288 ANNELIDA POLYCH.ETA ANDREWS. 



There seems to be great variability in the place of occurrence of the 

 first branchiie; some large specimens apparently belonging to this 

 species have no branchiae before the fortieth segment; in other cases 

 the branchije begin much sooner upon one side than upon the other. 



Large individuals are occasionally found in the sand on Bird Shoal, 

 Crab Point, Green Hock, etc. 



DRILONEREIS (Clpd.) Webster. 



Drilonereis longa \Vebster. 



Webster. Aunel. Cbfet. Virginian. Coast, pp. 40-41, PL vii, Figs. 84-S8 ; Annel. 

 Chset., Provincetown, p. 721. 



Common in sand, Bird Shoal and various localities. 



ARABELLA (Grube) Eblers. 

 Arabella opalina Verrill. 



Lumbriconereis opalina Verrill. Invert. An. Vineyard Sd., pp. 342, 594, PL xill, 



Figs. 69, 70. 

 Arabella opalina Verrill. Check List of Mar. Invert, of Atlantic Coast, p. 8 ; Nat. 



Hist, of Ft. Macon (Coues and Yarrow) ; Proc. Acad. Nat. Sci. Phila., 1878, p. 399; 



New England Annelida, part 1, PL iv, Figs. 4, 4a. 

 Arabella opalina Webster. Annel. Cbset. Virginian Coast, p. 42; Annel. Chset., 



Provincetown, p. 721 ; Annelida from Bermuda, p. 321. 



One of the most common forms met with in digging in muddy sand;> 

 occurring in great numbers in some of the quiet bays and creeks. 



STAUROCEPHALUS (Grube) Ehlers. 



Staurocephalus sociabllis W^ebster. 

 Annel. Chaet. Virginian Coast, pp. 43, 44, PL vil. Figs. 89-91. 



A few specimens were dredged near Green Rock in 1884, and again in 

 1885. 



Family GLYCERID^. 



EUGLYCERA Verrill. 



Euglycera dibranchiata Verrill. 



Glycera dibranehiala Eiilers. Die Borstenniirmer, p. 670, PL xxiv. Figs. 1, 10-28. 

 Rhijnchobohis dibrancJnatas Verrill. Invert. An. Vineyard Sd,, pp. 341, 596, PL x, 



Figs. 43, 44. 

 Ehynehobolus dibranchiatus Wehsteh. Annel. Chtet. Virginian Coast, p. 245; Annel. 



Chait. Provincetown, p. 723. 

 Enghjcera dibranchiata Verrill. New England Annelida, part 1, p. 296. 



Occurs everywhere on the various shoals, with the following species, 

 but perhaps less commonly than the latter. 



