Sentence:  Fabricia bikinii, n. sp. [...] The tentacular crown is composed of three pairs of symmetrical <WSD>radioles</WSD>; in addition there are shorter, entire, paired filamentous processes, or palpi, at the ventral end of the crown [...]. Each <WSD>radiole</WSD> has 6 to 8 pairs of slender filaments that arise along the basal half of the <WSD>radiole</WSD>; these filaments extend distally not quite as far as the <WSD>radioles</WSD> to which they are attached. 
Meaning of the word marked with <WSD> tags:  A heavily ciliated feather-like tentacle occuring in clusters on the crowns of certain tubeworms, especially those of the order Canalipalpata (the (fan-head worms)), used for feeding and respiration.