3G0 DR. BAIRD ON SEVERAL GENERA OE EUNICEA. 



number of both kinds (especially the pectinate setae) being 

 situated about the middle portion of the body. The two or three 

 anterior pairs of feet, and the two last pair, have the uncini or 

 booklets changed into the appearance of the compound setae of 

 JiJtmice, the falcate appendage, however, being as it were sol- 

 dered to the shaft and small — distinctly bidentate, as in Eunice. 

 The uncini are generally two in number to each foot ; but occa- 

 sionally there are three, and generally one is smaller than the 

 other. The caudal cirri show considerable variation also. In 

 general there are two ; but in one or two specimens examined there 

 were three distinct cirri, and in one specimen one of the two cirri 

 was divided, soon after it had sprung from the body, into two, or 

 became, as it were, dichotomous. 



From this variableness of the different portions of the body I 

 have assigned to it its specific name. 



Hah. St. Vincent's, West Indies, L. Guilding. 



The genus Syalincecia of Malmgren was first established by 

 Dr. Johnston, in his ' Catalogue of British Non-Parasitical Worms,' 

 in 1865, under the name of Nortlda. Malmgren changes the 

 name Norihia to Nothria, and derives it from the Grreek word 

 vi»6p6s, piger (slow ?). He says that Dr. Johnston must have 

 vsrritten it Nortlda in a mistake, unless he derived it from the 

 word North, in the same way as Dr. Gray formed his genus 

 Fromia (in Echinoderms) from the English preposition ^ow. I 

 suspect Dr. Johnston had no idea of deriving his genus NortTiia 

 from the English word North (point of the compass), but that it 

 was intended as a compliment to a person of the name of North. 



In 1847 Dr. Gray named a genus of Mollusca Northia, taking 

 as the type a species of Nassa {N. Northia), and so called it in 

 honour of a person of the name of North. As this genus of Mol- 

 lusks takes precedence by far in point of time of Johnston's genus 

 of Annelides, I think it advisable, though for a very different 

 reason from that given by Malmgren, to adopt this naturalist's 

 correction, and for the future write the name Nothria. Johnston 

 takes the species Onuphis tubicola as the type of his genus Northia, 

 and gives as his chief reason for forming the genus (separating it 

 from Onuphis) the fact that the two species referred to it are 

 destitute of pectinate branchiae, which exist in the species of the 

 genus Onuphis 'as adopted by Audouin and M. -Edwards, Grube, 

 i&c. Eor the Northia tuhicola of Johnston, Malmgren forms the 

 new genus Hyalincecia, while as the type of the genus Nothria he 



