[11] ANNELIDS OF PEOVINCETOWN, MASS. 709 



liis description. He regards it as having but six pairs of tentacular 

 cirri, and succeeds iu complicating matters by saying that the cirri of 

 the feet are retractile (''Pedes lougiusculi, cirri retractiles"), whereas 

 Savigny says that the tentacular cirri are retractile, a thing sufficiently 

 hard to believe. Langerhans (Zeitschrift fiir Wissenschaftliche Zoolo- 

 gie, p. 306, 1879) adopts Grube's view as to Hesione and Fallacia, and 

 refers Hesione ISteenstrupii Quatrefages to EaUmede Eathke ; but 

 Halimede is regarded by Malmgren as a synonym of Castalia (Sav.) 

 Sabs, though on what grounds, if Eathke's description is in any way 

 valid, it is hard to understand. The genera of Hesionidoe seem to be 

 badly confused. Our specimens differ from most of the described genera 

 in having the feet distinctly biramous, with two entirely distinct 

 bundles of setae. However, this is also the case with PodarTie Bhlers, 

 though expressly placed by Quatrefages among the uniramous forms. 



Our specimens, though differing somewhat from the diagnoses, seem 

 to belong to Resione Savigny as understood by Quatrefages ; and to 

 Halimede Eathke as understood by Langerhans ; while if regard be 

 had strictly to the original descriptions of these genera, they could 

 hardly be referred to either. 



Orsted, in his diagnosis of Castalia^ assigns to it maxillae, and figures 

 the maxillae of Castalia punctata (Annulatorum Danicorum Conspectus, 

 p. 23, fig. 65). It will be seen that similiar structures exist in our spe- 

 cies, but they do not seem to be hard parts. We could spare only one 

 specimen for this examination, but the i^arts in question appeared to 

 be neither chitinous nor calcareous. 



Family SYLLIDiE. 



SYLLIDES Orsted. 



We accept the genus Syllides on the authority of Professor Langer- 

 hans, never having seen the original description. Marion-Bobretzky 

 have described a species of the same genus, referring it to AnoplosyUis 

 CLAPARiiDE. Before seeing Laugerhans's work on the Syllidae we pro- 

 posed to refer our specimens to Anoplosyllis, though we were doubtful 

 as to the propriety of so doing. 



Syllides convoluta, n. sp. 



(Pl. II, Figs 12-16.) 



Head (fig. 12) with anterior and posterior margins slightly convex j 

 sides well rounded ; length to breadth as three to two ; eyes six, bright 

 red ; anterior pair very close to the anterior and lateral margins ; of 

 the posterior pairs, those in fi'ont are largest, and external, the eyes on 

 either side being almost in contact. 



The palpi are longer than the head ; coalesce along their inner third; 

 outer margin convex ; inner margin concave ; apex bluntly rounded. 



