Arabella /r/ro/or (Monlajfu, 1S04) 



Arabella mutans (Chamberlin, 1919) 



Arabella tricolor. - Fauvel, 1923: 438, Fig. 175 

 a-h. - Hartman. 1944a: 173; 1968: 789. Fig. 

 1-6. - Pettibone, 1963a: 269, Fig. 71 a-e. - 

 Day, 1967: 446, Fig. 17.18. i-m. 



Record!^. — North Carolina, intertidal to 80 m 

 (3,5,7,9,11, 13, 18,20,*). 



Z)/.sfr/6»f/o/(.— Cosmopolitan in temperateand 

 tropical seas extending from low tide to 83 m. 



C< tiotliri.r nnitaiis. - Chamberlin. 1919: 329. pi. 



61: Fig. 1-9. pi. 62: Fig. 1. 

 Arabella ii/iitaHs. - Hartman, 1944a: 173. - Day. 



1967: 446, Fig. 17.18. f-h. 



/?fY'or(/.^.— Off Beaufort in 5-160 m (*). 



Distribntioti. — Pacific coasts of tropical Amer- 

 ica; Easter Island; Galapagos Islands; Florida; 

 Cape Verde Islands; South Africa to tropical 

 East Africa; intertidal to 160 m. 



FAMILY DORVILLEIDAE 

 Key to genera and species 



1 Dorsal cirri ovoid, without cirrophores or internal acicula and 



arise from ends of parapodia 2 



1' Dorsal cirri elongate, mounted on cirrophores with internal 



acicula and arise from bases of parapodia {Dorvillea) 3 



2 Palps as mere i)apillae; antennae similar. No forked setae 



[Oplirijotroelia) 0. piierilis 



2' Palps elongate with terminal ovoid palpostyles. Superior forked 

 setae present (Protodorrillea). [A dorsal cirrus on setiger 1. 

 Antenna two-jointed] P. kefcrsteiin 



3 No dorsal cirrus on setiger 1 4 



3' A dorsal cirrus on .setiger 1. [Superior forked setae present 



with slightly unequal prongs] D. riidolphi 



4 No superior forked setae D. sociabilis 



4' Superior forked setae present with very unequal jirongs D. caeca 



Oph ryo t roch a pu e rilis 

 Claparede and Mecznikow, 1869 



Opin-ijotrocha pnerili^i. - Fauvel, 1923: 450, Fig. 

 180 a-h. - Hartman, 1944a: 191, pi. 15: Fig. 

 325-330; 1968: 823, Fig. 1-6. - Day. 1967: 

 452, Fig. 17.20. a-f. 



Records. — Beaufort, intertidal (11). 



Distribiftion. — Cosmopolitan in warm and 

 tropical seas occun-ing in aquaria and on pro- 

 tected .shores. 



Protodorrillea kefersteini (Mcintosh. 1869) 



Protodorrillea biarticiilata. Day, 1963a: 414, 

 Fig. 8 g-1; 1967: 4.52, Fig. 17.20. g-1. 



Protodorvillea kefersteini. - Hob.son, 1971: 542, 

 Fig. 8 a-d. 



Protodorrillea biarcticiilata (sic). - Day, Field, 

 and Montgomery. 1971: 122. 



Description. — Length 5 mm for 50-100 .seg- 

 ments. Prostomium rounded in front with an 

 annulus in front of antennae. Anterior pair of 

 eyes minute, often faded, posterior pair larger. 

 Antennae small, club-shaped, often weakly bi- 

 articulate. Palps long, wrinkled but terminal 

 palpostyles distinct and oval. Parapodia long 



64 



