48 EDWARD T. BROWNE. 
SEM ZOSTOMATA. 
Famity CYANEIDA. ‘e 
DrsmoneMa, L. Agassiz, 1862. 
(sens. em. Maas, 1908.) 
Generic Character.—Cyaneide with eight rhopalia; with eight straight or nearly 
straight groups of tentacles, each group containing only a single row of tentacles ; 
with eight tentacular and sixteen rhopaliar lobes ; without radial muscles on the lobes. 
In 1862 L. Agassiz placed Chrysaora gaudichaudi, Lesson (1830), in a new 
genus called Desmonema, and at the same time he described Couthouyia pendula as a 
new genus and species. Prof. Haeckel (1880) emended the definition of the genus 
Desmonema and reduced Couthouyia to a synonym of it. Dr. Vanhéffen (1888) has 
also emended the generic definition of Desmonema and added a new species called 
Desmonema chierchianalum], on the ground that the earlier species were not recog- 
nisable owing to their imperfect descriptions. 
Until quite recently the above-mentioned species had only been récorded from the 
Magellanic area, and it was generally considered that they belonged to one genus, and 
that probably only one species really existed. The occurrence of a second species of 
Desmonema in the Magellanic area has still to be proved, as Desmonema chierchianum 
is the only one which has been adequately described and figured from that area. 
Dr. Vanhéffen (1908) in his report on the ‘Gauss’ Meduse has recorded 
Desmonema cherchianum from Kerguelen and Heard Islands, and also large tentacles of 
a Desmonema, and early stages from the ‘Gauss’ Winter Quarters of Kaiser Wilhelm IT. 
Land on the Antarctic continent. 
Dr. Maas (1908) in his report on the Meduse collected by the ‘ Francais’ 
Antarctic expedition records a Desmonema under the name of Couthouyia gaudichaudi, 
from Booth-Wandel Island, off Danco’s Land on the West Antarctic continent. From 
Maas’ description and figures there can be no doubt that his Couthouyia and the 
Desmonema in the ‘ Southern Cross’ collection belong to the same species. It must be 
clearly understood that there is no proof whatever, at present, that Desmonema 
(Couthouyia) gaudichaudi of Maas is identical with Desmonema (Chrysaora) gaudichaudi 
of Lesson. 
Dr. Maas (1906) has also given a brief description, without figures, of an early 
stage of a Medusa which he considers to be probably a young Couthouyia. This 
specimen was taken in October, 1898, by the ‘Belgica,’ in lat. 69° 59’S., long. 82° 
39' W., at a station which is south-west of the ‘Frangais’ station off Danco’s Land. 
According to Maas the specimen measured 15 mm. in diameter. It has sixteen 
marginal lobes which show the beginnings of branched canals, and eight tentacles and 
eight sense organs alternating with one another. This young Couthouyia is probably 
an early stage of Desmonema gaudichaudi, because Desmonema chierchianum of a similar 
