BRITISH ANNELIDS. 



511 



into two geuera. OmtpJiis has pectiuate brauchi£e ; the otheis 

 Northia, is distinguished by the absence of these organs. This 

 latter genus, which was first published in this catalogue, is, we 

 believe, badly defined, as one of the diagnostic marks of Onuphis is 

 " branchiae single or combshaped." We entertain serious doubts as 

 to the correctness of the synonymic list. Of the two species of 

 Onuphis {Northia), we may remark that the description of the first 

 species, as given in the text, is by no means so elaborate as that 

 given originally by Dr. Johnston, in the 16th volume of the Annals 

 of Natural History ; but on comparing both with the description 

 given by O. F. Miiller, we find many points of discrepancy. Un- 

 fortunately, the want of uniformity in the nomenclature prevents ua 

 from being positive on several points. Dr. Johnston's Onuphis, in 

 his description given in the text, is convex on both dorsal and 

 ventral surfaces. Miiller's is '* supra convexum subtus planius- 

 culum ;" Dr. Johnston says, " occipital segment, without any appen- 

 dage." If this mean the peristomium, it is a mistake ; if it lefer 

 to the second somite, counting the head, fur the moment, as one, 

 it does not hold good so far as the drawing is concerned, for in fig. 

 2 we see the second somite with appendages. In Miiller's species 

 the " coUum" is "angustum et muticum," and the fig. tab. xviii. fig. 4 

 shows this. In Dr. Johnston's, the second somite (the neck) is 

 broader than the head. In the specimen first described by Dr. 

 Johnston the posterior somites were wanting, so that the character 

 *' anal segment with two styles," is simply borrowed from Miiller. 

 To the synonomy of the second species, O. conchilega, we may add, 

 even after reading the foot note, the O. Eschrichtii of Oersted. Of 

 LysidicB (not Zycidicd) we have 2 species, of Lumlrineris 1. 



Of the Nereidawe have Nereis, with eight species, and we doubt 

 not many more ; of Nereilepas one species, of Heteronereis five. Of the 

 Nephthyaceae, reduced to a subgenus of Nereida by Cams, we have 

 Nepthys with three species. Of the Grlycerea we have Glycera with six 

 species ; and Goniada with one. Of the Phyllodocea, Phyllodoce with 

 seven species. Of the Hesionea, Fsamathe, which Carus reduces to a 

 synonym of Cirrosyllis of Schmarda. We think it will be found on 

 examination that C. fusca of Johnston is not the G. jnmctata of 

 Miiller, unless indeed, as hinted by A. Agassiz, it turns out that the 

 curious diff'erence in the first fifteen somites is owiug to the one 

 beino- a ' parent stock' of the other. It is strange that this differ- 

 ence, though well figured on Plate xvi., is not alluded to in the text. 



