34 THE OCEANIC HYDROZOA. 



are depicted, the hydrcecium hardly extends beyond the middle of the nectosac, it is made 

 to be as long, or even longer, in this. Nevertheless, in the ' Annales' (1827), a figure of a 

 species, which is supposed by the French voyagers themselves to be the same, is given 

 with the two parts in the ordinary proportion.^ I make no question that there is some 

 error here, and that D. dispar was the only Bvphyes seen by Quoy and Gaimard. 



The ' Beitriige zur Zoologie' of Meyen (' Nov. Acta,' t. xvi, Supp. 1, 1834) contains a long 

 and in some respects valuable description of a species of Bi^ilijjes, which he considers to be 

 new, and calls D. regularis ; without, however, entering into any comparison with the species 

 already described by Eschscholz and Quoy and Gaimard, or in any proper way defining the 

 characters of the supposed new species. In fact, B. regularis is nothing but B. dlspar, as an 

 attentive examination of the figures and description at once shows. Meyen has fallen into 

 an error in describing four cavities in the proximal nectocalyx instead of three, and he regards 

 the canals of the gonocalyx as muscles " intended by their contraction to facilitate the birth of 

 the ova." However, his account is the best that had been .up to that time given of the 

 anatomy of a Blpliycs. As I have hinted above, I have a strong suspicion that the Biphyes 

 turgida of Gegenbaur ('Beitriige,' p. 62) is no other than this species; but it is not figured, 

 and the description is very brief. 



DiPHYES APPENDICULATA. PI. I, fig. 2. 



D'lphyes uppendiculata, Eschscholz, 18.39. 

 -»- elongata, Hyndman, 1841. 



— Sieboldii, Kolliker, 1853. 



— gracilis, Gegenbaur, 1854. 



— acuminata, Leuckart, 1854, 



— KocJiii (?), Will, 1844. 



— — (?), Busch, 1851. 

 Muffgioea pyramidalis (?), idem. 

 Eudoxia Lessonii (Diphyozooid). 



The proximal nectocalyx is larger than the distal; and is acuminated at its apex. 

 The posterior contour is shghtly and evenly curved ; the anterior is a little concave below the 

 apex, then strongly convex, and finally retreats a little at its inferior boundary. The anterior 

 face presents three serrated ridges, which end below in but very shght points around the 

 aperture of the nectosac, which therefore appears to be placed in the midst of a truncated 

 inferior facet, occupying the anterior half of the inferior extremity of the organ. The pos- 

 terior half is produced for some distance beyond this, so that the hydrcecium opens far below 

 the nectosac. The aperture of the hydrcecium is as usual quadrate, and its anterior boundary 

 is formed by two overlapping quadrate plates. The inferior edges of its lateral walls are cut 



1 De Blainville improves on this (' Manuel d'Actinologie,' tab. v) by making the hydrcecium and 

 nectosac of equal size iu the unmagnified figure of the " Diphye de Bory," and very unequal (or in 

 their true relations, as I conceive) in the magnified one ! 



