178 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



C. capensis (Day, 1963, p. 396), as Loandalia capensis. South Africa. 

 C. brevicirris (Rangarajan, 1984, p. 122), as Ancistargis brevicirris. South 

 India. 



Key to the Species of Cabira 



1. Lateral antennae lacking. Ventral cirri small, at tips of neuropodial lobes. 



Hooked notosetae begin on setiger 8. Integument papillated. Proboscis 



soft sac C. capensis 



With pair small lateral antennae. Ventral cirri small, below neuropodial lobes. 

 Integument smooth or with only few scattered papillae 2 



2. Neurosetae of 2 kinds, slender capillary and short, with slightly recurved tips. 



Hooked notosetae begin on setigers 6-8. Proboscis with numerous, conical, 



soft papillae C. brevicirris 



Neurosetae all similar, slender, capillary 3 



3. Hooked notosetae begin on setiger 7. Proboscis with longitudinal rows of 



spines basally C. incerta 



Hooked notosetae begin on setiger 6. Proboscis? C. pilargiformis 



Cabira incerta Webster, 1879, revised 



Figures 11, 12 



Cabira incerta Webster, 1879, p. 267, pi. 11, figs. 155-157.— Hartman, 1947, p. 510. 

 Ancistrosyllis incerta Fauvel, 1920, p. 211. 



Material examined: Chesapeake Bay off Rappahanock River, 

 37°32'N., 76°07'W., 7 fms., mud, July 21, 1961, :Marvin Wass, 

 collector, 5 specimens. 



Description: Length to 18 mm., width to 1.5 mm., segments to 54. 

 Body long, subcylindrical, flattened ventrally, arched dorsally, nar- 

 rowest anteriorly, with indistinct segmental bulges (more prominent 

 posteriorly) . Prostomium and tentacular segment fused, with paired 

 biarticulate palps consisting of large palpophores and small ventral 

 palpostyles, with numerous papillae concentrated on anterior tips 

 (= membranous expansions or thin plates covered with papillae of 

 Webster) ; with pair very short lateral antennae arising from swollen 

 bases or ceratophores indistinctly set off from prostomium. Tentacu- 

 lar segment achaetous, with 2 pairs of very short tentacular cutI. 



Parapodia small, indistinct, subbiramoiis. Notopodium ( = ven- 

 tral ramus of Webster) represented by very small notopodial lobe or 

 dorsal cirrus with internal notoaciculum, with stout emergent hooked 

 notoseta (= strong hooked ventral seta of Webster) beginning on 

 setiger 7 (setiger 6, according to Webster); sometimes with additional 

 hooked seta in process of formation internally, indicating probable 

 replacement of hooked setae (figs. 12a, b). Neuropodiimi (=dorsal 

 ramus of Webster) short, conical, with neuroacicuhmi, tip of which 

 sometmies projects slightly and few (2-4) similar neurosetae (= dorsal 

 setae of Webster) ; neurosetae simple, slender, delicate, tapering to 

 capillary tips; ventral cirri (=dorsal cirri of Webster) short, digitiform, 

 below neuropodial lobe, beginning on setiger 3. Pygidium short, 



