No. 2. — On some Medusa from Australia. By ALEXANDER 
AGASSIZ AND ALFRED GOLDSBOROUGH MAYER. 
Tun meduse described in the following paper were obtained while 
accompanying Mr. Agassiz during his recent visit to the Great Barrier 
Reef of Australia in April and May, 1896. Our course lay along the 
Queensland coast between the Great Barricr Reef and the mainland as 
far north as Lizard Island. Unfortunately, the season of the south- 
east Monsoon is far from favorable for collecting pelagic animals, as 
the winds blow a brisk gale almost incessantly and the water is much 
disturbed. 
The few hauls of the surface net were all very similar, and brought to 
light large numbers of Sagittee and Copepods, and a few Appendicularia, 
Doliolum, and Decapod larve. The only Cœlenterates found were 
several specimens of a Rhegmatodes, and a Mertensia. Two Dis- 
cophoræ were found during our cruise. One of these is a new species, 
for which we propose the name Desmonema rosea, and the other is 
Crambessa mosaica Haeckel. 
Desmonema rosea, nov. sp. 
Plate I. Fig. 1. 
The genus Desmonema was established by L. Agassiz.1 It contains Cyaneidæ 
with eight sense organs, and numerous tentacles which are arranged in eight 
bunches arising from the sub-umbrella. The tentacles of each of these bunches 
are arranged, one after the other, in a single row. The margin of the bell 
possesses eight principal lappets and sixteen to thirty-two secondary lappets. 
An oral view of Desmonema rosea is given in Plate I, Figure 1. The bell is 
rather flat, being about twice as broad as it is high. The eight primary lappets 
are separated from one another by deep clefts, which extend inwards for about 
a quarter of the distance from the margin of the bell towards the centre. There 
are thirty-two small, smoothly rounded, secondary lappets. 
The eight marginal sense organs are sunken in long narrow niches lying in 
the oral floor of the sub-umbrella. 
The tentacles are arranged in eight crescent-shaped rows, lying between and 
alternating with the eight primary lappets of the disk. There is but a single 
row of tentacles in each of these crescents. 
! Agassiz, L., 1862; Contrib. to Nat. Hist. of U. S., Vol. IV. p. 166. 
VOL. XXXII, — NO. 2, 
