172 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



cirri, similar to dorsal cirri. Proboscis cylindrical, with muscular core 

 and thin transparent covering, with short papillae around opening. 

 With intestinal caeca. Integument with numerous papillae on dorsal 

 surface and cirri, with fewer papillae ventrally; papillae especially 

 long on dorsal cirri and notopodial lobes. 



Distribution: Gulf of Mexico (Florida, Texas). Intertidal to 5 fms. 



Ancistrosyllis hartmanae new species 



Figures 7, 8 



The species is based on a single specimen from Chesapeake Bay off 

 Kappahanock River, 37°32' N., 76°07' W. in 7 fms. in mud, July 21, 

 1961, M. Wass, collector, holotype USNM 30989. The species is 

 named for Olga Hartman, eminent worker on the polychaetes. 



Description: Length 25 mm., width 0.5 mm., segments 110. Body 

 long, threadlike, flattened dorsoventrally, tapering anteriorly and 

 posteriorly, parapodia deeply cut, appearing moniliform. Prosto- 

 mium small, bilobed, partially retractable within tentacular segment, 

 with paired biarticulate palps indistinctly set off from rest of prosto- 

 mium, with palpophores large, papillated and small palpostyles visible 

 ventrally, with pair of lateral antennae shorter than palps, with small 

 unpaired median antenna posteriorly on prostomium, partially hidden 

 by tentacular segment, with 2 deep-set eyes hidden by tentacular 

 segment. Tentacular segment indistinctly separated from prosto- 

 mium, achaetous, with 2 pairs of short subequal tentacular cirri, 

 lateral and ventrolateral; ventrally forms lower lip of mouth. Dorsal 

 cutI of first setiger similar to following. Parapodia subbiramous. 

 Notopodial lobe low, inflated, with internal notoaciculum curving 

 distally, with short digitiform dorsal cirrus shorter than neuropodial 

 lobe; with stout emergent hooked acicular setae beginning on setiger 

 3. Neuropodium short, rounded, with retractile conical nem-oacicular 

 lobe, with bundle of about 5 neurosetae. Neurosetae simple, variable 

 in length, longest ones smooth, tapering to fine tips, shorter ones 

 finely spinous, all ending in slightly bent tips. Ventral cirri short, 

 subequal to dorsal cirri, beginning on setiger 3. Pygidium rounded, 

 with paired short subulate anal cirri. Proboscis not extended. An- 

 terior part of digestive tract (in setigers 3-6) looped; with segmental 

 intestinal caeca, 2 pairs per segment. Integument with scattered 

 minute papillae, on body and appendages. 



A. hartmanae may be separated from the other species of Ancistro- 

 syllis as indicated in the key on page 165. 



Distribution: Chesapeake Bay. In 7 fms. 



