Annelida of the Bermudas. 613 



Haplosyllis Langerhans. 



Zeitsch. Wissenschaft. Zool., xxxii, p. 527, 1879. 



This group was made a subgenus of Syllis by Langerhs^ns, but it 

 seems to differ sufficiently from that genus to justify its generic 

 separation. 



The special character, mentioned by Langerhans, is the presence 

 of simple setae alone, on all the segments. " Setse all simple." In 

 our species the shortness and paucity of the setae are equally note- 

 worthy, for there are usually only one or two short setae, with a 

 single hooked aciculum, in each fascicle. The simple bidentate setae 

 have the structure and nearly the form of the stem or shaft of the 

 ordinary form of the compound setae of Syllis, indicating that they 

 are merely such setaa that have lost, or else have not developed, the 

 blade. They are unlike the bifid setae of Eusyllis inridula, which 

 seem to be formed by the consolidation of a short angular blade 

 with the shaft. 



Our species of Haplosyllis also have the edge of the oesophagus 

 denticulated, nearly as in Eusyllis. So that the group appears to 

 be allied to the latter more than to Syllis. 



The typical genus Syllis, as restricted by Langerhans, has sim- 

 ple setae anteriorly or medially and compound setae posteriorly. 

 Typosyllis has them all compound, or with compound ones on all the 

 segments, 



Haplosyllis cephalata, sp. nov. 



A small and rather stout species, appearing stouter anteriorly, 

 owing to the prominent head and unusually large palpi ; eyes small, 

 black ; a few longer anterior cirri; those on most of the body very 

 short, composed of few^ annuli ; setae simple, bidentate, very few ; 

 oesophagus rather short, with a median anterior tooth. 



Head thick and convex above, elliptical in outline, widest about 

 the middle, with a slight median lobe anteriorly ; posterior edge 

 slightly emarginate. Eyes unusualh^ small, round, black, arranged 

 in a trapeze ; the posterior pair are rather small and separated from 

 the anterior by a space equal to 3 or 4 times their diameter. 



Palpi very large, wider than the head, ovate, not excavate on the 

 inner margin, obtuse at the end ; the exposed part longer than the 

 head, scarcely divergent, but often strongly curved downward in 

 the preserved specimens, Avith their bases overlapping each other. 

 Tentacle and antennae long and slender, strongly beaded ; the ten- 

 tacle projects considerably beyond the ends of the palpi; the anten- 



