HYDROMEDUSAE, SIPHONOPHORES, AND CTENOPHORES. 281 



Hartlaub (1913), whom I follow here, though Mayer (1910) has ex- 

 panded it to include forms with solid marginal cirri as well as 

 tentacles, as Halitiara formosa Fewkes. The descriptions of the 

 various species which have been credited by different authors (Haeckel 

 1879, Mayer 1910, Hargitt 1905) to this genus are so insufficient that 

 it is not worth while to add anything here to the discussion of them 

 given by Hartlaub (1913, p. 251). As he points out, some of them 

 are really Sarsiids, only two, tetrcmema (Peron and Lesueur) 

 Haeckel, and haeckeli Hargitt, being undoubted Pandiids. That 

 Halitiara formosa is likewise a true Pandiid is proved not only by 

 its general structure, but by cross sections of its gonads which I have 

 myself examined. But in this species there are solid cirri on the 

 bell margin, as well as the four tentacles, and it therefore deserves a 

 separate genus. 



PROTIARA TROPICA Bigelow. 



Plate 39, figs. 1-4. 

 Protiara tropica Bigelow, 1912, p. 253. 



Protiara tropica — material examined. 



I have already (1912) described this specimen in such detail that I 

 need merely call attention to the figure showing the interradial 

 gonads in transverse section (pi. 39, fig. 2), the location of these 

 organs being the reason for classing the specimen as a pandiid rather 

 than a sarsiid. 



Genus LEUCKARTIARA Hartlaub 1913. 



Tiara 1 Lesson, 1843 (part). 

 Turris 1 Mayer, 1910 (part). 

 Clavula Mayer, 1910 (part). 



Hartlaub 's recent (1913) discussion of this genus leaves little to 

 add — I follow him in referring to it all Pandiids with eight or more 

 tentacles, in one series, with " mesenteries " and with gonads pri- 

 marily horseshoe-shaped, their concavities directed distally, their 

 arms transversely folded. The chief distinction between Leuchar- 

 tiara, Neoturris, and Pandea is the structure of the gonads (1909a, 

 Hartlaub, 1913). I may refer the reader to Hartlaub's discussion 

 of the complicated synonymy, only pointing out that he is undoubt- 

 edly correct in using the species name octona Fleming for the medusa 

 which most authors have called " Tiara pileata" the Medusa pileata 

 of Forksal being a Ncoturris (p. 284). 



1 Preoccupied for a mollusk. 



