ORBINIIDAE, APISTOBRANCHIDAE, 

 PARAONIDAE AND LONGOSOMIDAE 



(Plates 20-45, 1 chart) 

 By Olga Hartman 



ABSTRACT 



The polychaetous families ORBINIIDAE, APISTOBRANCHI- 

 DAE, PARAONIDAE and LONGOSOMIDAE are reviewed. The 

 ORBINIIDAE are distinguished for 74 species in nine genera and two 

 subgenera. Two new subfamilies, ORBINIINAE and PROTO- 

 ARICIINAE, are named. Califia, new genus, is erected for C. calida, 

 new species, from California. Other new species are Haploscoloplos 

 bifurcatus, Scoloplos (Leodamas) dendrobranchus and S. (L.) fimbria- 

 tes, from South Australia, Naineris uncinata from California, and 

 Naineris grubei australis, new subspecies, from South Australia. 



The APISTOBRANCHIDAE are known for three species in 

 three genera, and known only from the north Atlantic and Arctic 

 oceans. 



The PARAONIDAE are recognized for 28 species in three genera 

 and three subgenera. Aedicira is a new subgenus in Aricidea. New species 

 are Aricidea (Cirrophorus) aciculata, A. (C.) furcata, Paraonis multi- 

 branchiata, and P. gracilis oculata, new subspecies, from California. 

 LONGOSOMIDAE is known for a single species from California. 



Aricidea fauveli, new name for A. fragilis, sensu Fauvel, and per- 

 haps A. jeffreysii, sensu Fauvel, originates in the Mediterranean Sea. 

 Haploscoloplos alaskensis is newly referred to H. panamensis, Aricidea 

 heteroseta to A. suecica, A. longicornuta to A. uschakovi and Paraonis 

 filiformis to P. gracilis. 



A glossary of terms is given for ORBINIIDAE, and some species 

 are emended. 



ORBINIIDAE Hartman, 1942 



Introduction 



Representatives of the family Orbiniidae (=Ariciidae) are usually 

 regarded as the first family of the suborder Sedentaria although they are 

 freely moving in habit and construct no tube. They forage for food, 



[211] 



