SIGALIONIDAE 



I OS 



Remarks. I know no other Sigalion in which there are no compound bristles with 



single-jointed blades. 



Genus Leanira, Kinberg 



Body long and slender with numerous segments. There is a median tentacle which 

 usually has a ceratophore and a pair of ctenidia. The lateral tentacles are fused with the 

 first foot, which carries dorsal and ventral tentacular cirri, a bundle of simple bristles, 

 a cephalic scoop and a prebuccal lamella. There is a pair of long palps. Cirriform gills 

 are present on all segments except a few in the anterior region. The dorsal bristles are 

 simple capillaries with spiral whorls of teeth. The ventral bristles are compound 

 spinigers with canaliculate blades. 



Leanira quatrefagesi, Kinberg (Fig. 13). 



Kinberg, 1857, p. 30, pi. ix, fig. 42 a-e. 

 Ehlers, 1901, p. 59, pi. 5, fig. 8. 

 Monro, 1924, p. 46. 



Occurrence. St. WS 214 (i); WS 770 (i). 



Specific characters. Body long, rectangular in section. Neither of the specimens 

 is complete, but that from St. WS 770 is large and measures 185 mm. by 3 mm. without 

 the feet for 140 chaetigers. The head (Fig. 13) is rectangular, 

 broader than long, and towards the hinder border there is 

 some diffuse black pigment, which may be ocular pigment. 

 Beginning in the hinder third of the prostomium there is 

 a kind of raised ridge running forward to the end of the 

 head and continuous with the median tentacle. This I take 

 to be the ceratophore of the median tentacle fused with the 

 head. The median tentacle is spindle-shaped, shorter than 

 the head, and tapers to a fine tip. I see no ctenidia in con- 

 nection with the median tentacle. The lateral tentacles arise 

 from the dorsal surface of the first foot at the junction 

 between the foot and the head and are similar in form to 

 the median. The first foot also carries a dorsal cirrus, reaching 

 back to about the 4th chaetiger, a ventral cirrus about one- 

 third as long as the dorsal, and a bundle of long capillary 

 bristles. The palps are very long, reaching back well beyond 

 the loth chaetiger. At the base of the first pair of feet there 

 is a cephalic scoop and a prebuccal lamella. 



The elytra are tinged with orange-brown. They are without 

 cilia or papillae, being quite smooth. The cirriform gills 

 appear as small papillae on about the 20th chaetiger and reach their full development 

 about 10 chaetigers further back. 



The feet are figured both by Kinberg and by Ehlers. Neither of these authors record 

 parapodial ctenidia, and I failed to find any on the material obtained in the Straits of 



Fig. 13. Leanira quatrefagesi. 

 Head from above. 



