II, with 32 (28-40) muscle cell rows. Egg masses of mature female 

 beginning in setigers 14-16. 



REMARKS: _S. wellf leet ens is is similar to Brania gallagheri Perkins, 

 1981, from the east coast of Florida, but differs from the latter in 

 having a shorter proventr icle , unidentate inferior simple setae, and 

 gametes present more anteriorly. See Perkins, 1981:1084, 1086 for addi- 

 tional remarks. BLM-MAFLA specimens previously identified as Pionosyl - 

 lis sp. D are herein referred to Brania wellfleetensis. 



PREVIOUSLY REPORTED HABITAT: Low water to 10.3 m; sand, muddy bottoms 

 and sand flats, sand with algae; on Diopatra tubes. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Widespread in northeastern Gulf 

 (Figure 30-13); 10-106 m; coarse to fine-very fine sand, silty fine 

 sand. 

 DISTRIBUTION: Massachusetts, Gulf of Mexico. 



Brania swedmarki Gidholm, 1962 

 Figures 30-15, 16a-d 



Brania swedmarki Gidholm, 1962:256, fig. 3A-H. 

 Brania swedmarki — Perkins, 1981:1081. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2423C-7/76 (1 spec), 2423J-7/76 (1 spec), 2530E-1/76 (1 spec, 

 USNM 65666). 

 Supplementary Material: 



Flor ida--Hutchinson Island, St. Lucie County, 10.9 m, T. Perkins ID., 

 FSBC I 20673 (1 spec), USNM 60475 (2 spec). 

 DESCRIPTION: 



Length, to 2.5 mm (previously reported to 3 mm); width, 0.25 mm. Body 

 slender, minute, complete specimens with up to 25 setigers. Prostomium 

 rounded with six small eyes in open circular arrangement (Figure 30- 

 16a). Median antenna missing; lateral antennae cirriform, about as long 

 as palps. Palps shorter than prostomium, directed ventrally at sides, 

 fused dorsally over two-thirds their length. Nuchal organs as narrow 

 ciliated slits between prostomium and peristomium. Tentacular and dor- 

 sal cirri clavate. Dorsal cirri absent from setiger 2. Ventral cirri 

 digitiforni, shorter than parapodia. Anal cirri paired, long, cirriform 

 (Figure 30-16b). Superior simple seta smooth (Figure 30-16c), present 

 beginning on setigers 1-6. Composite falcigers numbering 4-6 per fasci- 

 cle, with blades similar in length, unidentate, minutely serrate (Figure 

 30-16d). Inferior simple seta slender, similar to superior simple seta, 

 present on posterior setigers. Pharynx extending to setiger 4, with 

 small dorsal tooth located about one-third way back. Proventricle 

 extending from setigers 1-4 to 6-7, with about 25 muscle cell rows. 

 REMARKS: B. swedmarki is newly reported from the Gulf of Mexico. 

 PREVIOUSLY REPORTED HABITAT: To 11 m; coarse, calcareous sand. 

 GULF OF MEXICO BLM-OCS OCCURRENCE: Two stations off northwestern Flori- 

 da (Figure 30-15); 19-41 m; medium sand, silty fine sand. 

 DISTRIBUTION: Roscoff, France; northwestern North Sea; east coast of 

 Florida; Gulf of Mexico. 



30-23 



