GLYCERA GOESI. 493 



(Ersted's Glycera Bouxii (1844 — 5) is a species requiring further investigation, for his 

 figure of the foot more resembles that of G. siphono stoma than that of G. Goesi. 



The Glycera fallax of De Quatrefages 1 is probably this species or G. alba, in which 

 the branchiae (ovaria, Kinberg) have assumed a globular form either from softening or 

 otherwise. The same explanation suffices for Mr. Parfitt's Glycera vesiculosa, n. s., in 

 which the author places the branchiae on the anterior aspect of the foot, as in the present 

 species. 



The Glycera branchialis of De Quatrefages 2 seems to be an allied form, the branchiae 

 springing from the anterior and upper part of the foot. His G. albicans 3 is a similar 

 form, but he describes the branchiae as arising from the upper and posterior part of the 

 foot. 



Ehlers (1868) states that the branchiae in G. unicornis spring from the anterior border 

 of the foot — just as occurs in that from St. Magnus Bay, only two processes characterize 

 the branchiae of that species. Moreover, he describes the branchiae as present on all the 

 feet between the twenty-third and last four, and mentions that some are bifid. He 

 observes that two kinds of papillae occur on the proboscis. 



Such, therefore, would agree with the Glycera Meckelii, And. & Edw., 4 in regard to the 

 branchiae. 



The Glycera decipiens of Marenzeller, 5 from the Bay of Miija in Japan, appears to 

 resemble this species very closely, both in regard to the position of the branchiae and the 

 structure of the feet. 



There is much in the structure of Glycera sagittarise procured off the Tetuaroa 

 Islands by the 'Challenger' 6 that agrees with this species, which may yet be found to 

 have a very wide distribution. It is true the branchiae commence only after the thirtieth 

 foot, but variation may occur in this respect. 



Marenzeller (1902) gives a careful criticism of the synonymy of this form, which he 

 considers to be the Glycera Bouxii of Audouin and Edwards. He shows that the lower 

 posterior lip is shorter than the upper, and that the branchiae (which are simple) are 

 retractile and on the anterior border of the foot, and that while the latter is also the con- 

 dition in G. unicornis, Savigny, the branchiae in that form are forked. 



Arwidsson (1897) describes the branchiae as occurring on segments 29 to 190, and 

 gives a sketch of the teeth of this form and of Glycera alba, the teeth of the latter having 

 a much broader base. 



This is not the Rhynchobolus siphonostoma of Delle Chiaje (1842) from Naples, a 

 species having a great development of the branchiae, which are bifid and conspicuous, but 

 it may be Malmgren's G. Bouxii, QErsted. 



1 ' Ann. Sc. nat.,' 3 e ser., t. xiv, p. 358 ; and ' Annel./ ii, p. 184, pi. ii, fig. 2. 



2 Op. cit., ii, p. 182. 



3 Op. cit., ii, p. 186 ; and ' Ann. Sc. nat./ 3 e ser., t. xiv, p. 358, 1850. 



4 ' Regne Anim., Annel./ pi. xiv, fig. 2. 



5 « Sudjap. Annel./ op. cit., p. 140, Taf. vi, fig. 3, 1879. 



6 < Annelids/ p. 346, pi. xlii, fig. 8, pi. xxii a, fig. 10 ; 1885. 



