38 NEPHTHYS INCISA. 



The species was first differentiated by Prof. Ehlers (1868), who had procured a 

 small example from England through Mr. W. Stimpson of the United States. 



Wiren (1883) considers this to be only a variety of Nephthys caeca, Fabr., just as he 

 joins to the same species Nephthys ciliata, 0. F. Miiller, N. longisetosa, (Ersted, and 

 N. emarginata, Malm. 



De St. Joseph (1894) describes a pair of minute eyes at the inferior border of the 

 first segment. He also points out the larger serrations at the flattened commencement 

 of the blade of the capillary bristles. He is of opinion that the Portelia rosea of 

 De Quatrefages may be this species. He distinguishes this form by the larger size of the 

 branchiae about the thirtieth segment. 



9. .Nephthys incisa, Malmgren, 1865. Plate LVII, figs. 19 and 20; Plate LXVII, fig. 4 

 —foot; Plate LXXVI, figs. 14 and 15— bristles. 



Specific Characters. — Head somewhat shield-shaped, slightly wider in the middle, and 

 marked by two pale lateral areas which map out the surface. Anterior and ventro-lateral 

 tentacles small and conical. Proboscis with twenty-two rows of minute papillae, and a 

 long dorsal and ventral cirrus. Foot with a rounded dorsal lamella extending nearly 

 to the tip of the organ. Small dorsal cirrus leaf -like and pointed, separated by a 

 shallow notch from the somewhat massive though short branchia, which has the tip 

 bent outward and forward. It diminishes and disappears posteriorly. Spinigerous lobe 

 small; hidden between the rows of bristles. Fillet guarding the base of the barred 

 bristles developed into a free flap superiorly and interiorly. Inferior division trifid, 

 the anterior fillet projecting most superiorly. Neither flap is much developed, and the 

 spinigerous lobe is conical. Bristles dark-brown, the anterior having the barred region 

 beyond the widest part, and the capillary forms being curved and minutely serrated. 



Synonyms. 



1853. Nephthys ingens, Stimpson. Mar. Invert. Gr. Manan, p. 33 (fide Yerrill ?) ; and N. circinata, 



n.s. idem., and ditto, Amer. J. Sc. and Arts, 1875, vol. ix, June, 

 p. 414. 



1865. „ incisa, Malmgren. Nord. Hafs-Annul., p. 105, Tab. xii, f. 21. 



1867. „ ., idem. Annul. Polych., p. 18. 



1868. „ „ M. Sars. Fortsatte Bemoerk., p. 10. 



1873. „ „ Kupffer. Exped. Ostsee, 'Pommerania/ p. 150 (Jahresb. Com. deutsch.). 

 „ „ „ Gr. O. Sars. Bid. Kundskab. Christ. Fauna, iii, p. 23. 



„ „ ingens, Yerrill. Amer. Journ. Sci. and Arts, vol. v, p. 103. 



1874. „ incisa, Malm. Op. cit., Goteb., p. 77. 



„ „ „ (or ingens), Smith and Harger. Trans. Conn. Acad., iii, pp. 16, 18, 22, and 39. 



,, „ ingens, Yerrill. Proc. Amer. Assoc. Sc, 1873, p. 347, pi. ii, fig. 2. 



„ „ „ idem. Peabody Acad. Sc, vi Rep., p. 60. 



