234 THE AMPHINOMID/E, APHRODITID.T;, POLYNOIDyE, AND SIGALIONID^ 



Palpi long, subulate and smooth, springing from the ventral 

 surface of the prostomium, but fusing with the first foot. 



A pair of scoop-shaped ctenidia at the base. 



Elytra covering the dorsum, fringed. 



Noto and neuropodia of equal lengths. 



Segmental eminence at the base of each foot, and a ciliated 

 funnel-shaped process on the foot. 



A well-developed branchial process on every foot, and on the 

 dorsal ridge beneath it three T-shaped ciliated organs. 



Notopodial cha3ta3 long, stiff, finely tapered, and spinous. 



Neuropodial chsette, upper ones with simple tips, boldly spinous; 

 next come compound bristles at first, with a terminal region 

 of three segments, then with one joint, and at the ventral 

 edge with one to four joints, all with bidentate tips. They are 

 arranged in the foot after the outline of a horseshoe, in 

 transverse section. 



*S. BOA, Johnston. Size to 8 inches. 



Prostomium, with broad, crescentic depression on the anterior 

 border. Eyes four, antero-lateral in position ; the anterior, the 

 largest, are almost hidden by the ctenidia. 



S. ZETLANDIGA, Mclntosli. Size 2 inches and more (?). 

 Specimen fragmentary. Head unknown. 



f S. ATLANTICA, McIntosh. Size unknown. 



Prostomium divided into two lobes by a slight median depression. 

 Median tentacle subulate and with a terminal joint. Eyes four, 

 one behind the other in the middle of the anterior border of 

 each lobe. 



*S. LIMICOLA, Ehlers. Size 2 inches and more. 



Prostomium ovoid laterally, base of median tentacle large and 

 cylindrical (conical in spirit), eyes four, posterior just behind 

 base of median tentacle, the anterior usually concealed by 

 the ctenidia. 



S. Jeffreysii, Mcintosh. Size 2 inches (?). 



Prostomium broadly ovate, bearing a long median tentacle on a 

 short base. No eyes visible (in a preparation). 



■fS. MINOR, Pruvot and Racovitza. Size 2 inches (?). 



Prostomium resembling that of S. limicola, but with small processes 

 on the inner border of the ventral tentacular cirrus. In 

 ^S". limicola they are large. 



