188 DK. BAIBD ON THE APHRODITACEAN ANNELIDES. 



Sp. 17. Halostdna malleata. 

 Folynoe malleata, Grube, Archivf. Naturg. 1855, p. 81. 

 Sah. Trieste, Qruhe. 



Sp. 18. Halostdna tuta. 

 Polynoe tuta, Grube, I. c. p. 82. 

 Sab. Sitka, Orube. 



Sp. 19. Halostdka yittata. 



Polynoe vittata, Grube, I c. p. 82. 3. 



Sah. Sitka, Grube. 



In the 'Zoological Proceedings' for April 1863, 1 described four 

 species of Lepidonotus, collected at Vancouver Island by J. K. 

 Lord, Esq., naturalist attached to the British North American 

 Boundary Commission. They were also figured for the Report 

 to be issued by that commission, which, however, has not yet 

 been published. 



Owing to a slight mutilation of some of the parts, the descrip- 

 tions of these species were in some respects slightly incorrect 

 and in others deficient in precision. They all belong to the sub- 

 generic group designated Salosydna by Kinberg ; and I take the 

 opportunity now afi'orded me of a more minute re-examination, to 

 give a somewhat more detailed accoxmt of them. This examina- 

 tion has also enabled me to alter one of the generic characters as 

 given by Kinberg. This author states distinctly the number of 

 elytra to be from fifteen to twenty-one. The interesting species, 

 however, S. Lordi, possesses thirty-five pairs of elytra ; and as in 

 other respects it agrees in generic characters with Salosydna, I 

 conclude that the exact number of elytra is not a certain charac- 

 ter, and only proves that Kinberg had not examined any species 

 which was furnished with a larger number than twenty-one. 



Sp. 20. Halostdka insignis. 



Lepidonotusinsignis, Baird, Proc. Zool. Soc. April 1863. 



This species is rather more than 3 inches long, and is nearly | 

 an inch in breadth, exclusive of the setae of the feet. The head 

 is small, and the anterior eyes are larger than the posterior. The 

 proboscis is large and wrinkled, and the jaws are of a reddish- 

 brown colour. The tentacle is rather club-shaped, blunt at the 

 tip, and ringed with black. The antennae, which are produced 

 from the anterior margin of the cephahc lobe, are a little shorter 

 than the tentacle, are slightly incrassated below the point, ringed 

 with black, and terminate in a fine white setaceous point. The 

 palpi are conical, white, setaceous at the extremity, and are very 



