306 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



their large size and small number (10-15) of tentacles in each bundle, 

 do not belong to a distinct variety. 



The greatest number of tentacles in any bundle of the present series 

 is fourteen; Agassiz figures 11-14, and Hartlaub has counted as many 

 as twenty-two in larger individuals from Heligoland. 



The oral tentacles agree in their branching with L. Agassiz' 

 figures. In most cases they branch dichotomously four times, 

 occasionally, however, five times. But this is not their final condi- 

 tion, since Hartlaub has observed instances in which branching took 

 place six and seven times. 



In the short squarish outline of the manubrium and in the fact that 

 this organ is situated on a short peduncle (pi. 31, fig. 2), as well as in 

 the thickness of the gelatinous substance of the bell, and in the broad- 

 ness of the radial canals, the specimens agree closely with the accounts 

 and figures of previous students. 



The color is that recorded by Hartlaub, the entoderm of the manu- 

 brium being reddish brown, the tentacular bulbs brownish red, the 

 ocelli black. 



B. superciliaris is a species of wide distribution. On the Atlantic 

 coast of America it is known to occur as far south as Woods Hole, 

 Massachusetts, and it is a common species thence northward to 

 Labrador, and perhaps to Greenland (Haeckel),and, as already noted, 

 it is known from Heligoland (Hartlaub). 



LIZZIA OCTOPUNCTATA (Sars). 



Plate 31, figs. 3-5. 



Cytxis octopunctata Sars, '35, p. 28, pi. 6, fig. 14. 

 Lizzia octo-punctata Forbes, '48, p. 64; pi. 12, fig. 13. 



The generic distinctions between the Bougainvilleidse with eight 

 tentacle groups have been well drawn by Maas (:05), who recognizes 

 two genera, Lizzia and BatJiJcea, separated by the structure of the 

 labial arms, as well as by the number of marginal tentacles in each 

 group. The various other genera founded by Haeckel, namely, 

 Lizusa, Lizzella, and Margellium were, as shown by Vanhoffen ('89), 

 founded upon young stages. 



Thanks to the studies of A. Agassiz ('65, "Lizzia grata") and 

 Browne ('96, "Margellium octojmiictatum^') the stages in growth of L. 

 octopunctata from the liberation of the medusa-bud to the adult, are 

 now well known, and to the latter author I refer the reader for its 

 complex synonymy ('96, p. 477). 



The collection contains a series of about 200 specimens of this 

 species from Fogo Island, Newfoundland, July 28, including both 

 budding and sexual phases, as well as numerous young stages. 



Sexual and budding phases are of about the same size, the largest 

 specimens of each being about 4 mm. high by 3.5 mm. in diameter. 



