple hooks in any seg- 

 ments. Heavy, subacicular, bidentate hooded hooks (pi. 3, fig. 55) are 

 present from setiger 24, number 2 in a parapodium. Acicula typically 

 number 2 in a parapodium, are geniculate, and taper to sharp points (pi. 

 3, fig. 59). I can find none with rounded ends such as first shown (Berke- 

 ley, 1939). Pectinate setae are slightly oblique distally and have fine 

 teeth (pi. 3, fig. 60). A thirty-sixth parapodium appears to have only 

 about 3 such setae. 



This specimen is referred to O. zebra because of its greatly prolonged 

 anterior parapodia and cirri, the presence of cirriform ventral cirri 

 through a long, anterior region, the striking pigment pattern, and the 

 dentition of anterior hooded hooks. There are certain differences, how- 

 ever, which may have significance. Our specimen does have subacicular 

 hooks, present already from the twenty-fourth setiger, and here the 

 acicula taper to sharp points. 



Distribution. — Punta Gorda, Lower California (Berkeley) ; Guate- 

 mala, in 20 fms. 



Onuphis litoralis Monro 



Monro, 1933, pp. 78-80, fig. 33. 



Collection.— \220Al (1). 



An anterior piece consisting of 60 setigers measures 24 mm long; 

 there are extruded sperm balls, through rupture at fixation; hence this is 

 thought to be part of an adult male. The dorsum of segments is crossed 

 by broad, transverse, reddish-brown pigment bands, over half as wide as 

 the segment, chiefly on the posterior portion of the ring; the pigment 

 tends to be darkest within the parapodial bases and is more or less broken 

 up into a middle and a pair of lateral patches farther back. 



The tentacular ceratophores are proportionately somewhat longer 

 than first shown, with a few weak articulations and a longer distal arti- 

 cle, but the proportions of the tentacles are as originally shown. Bran- 

 chiae are first present from the eleventh setiger, with a short, slender fila- 

 ment. By the fourteenth the filament has attained the size of its dorsal 

 cirrus. (Branchiae were originally described as first present from the 

 seventeenth setiger.) A second filament makes its appearance at the 

 twenty-first setiger ; at about the thirty-fifth segment the maximum num- 

 ber of filaments is 3. 



