70 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Onuphis magna (Andrews) 



Diopatra magna Andrews, 1891, p. 121, pi. 2, figs. 1-7; 1891, pp. 286- 



287, pi. 14, figs. 14-20. 

 Treadwell, 1921, pp. 78-81, pi. 7, figs. 1-5, text figs. 279-287; Monro, 



1928, p. 89; 1933, p. 76; 1933, p. 257; Pearse, 1936, p. 181; 



Berkeley, 1939, pp. 336-337. 

 Collections. — 963-39 (1); Lemon Bay, Florida, shore (1); Beau- 

 fort, North Carolina, shore (1). 



Specimens from the type locality (Beaufort, North Carolina) are 

 large and robust, measure about 12 mm across; those from western Mexi- 

 co are much smaller. Ventral cirri are cirriform through 5 segments, 

 thereafter padlike. Composite hooded hooks are present through 5 seti- 

 gers. A single subacicular hook may be present from the seventeenth 

 setiger, where it replaces the setal fascicle. Simple acicular hooks are 

 lacking. This species has been made well known through studies by 

 Andrews and others (synonymy above). 



Distribution. — O. magna is known from Beaufort, North Carolina, 

 south through the West Indian region, on both sides of Panama, and 

 north to western Mexico. Its bathymetric range is intertidal to 25 fms. 



Onuphis parva Moore 



Moore, 1911, pp. 263-266, pi. 17, figs. 51-57, pi. 18, figs. 98, 99. 



Collections.— \229-A\ (about 8) ; 1236-41 (2) ; 1237-41 (2) ; 1256- 

 41 (3); 1267-41 (6); 1289-41 (about 14); 1290-41 (2); 1321-41 

 (about 15). 



This is a small, white or pale species, the prostomium rather more 

 prolonged behind the occipital tentacles than usual, as Moore (1911) 

 has already described. Ventral cirri are cirriform through 3 setigers, pad- 

 like thereafter. Branchiae are already present from the third setiger 

 (usually), less often from the second or fourth, with a single, small fila- 

 ment, and become larger, with more filaments posteriorly, so that by 

 parapodia 20 to 25 there are 9 or 10 filaments. The first 3 or 4 setigers 

 have composite, bidentate, hooded hooks, together with narrow, longer 

 bilimbate setae; farther back the hooks are entirely replaced by simple 

 limbate setae, including longer, narrower ones in the upper part of the 

 fascicle, and shorter, broader ones in the lower part. There are no com- 

 posite spinigers or stout, simple hooks in any parapodia, in so far as I 

 can determine. Subacicular hooks, distally bidentate, are present from 

 about the fourteenth setiger, number 2 in a parapodium, as typical of 

 the genus. 



