276 BULLETIN OF THE 



mine the genus, it is hardly enough for the species. The nectocalyx resembles 

 closely that of G. auraiitiaca, Vogt.* 



Although Galeolaria is not recognized by some naturalists as a distinct genus 

 from Diphyes, the form of the nectocalices, the course of the gastrovascular 

 tubes, and especially the flap-like appendages to the inferior (posterior) swim- 

 ming-bell, are so characteristic that it i« here looked upon as a distinct genus. 



HYDROIDA. 

 Halitiara formosa, gen. nov. et sp, 



Plate IV. Fig. 3. 



The young of a new Tubularian medusa was taken by us at the Tortugas. 

 Generic characteristics are as follows : — 



The bell is tall with a small apical projection. Chymiferous tubes, four in 

 number, simple, broad, without lateral glands. There are four long tentacles 

 which correspond with the radial tubes, between each pair of which are three 

 small tentacles. Otocysts wanting. 



H. formosa, sp. nov. 



The bell is tall, its height being double the diameter. At its apex it bears 

 a slight apical protuberance. The surface of the bell is smooth, and its wall 

 thin and transparent. The proboscis (manubrium) is unpedunculated, and 

 hangs down about one third the depth of the bell cavity. The basal portion 

 is filled with spherical cells, which are probably ova. The lips are smooth and 

 without appendages. 



coast in the summer of 1880. Leuckart (Siphon, von Nizza, p. 33, note 1) speaks 

 of the same genus from the coast of Greenland. Jhyla, HaHstcmma, and AjMlemia 

 have not yet been taken in our waters. There is in the collection of the U. S. Fish 

 Commission for 1881 a mutilated fragment of the stem of a Physophore, which may 

 have belonged to an Apolcmia, and a new genus, Ifaliphijta, which is elsewhere 

 described. 



* The choice between the two generic names Galeolaria and Suculceolaria to 

 designate this medusa is purely arbitrary. Lesueur gave the former to the anterior, 

 the latter to the posterior nectocalyx of the same Diphyid. Vogt named the first 

 complete form of this medusa Epibulia aurantiaca (later also Galeolaria aurantiaca). 

 Epibulia must give place to either of the two previous names of Lesueur. The 

 specific name, Jiliformis, Delle Chiaje, adopted by Leuckart (Galeolaria fiJiformis), 

 although the oldest, is derived from a wrong identification. The specific name qiuid- 

 rivalvif adopted by Gegenbaur, Sars, Keferstein, and Ehlers, with others, from Lesueur 

 and Blainville (Actin. Zool. Atl., VL 6), has more in its favor, but the fragment to 

 which it is applied by Lesueur cannot be distinguished from those other bells which 

 bear the names biacida and mimtta. The oldest specific name applied to a Galeo- 

 laria the use of which leaves me no doubt of the animal intended, is that of auran- 

 tiaca by Vogt. To choose between it and quadrivalvis is very difficult. 



