NO. 3 HARTMAN : ORBINIIDAE, APISTOBRANCHIDAE, PARAONIDAE 301 



they continue to the end of the body. Thoracic neuropodia at maximum 

 development have a broadly foliaceous postsetal lobe longest at its upper 

 edge, much like that of Naineris laevigata (see above). They have setae 

 that are almost all long and distally pointed, more or less sigmoid (S- 

 shaped) along their length, and denticulated. In a small inferiormost 

 position there are 8 to 12 much shorter, acicular uncini that are distally 

 blunt and only slightly curved and smooth along their free length; the 

 distal end has a closely fitting hyaline hood. 



Abdominal notopodia have long pointed setae and furcate setae. Ab- 

 dominal neuropodia have about 4 yellow, straight acicula that are dis- 

 tally blunt and slightly projecting from the neuropodial lobe, and a 

 slender fascicle of long pointed setae. 



The affinities of N. mutilata are with N. setosa (Verrill), in which 

 thoracic neuropodia have only pointed setae. 



Distribution. — Naineris mutilata is known only from Jamaica, West 

 Indies. 



Naineris uncinata, new species 

 Plate 38, figs. 1-8 



Naineris sp., Hartman 1955, p. 177. 



Collections.— 908-38 (1); 1330-41 (1); 1398-41 (many); 1496-42 

 (1, holotype) ; 2128-52 (6) ; 2153-52 (3) ; 2229-53 (3) ; 2311-53 (5) ; 

 2445-53 (1); 2646-54 (1); 2853-54 (1); another from Alitak Bay, 

 Alaska, shore ( 1 ) . 



Most individuals are fragmented in their posterior ends. Total 

 length of larger ones is about 40 mm or less; width in the thorax is 

 1.5 to 1.8 mm. The prostomium (fig. 1 ) is broadly truncate and has 

 no eyes (a juvenile individual from 2853-54, believed to be the same 

 species, has a broadly rounded prostomium with a pair of eyespots near 

 its posterior margin). Nuchal organs at the postectal margins of the 

 prostomium are transversely elongated, papillar processes. The proboscis, 

 everted in some, is spacious and somewhat lobed but not dendritically 

 branched. The first segment is a smooth ring, wider but shorter than 

 the prostomium. 



Branchiae are first present from the fifth (fig. 1) or sixth segment; 

 the first few pairs are small and erect; they enlarge gradually in thor- 

 acic segments, becoming larger and longer than their accompanying 

 postsetal lobes in abdominal segments (figs. 7, 8). All are simple, lingu- 

 late and conspicuously fimbriated along their lateral margins. 



