ANAITIDES LAMELLIFERA. 103 



SJ. Third normal notocirrus strongly narrowed dislad, ovate; first three pairs of notocirri 



not abruptly much smaller A. mucosa (Oersted). 



ee. Ventral cirri of middle region of body with apex of styles not acutely prolonged, short and 

 rather obtuse; styles of dorsal cirri not subquadrate. 

 /. Prostomium narrowed conically and subacutcly forward, only moderately incised behind, 



as wide as or wider than long A. lamellifera (Pallas). 



ff. Prostomium broadly rounded in front, not conically narrowed, and at least a little longer 



than wide, very deeply incised behind A. sancti josephi (Gravier). 



dd. Proboscis with at most seven or eight papillae in each middle lateral row. 



e. Styles of neurocirri of middle region of body distinctly pointed; styles of notocirri of same 



region drawn out to a point, not quadrate A. nculata (Ehlers). 



ee. Styles of neurocirri of middle region of body short and broad, distally blunt; dorsal cirri 



of this region quadrate, not distally prolonged A. maculala (Linnc). 



cc. Proboscis with twelve or more papillae in each middle lateral row. 



d. Twelve or thirteen papillae in each middle lateral row; styles of neurocirri of middle region 

 surpassing the neuropodia, and the free part of setae exceeding the latter in length. 



A. groerilamlica (Oersted). 



dd. Number of papillae in each middle lateral row at least eighteen; styles of neurocirri of middle 



region not attaining end of neuropodia, and the latter always longer than the free part 



of setae A. compsa, sp. nov. 



Anaitides lamellifera (Pallas). 



Nereis lamdlifera Pallas, Nova acta Petrop., 1788, 2, p. 232, pi. 5, fig. 11-17. 



Nereis lamelligera Gmelin, Syst. nat. ed. 13, 1791, 1, p. 6, 3128. 



Phyllodoce lamelligera Johnston, Ann. nat. hist., 1840, ser. 1, 4, p. 225, pi. 6, fig. 1-6 (in part); Ehlehs, 



Borstenwiirmer, 1864, p. 139; Johnston, Cat. annelids Brit, mus., 1865, p. 175; Fischli, Abh. 



Senck. naturf. gesellsch. Frankfurt-a-M., 1900, 26, p. 120; McIntosh, British annelids, 1908, 2, 



pt. 1, p. 76 (in part) ; Izuka, Journ. Coll. sci. Imper. univ. Tokyo, 1912, 30, p. 195 (in part) ; Fauvel, 



Result, campag. sci. Prince Monaco, 1914, 46, p. 111. 



Locality. Panama: Perico Island. Shore. Exped. 1904-05. One speci- 

 men. 



The single specimen referred to this species is very small, only about 20 

 mm. long exclusive of the protruded proboscis. It seems to have been broken 

 and is regenerating posteriorly; the regenerating piece is sharply set off from the 

 preceding portion. The number of somites remaining in front of the regenerat- 

 ing region is nearly sixty-eight. The color is light brown, lacking the conspicu- 

 ous coloration and markings present in typical large specimens as appears to be 

 the usual condition in dwarf specimens. The rows of papillae at the base of 

 the proboscis are six on each side as usual; these show a tendency to be irregular 

 and are not in all cases distinctly separated from each other. There are at 

 the apex of the proboscis eighteen large papillae encircUng the opening. The 

 cirri are as usual or very nearly so. 



It is evident that two or more distinct species have been confused by vari- 

 ous writers imder the name lamelligera, some of the specimens listed under it 

 being true members of Phyllodoce in the restricted sense, while others are clearly 



