174 Papers from the Department of Marine Biology. 
Linuche unguiculata var. aquila. 
Linerges aquila, HAmcKEL, 1880, Syst. der Medusen, p. 496. 
Linuche aquila, Mayer, 1910, Medusz of the World, vol. 3, p. 560, figs. 356 B and c. 
Linuche unguiculata, VANHOFFEN, 1913, Zoologischen Jahrbiichern, Suppl. 11, Heft 3, p. 429. 
This variety is widely distributed over the tropical Pacific and is closely 
related to the tropical Atlantic L. wnguiculata, with which it is identical in 
form and dimensions, being about 13 mm. high and 16 mm. wide. It has 
48 wart-like protuberances upon the subumbrella arranged in 2 rows instead 
of in 3, as is commonly the case in the Atlantic medusa. 8 of the subumbrella 
sacs in the variety aquila alternate with the gonads and 8 arise from the sides 
of the gonads themselves. Thus in the Pacific medusa we have two zones of 
Fig. 1.—A. Showing usual arrangement of subumbrella warts in Linuche unguiculata of the 
tropical Atlantic. 
B. Showing arrangement of subumbrella warts of the variety aquila of the tropical 
Pacific. 
C. Enlarged view of central portion of the subumbrella of the variety aquila, showing 
lips, gonads, and saccules. 
protuberances, an inner zone of 16 large sacs, and an outer of 32 small sub- 
umbrella saccules. The 16 large sacs lie in the mid-regions of the gonads, 
while the 32 small saccules lie at the zone of the outer ends of the gonads. 
In the Atlantic form, the areas of brown cells are commonly developed only 
centrifugal to the zone of gonads, while in the Pacific variety they occur 
between the gonads as well as beyond them. A marginal ring-canal is pre- 
sent. The Pacific variety is, however, found also in the Atlantic. 
Vast swarms of these medusz are found among the atolls of the Fiji and 
Paumotos Islands, and they extend to the coasts of Africa and to Queensland, 
Australia. They abound in Queensland in the spring months, in Fiji in De- 
cember, and at Singapore in April. I have studied a large collection of these 
