BRITISH AHNELID8. 513 



cies was described in the same volume of the Annals as above 

 referred to. It is not mentioned in the text or appendix. 



II. First segment, with tufts of bristles. In this section there 

 are four genera — distinguished by the number of their antennae — 

 which number from three to four. None are native. 

 B. Syllidea without Palpi. 



I. Elongated cirri from all the segments. 



1. Cirri filiform. 



AmblyosyUis, Grube. 



2. Cirri club-shaped. 



a with three antennae. 



Myrianida, M. Edwards. M. ? pinnigera. 

 b with four antennsB. 

 Eucerastes, Ehlers. 

 * II. Only the first segment has elongated cirri. 



1. The first, second and third segments with long cirri. 



Proceraea, JEhlers. 



2. The first and second segments wdth long cirri. 



Autolytus, Grule. A. prolifer. This species 



is included under the genus Si/Uis. We should have expected to have 

 had its synonymy corrected in the Appendix, from the researches of 

 A. Agassiz. The following amended list of synonyms we take from 

 Ehlers, abridging the references. 



Autolytus prolifer, Gruhe. 



Nereis prolifera, O. F. Muller. 



Syllis prolifera, Johnston. 

 ^ Nereis corniculata, 0. F. Muller. 



Diproceraea corniculata, Grube. 



Crithidia thalassina, Gosse. 



Polybostrichus Miillerii, Keferstein. 

 ^ Sacconereis helgolandica, M. Muller. 

 Mr. Gosse' 8 new^ genus and species which, through the researches 

 of Mr. A. Agassiz noticed in our last number, has proved to be but a 

 stage of Autolytus prolifer, should have been noticed in a supplement 

 which purports to give the additional species found since Dr. John- 

 ston's death. But we content ourselves once for all by saying that 

 this has not been done, and while we in this review record all the 

 additional species that for the moment occur to us, yet it is pretty 

 certain that several will escape our notice. This will be of the less 

 consequence, as the newly projected " Eecord of Zoological Litera- 



