224 THE AMPIIINOMID.E, APIIRODITID.K, POLYNOID.!-:, AND SIGALIONIDyE 



Peristomium bearing the first foot with long dorsal and ventral cirri, 



and the ventral cirrus of the next segment long. 

 Pharynx exsertile, muscular, cylindrical, with papillae round the margin ; 



horny jaws. 

 Parapodia, first foot bearing only a few minute chsette, conforming to 



the dorsal type. 

 Elytra, twelve to thirty-five or more ; segments carrying these devoid 



of cirri. 

 Segmental organs opening ventrally on papillae near the bases of the feet. 

 Dorsal chsette with more or less tapered simple tips, ventral cheetce 



with simple or bifid hooked tips. 

 Development by trochophores. 



SYNOPSIS OF GENERA. 

 Twelve elytra. 



Lepidonotus, Leach. 



Prostomium produced into the bases of the tentacles. 

 Fifteen elytra, covering the body entirely. 



Prostomium produced into the bases of the tentacles. 



Malmgrenia, Mcintosh. 



Tentacles, palps, and cirri smooth. 



Eyes large, lateral, nearly forming a square. 



Lateral tentacles arise underneath the base of the median. 



Gattyana, Mcintosh. 



Tentacles and cirri densely covered with long cilia. 

 Elytra smooth to the naked eye, posterior and external margin 

 with long cilia, segmental papillae long. 



Harmothoe, Kiiiberg, char. em. 



Posterior, pair of eyes, dorsal, anterior ventral, or on the extreme 



margin. Not always visible from the dorsum. 

 Segmental papillae long. 



Dorsal chieta, well-marked spinous rows, smooth tips. 

 Ventral chaette, simple-hooked tips, superiorly and inferiorly, 



median bifid. 



Antinoe, Kinberg. 



Eyes as in Harmothoe. 



Elytra, surface spinous, margin with short cilia. 

 Dorsal cha2tce, long and tapering, well-marked spinous rows. 

 Ventral cha^tae, long and slender, with elongated spinous regions 

 and hair-like tips. 



