52 EDWARD T. BROWNE. 
Famity ULMARIDAL.* 
DreLutmaris, Maas, 1908. 
Generic Character—Ulmaride with 16 rhopalia, 16 tentacles, and 32 marginal 
lobes, regularly alternating (with numerous radial canals, some branching and all 
anastomosing in a network at the periphery and communicating with a circular 
canal). 
DIPLULMARIS ANTARCTICA. 
(Plate VL) 
Diplulmaris antarctica, Maas, 1908, p. 9, Pl. IL., figs. 2, 3. 
Ulmaropsis drygalskit, Vanhoffen, 1908, p. 45, figs. 10-12. 
Ulmaropsis antarctica, Vanhoffen, 1909, Deutsche Siidpolar Exped. Vorwort, Bd. x. (Zool., Bd. ii.), p. v. 
This interesting Medusa was first described by Maas as a new genus and species, 
and his description is based upon two specimens collected by the French Antarctic 
expedition. A few months after the appearance of Maas’ report on the Meduse of the 
French expedition, Vanhéffen’s report on the Meduse of the German Antarctic 
expedition was published, and in it he described a new Medusa under the name of 
Ulmaropsis drygalskii, n.g. et u.sp. Messrs. Maas and Vanhdéffen soon recognised 
that both expeditions had collected specimens of this new Antarctic Medusa, and that 
they had described it under different names. This was, however, unavoidable, owing 
to the short interval of time between the publications of the two reports. 
Dr. Vanhéffen (1909) recognises Maas’ priority and proposes that the name Ulmaropsis 
antarctica should be used instead of Diplulmaris antarctica. Iam sorry that I cannot 
agree to Vanhoeffen’s proposed generic name, because it is directly opposed to the 
rules of nomenclature, which are very clear and definite on this point. The generic 
name Diplulmaris has priority over Ulmaropsis, just as the specific name antarctica 
has priority over drygalskii. The name Diplulmaris is quite valid and must be used. 
The ‘Discovery’ brought home twenty-six specimens of this species, and they 
nearly all belong to the ephyra and meta-ephyra stages; but three are certainly 
adults. 
There is also a single specimen in the ‘Southern Cross’ collection. It belongs to 
the meta-ephyra stage, and was taken at Cape Adare on 10th May, 1899. 
The Ephyra stage (Plate VI., figs. 1 and 2).—The smallest and youngest specimens 
of the series are between 4 and 5 mm. in diameter, and have the typical ephyra 
appearance. At this stage the ephyra has sixteen fairly long arms, each divided into 
two flat lobes, which in the adult become the marginal lobes of the umbrella, and each 
arm carries a rhopalium. There are thirty-two straight, unbranched, radial canals, 
sixteen of which run direct from the stomach to the rhopalia, and sixteen belong to 
* As Ulmaris is a name coined by Prof. Haeckel, and not of Greek origin, Ulmaride may be allowed to pass, 
but Diplulmaris is so shocking a hybrid that a protest must be entered. Ulmaropsis is, of course, as bad.—Ep. 
